BT2-series FUJI AIR CIRCUIT BREAKER - Fuji Electric

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Fuji Electric FA Components & Systems Co.,Ltd.
BT2-series
FUJI AIR CIRCUIT BREAKER
Instruction Manual
Please apply appropriate means to ensure that Instruction
Manual is delivered to the persons assigned with final
Responsibilities for maintenance of this equipment.

Ha Noi Office:
No. 95 - TT4, My Dinh Urban Area,
My Dinh, Nam Tu Liem, Hanoi.
Tel: (84 4) 3568 3740
Fax: (84 4) 3568 3741
Cambodia Office:
#140, Room 1-B, St430, Sangkat Toul
Tompuong II, Khan Chamkamon, PP.
Tel: 855 2322 3635
Fax: 855 2322 3645
Head Office:
No 88, Vinh Phu 40, Hoa Long,
Vinh Phu, Thuan An, Binh Duong.
Tel: (84 650) 37 37 619
Fax: (84 650) 37 37 620
1800 6547
THINK TOGETHER
Nhà phân phối thiết bị điện công nghiệp
hàng đầu Việt Nam
T

SAFETY NOTICES
Thank you for purchasing the FUJI BT2-series Air Circuit Breaker.
This chapter contains important safety information.
Be sure to carefully read these safety notices, instruction in this manual, and other documents
accompanying the Air Circuit Breaker (hereinafter referred to as the ACB) to familiarize yourself
with safe and correct procedures or practices before installing, operating, or servicing the ACB.
In this manual, safety notices are divided into “DANGER” and “CAUTION” according to
the hazard level:
DANGER
CAUTION
:A danger notice with this symbol indicates a potentially hazardous situation which,
if not avoided, could result in death or serious injury.
:A caution notice with this symbol indicates a potentially hazardous situation which,
if not avoided, may result in minor or moderate injury and/or property damage.
Note that failure to observe a caution notice could result in serious injury/damage in
some situations. Because safety notices contain important information, be sure to read and observe
■ Transportation Precaution
DANGER
● Never stand under the ACB that has been lifted or suspended by a lifter or lifting attachments.
The weight of the ACB may cause serious injury.
■ Installation Precaution
CAUTION
●
● Do not place the ACB in such an area that is subject to high temperatures, high humidity,
dusty air, corrosive gases, strong vibration and shock, or other unusual conditions. Mounting
the ACB in such an area could cause a fire or malfunction.
● Be careful to prevent foreign objects (such as debris, concrete powder, dust, chippings, and
iron powder) and oil or rainwater from entering the ACB. These materials inside the ACB
could cause a fire or malfunction.
● Prior to commencing any work on the ACB, open an upstream circuit breaker or the like to
isolate all sources of power/voltage. Otherwise, electric shock may result.
● Fix the draw-out cradle of the ACB firmly on a flat, level surface using mounting screws.
Otherwise, the draw-out operation may cause the breaker body or the draw-out cradle to fall,
resulting in damage to the ACB or personal injury.
● Take care not to deform or bend protrusions in the bottom face of the draw-out cradle when
fixing the draw-out cradle with mounting screws. Deformation of the protrusions may cause a
malfunction.
● Connect conductors (including screws) to the main circuit terminals in the specified area.
Otherwise, a short-circuit may result.
● When terminating conductors to the ACB, tighten terminal screws to the torque specified in
this manual. Otherwise, a fire could result.
● For 4-pole ACBs, be sure to connect a 3-phase, 4-wire neutral conductor to the N-phase pole
(on the right end). Otherwise, an overcurrent may hinder the ACB from tripping, resulting in a fire.
Electrical work must be done by competent persons.
■ Operation Precautions
DANGER
● Never touch live terminal parts. Doing so will result in electric shock.
● Do not leave the ACB body in the draw-out position. If the ACB body is accidentally dropped,
its weight may cause serious injury.
CAUTION
●Do not force down the charging handle after completion of manual charging operation. Doing so
may cause a malfunction.
●The permissible operating voltage of the spring charging motor is 85 to 110% of the rated ac
voltage or 75 to 110% of the rated dc voltage. Be sure to supply a voltage within the above

SAFETY NOTICES
■ OCR (Overcurrent Release) Handling Precautions
●OCR setting changes must be performed by competent persons.
●Use a small flatblade screwdriver with a torque of not more than 0.1 N·m or a force of not
more than 0.1 N when adjusting the setting switches (rotary step switches or slide switches). An
excessive torque or force may cause a malfunction.
CAUTION
■ Maintenance and Inspection Precautions
CAUTION
●ACB maintenance, inspection and parts replacement must be performed by competent persons.
●Do not touch ACB current carrying parts and its surrounding parts or structures after the ACB
trips open. Remaining heat may cause a burn.
●Prior to commencing any work on the ACB, open an upstream circuit breaker or the like to
isolate all sources of power/voltage from the main and control circuits. Otherwise, electric
shock may result.
●Take care to avoid adhesion of dust to main and control circuit contacts. Dust on the contacts
may result in a fire.
●Prior to commencing maintenance, inspection, or parts replacement, make sure that the closing
springs are released and the ACB is open. Otherwise, unintentional open/close operation may
lead to fingers or tools to be pinched by the open/close mechanism, resulting in injury.
●Retighten the terminal screws periodically to the specified torque. Otherwise, a fire could result.
● When grinding a contact tip, be careful to prevent grinding dust from entering the breaker
operating mechanism. Wipe the tip clean after grinding. Otherwise, a malfunction or fire could
result.
●Do not perform dielectric withstand tests under other conditions than specified. Doing so may
cause a malfunction.
●Be sure to reinstall the arc chamber if removed. Failure to do so or incorrect installation of the
arc chamber may result in a fire or burn.
●When charging the closing springs or performing open/close operation of the ACB with the arc
chamber, front cover and/or side covers removed during maintenance or inspection work, do not
touch parts other than those required for the above operation (charging handle, ON/OFF
buttons, moving core and the like). Doing so may cause fingers or tools to be pinched, resulting
in injury.
●When replacing an auxiliary, do not damage the control wire for the auxiliary or pinch the wire
between the auxiliary and the breaker body. Doing so may cause a malfunction.
ranges to the motor. Otherwise, a malfunction, burnout, or fire may result.
● Repeated open/close operation by the motor charging mechanism without pause should not
exceed 15 times. If repeated continuous open/close operation is inevitable, a pause of at least
20 minutes should be provided after the repetitions of 15 times. Otherwise, a spring charging
motor may be burnt out.
●Do not bring your hand or face close to arc gas vent of the arc chamber while the ACB is closed.
Otherwise, a burn may result from high-temperature arc gas blowing out of the arc gas vent
when the ACB trips open.
●If the ACB trips open automatically, remove the cause of tripping operation before re-closing
the ACB. Otherwise, a fire could result.
● If the ACB has the breaker fixing bolts, be sure to loose the fixing bolts before draw-out
operation. Otherwise, damage to the ACB may result.
●Make sure the draw-out cradle is secured with mounting screws before inserting or drawing out
the breaker body. Otherwise, the insertion or draw-out operation may cause the breaker body
or the draw-out cradle to fall, resulting in damage to the ACB or personal injury.
●When retracting the draw-out rail into the draw-out cradle, be sure to push the rail end. Do
not hold the hook pin, body stopper, or body stopper shaft. Doing so may cause your fingers to
be pinched, resulting in injury.
● Do not forcedly turn the draw-out handle clockwise when the breaker body is in the
“CONN.” position. Doing so may cause a malfunction.
● If the ACB has the breaker fixing bolts, make sure the bolts on both sides are securely
tightened before using the ACB. Loosened fixing bolts may cause a malfunction of the ACB, in
particular when it is installed in such an area that is subject to strong vibrations.

CONTENTS
1.0 General description
2.0 Acceptance
3.0 Storage, transportation and weight
4.0 Unpacking and notice
5.0 Installation
6.0 Electrical wiring
1.1 Applicable condition
1.2 Main features
1.3 General structure
1.4 Protection characteristic curve of intelligent controller
3.1 Storage
3.2 Transportation
3.3 Weight
4.1 Unpacking
4.2 Items to check before operation
5.1 Environment condition
5.2 Preparation
5.3 Installation of draw-out breaker
5.4 In of fixed breaker
6.1 Schematic diagram for secondary circuit terminals of BT2-1600 circuit breaker
6.2 Applied torque for connecting busbar and terminals
6.3 Grounding
6.4 Power loss and derating coefficient
6.5 Specification of the copper busbar wired in the primary circuit of draw-out breaker
stallation
1
1
1
2
4
11
11
11
12
14
14
15
15
15
16
16
16
17
17
17
17
11
19
18

6.6 Secondary circuit wiring diagram
7.1 Charging operation
7.2 On and off operation
7.3 Operation of draw-out breaker
7.4 Lock at the position of separated by safety padlock mechanism for the draw-out
Breaker socket
8.1 Setting and use of type L25intelligent controller
8.2 Setting and use of type M25, M26 and H26 intelligent controller
8.3
8.4
8.5
10.1 Checking and preparation
10.2 Trial operation
11.1 Maintenance
11.2 Examination and repair
11.3 R ccessories
13.1 Necessary accessories
13.2 Optional accessories
7.0 Operation
8.0 Setting and use of intelligent controller
9.0 Checking
10.0 Trial operation
11.0 Maintenance , examination and repair
12.0 Common fault and solution
13.0 Accessories
14.0 Outline dimensions and installation dimensions
“ ”
Characteristic setting and use of P25 and P26 controller
Communication function of H26, P25 and P26 controller
Other Function
eplacement of a
20
24
24
24
26
33
34
34
37
57
57
57
58
58
58
59
61
62
65
65
68
75
CONTENTS
54
54
55

1.0 GENERALDESCRIPTION
1.1 APPLICABLE CONDITION
According to the requirements of the lastest International Standard IEC 60947-2, Fuji
Electric FA Components & Systems Co.,Ltd presents the new generation of BT2 Series Intelligent
Air Circuit Breaker, which embraces the human-based design and convenient application and is
characteristic of all-intelligence, high-breaking capacity, isolation etc and which has shaped the
new image of new generation of circuit breakers.
BT2 Series Intelligent Air Circuit Breaker (hereinafter referred to as Circuit Breaker) is mainly
used to distribute electric power and protect the electric circuit and devices from over-load,
shortcircuit,under-voltage and grounding fault etc in the distribution system of AC50Hz/60Hz,
Rated Operating Voltage 440V、 690Vand 1000V, Rated Insulation Voltage 1000V, and Rated
Operating Current 6300A or below. The Circuit Breaker has introduced the intelligent controller
with accurate selective protection and multiple functions and especially suits for the distribution
system, in which the reliability of power supply needs to be improved and power failure should be
avoided. The Circuit Breakers, with Rated Operating Current 1000A and below, can take the role of
motor overload, short-circuit, under-voltage and grounding fault protections in the network of
AC50Hz/60Hz 440V and can also infrequently start a motor under normal conditions.
1.2 MAIN FEATURES
·1·
High performance, compact size
BT2 Series Circuit Breaker has five frames:1600, 2000, 2500, 4000 and 6300. BT2-1600,
which can be installed inside the switchgear cabinet of 400mm in width, is only 248mm in width.
The size of the newly developed BT2-2500, which is 347mm in width which is equal to that of BT2-
2000;and whose Ics is queal to Icu up to 85kA and whose short time withstand current is up to 65kA.
BT2-4000 and BT2-6300 can save space and costs forcustomers by meeting the requirements of
high capacity and miniaturization.
Higher breaking capacity and short-time withstand capacity
For the whole series of BT2 Circuit Breakers(not for BT2-1600 at 690V), Rated service Short-
circuit Breaking Capacity Ics is 100 percent equal to Rated Ultimate Short-circuit Breaking
Capacity Icu. As the rated service short-circuit breaking capaicty is up to 120kA at maximum and
short-time withstand current Icw is up to 100kA at maximum, the BT2 Series can confidently face
the challenge of all kinds of protected occassions.
Simply installed, cost-saving
BT2 Series Circuit Breakers bus bar terminals can be simply installed as follows: 1. Horizontal
connection; 2.
Vertical connection;3. Composite connection

·2·
1.3 GENERAL STRUCTURE
There are two kinds of circuit breakers: fixed and draw-out. The latter is formed by putting the
the main body into the exclusive draw-out socket. The main body is composed of contact system,
arc-over system, operating mechanism system, current transformer, intelligent controller, auxiliary
switch, secondary connector, under-voltage release, shunt release etc; The draw-out socket is
composed of two-side plates of cradle, base, crossbeam,etc….
Outline and Name of each part
Fig . Fixed1-1
Advanced and reliable safety performance
BT2 Series Circuit Breakers are reliable by the following aspects:
Reliable assurance of the three positions: connected, test, seperated by the locked and
automatically unlocked mechanismat the draw-out socket.
Clear indication of ready-for-switching-on to ensure safe manipulation and reliable operation
More reliable safety protection with secondary terminals of protection grade IP30
More complete protection and comprehensive selection
BT2 Series Circuit Breakers can implement zone selective interlock (ZSI) to ensure
comprehensive selection of various protection and reduce the copper bar's bearing of
thermodynamic.
Easy to integrate and realize networking management
BT2 Series Circuit Breakers can achieve the function of intelligent and networking monitor
and are easy for customers to carry out integrated management by adopting open
communication,protocol Modbus-RTU, which can connect with Field Bus such as Profibus,
DeviceNet by converter.

18
19
2021
22
23
24
Fig.1-3 Draw-out socket outline
·3·
Illustrations:
Installation hole
Satety back plate
Wiring terminals of secondary circuit
Side plate
Copper bar of the main circuit
Draw-out socket
Earthing point at draw-out socket
18
19
20
21
22
23
24
1
2
Fig.1-2 Draw-out
“ ”
“ ”
“ ”
“ ” “ ” “ ”
“ ”
Separated : indicates that main circuit
and secondary circuit are both in isolation.
test : indicates that main circuit is in
isolation and secondary cir cuit is in
connection.
connected : indicates that main circuit
and secondary circuit are both in connection.
The circuit breaker can be automatically
locked (rocker can not be turned at this point)
when its main body is at the position of
separated , test or connected
by turning the rocker, and can be unlocked by
pushing unlock button to the left side.
Illustrations:
Name Plate
Indication window of energy-storage and energy-release
Switching-on Button
Manual energy-storage handle
Brand
Wiring terminals of secondary circuit
"Switching-off "lock mechanism
Release indication and resetting button
Intelligent controller
Switching button
Indication of switching-on( "I" )andswitching-off( "O" )
Indication of ready-for-switching-on(" OK" )
Unlock button of the three positions( "separated ",
"test" and "connected" ) for draw-out circuit breakers
Rocker operating hole of the draw-out circuit breaker
Rocker storage hole of the draw-out circuit breaker
Indication of the three positions( "separated" , "test"
and "connected") of the draw-out circuit breaker
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
Note:

1.4 Protection characteristic curve of intelligent controller
Characteristic Curve
Time/Current Curve of Type L25 intelligent controller （I t）
2
·4·
Ir1
0.4 1 1.5 3 10 15
0.01
0.02
0.1
0.2
1
10
100
1000
10000
t(s)
0.3
0.4
Ir1
t1
long-time delay curve
Ir2I T ON2
Short-time delay curve
I T OFF2
Instantaneous curve
t2
Ir =(0.65～1)In
t =15s～480s 6 steps in total
1
1
The range of long-time delay
The range of short-time delay
Ir =(1.5～10)Ir +OFF
t =0.1s～0.4s 4 steps in total
2 1
2
Instantaneous range
Ir =(3～15)Ir +OFF3 1
Instantaneous range
Factory's setting value

Time/Current Curve of Type M25, M26 , H26, P25, P26 intelligent controller （I t）
2
·5·
0.4 1 10
0.01
0.02
0.1
0.2
1
10
100
1000
10000
t(s)
0.3
0.4
1.6 15 80
Ir =(0.4～15)In+OFF
2
2
Ir =(0.4～1)In
1
1
Ir =1.6kA～35kA+OFF3
2kA～50kA+OFF
2.5kA～50kA+OFF
4kA～65kA+OFF
6.3kA～80kA+OFF
Instantaneous
range
kAIr1
Ir1
t1
Ir2I T ON
2
I T OFF2
t2
Instantaneous curve
Instantaneous range
BT2-1600
BT2-2000
BT2-2500
BT2-4000
BT2-6300

Time/Current Curve of Type P25 and P26 intelligent controller (inverse time delay pecial It)s
·6·
0.4 1 10
0.01
0.02
0.1
0.2
1
10
100
1000
10000
t(s)
0.3
0.4
1.6 15
kAIr1
80
Ir =(0.4～15)In+OFF
2
2
Ir =(0.4～1)In
1
1
2kA～50kA+OFF
2.5kA～50kA+OFF
4kA～65kA+OFF
6.3kA～80kA+OFF
Instantaneous
range
Ir1
t1
Ir2I T ON
2
t2
I T OFF
2
Instantaneous curve
Instantaneous range
BT2-1600
BT2-2000
BT2-2500
BT2-4000
BT2-6300

Time/Current Curve of Type P25 and P26 intelligent controller (high-voltage fuse I t)4
·7·
Ir =(0.4～15)In+OFF
t =0.1s～0.4s
2
2 4 steps in total
Ir =(0.4～1)In
t =60s～1440s 6
1
1 steps in total
2kA～50kA+OFF
2.5kA～50kA+OFF
4kA～65kA+OFF
6.3kA～80kA+OFF
Instantaneous
range
0.4 1 10
0.001
0.1
0.2
1
100
1000
10000
100000
t(s)
0.3
0.4
1.6 15
kAIr1
80
10
0.01
Ir1
t1
Ir2I T ON2
t2
I T OFF
2
Instantaneous curve
Instantaneous range
BT2-1600
BT2-2000
BT2-2500
BT2-4000
BT2-6300

Time/Current Curve of Type M26 , H26 and P26 intelligent controller (for ground-fault protection)
·8·
Grounding current
Ir =(0.4～0.8)In(BT2-1600)
Ir =(0.2～0.8)In(BT2-2000、
BT2-2500)
Ir =(0.2～0.6)In(BT2-4000)
Ir =(0.2～0.5)In(BT2-6300)
t =0.1s～0.4s 4级 four steps
4
4
4
4
4
Ir4 Maximum
1200A(For BT2-2000、BT2-2500)
1000A(For BT2-1600)
1600A(For BT2-4000)
Maximum 2000A(For BT2-6300)
Maximum
Maximum
0.2 0.8 10 100
In
1
0.01
0.1
0.2
1
10
100
1000
t(s)
0.3
0.4
Maximum

Time/Current Curve of Type M25, M26 , H26 , P25 and P26 intelligent controller
(for load-monitoring pattern one)
·9·
I (0.2~1)InLC1=
I (0.2~1)InLC2=
t =t /2(t =15,30,60,120,240,480s)C1 1 1
t =t /4(t =15,30,60,120,240,480s)C2 1 1
ILC2 ≤ ILC1
0.2 0.8 10 1001
In
0.1
1
100
1000
10000
t(s)
200
10
tC1
ILC2
ILC1
tC2

Time/Current Curve of Type M25 , M26 , H26 , P25 and H26 intelligent controller
for Load-monitoring pattern one
·10·
0.2 0.8 10 1001
In
0.1
1
100
1000
10000
t(s)
10
60
0.4
ILC2
ILC1
tC1
tC2
I (0.2~1)InLC1=
I (0.2~1)InLC2=
t =t /2(t =15,30,60,120,240,480s)C1 1 1
t =60sC2

2.0 ACCEPTANCE
Check the type and specification of the breakers upon receiving. Remove the external package
carefully in order not to destroy the breakers.
3.0 STORAGE, TRANSPORTATION AND WEIGHT
The breaker is packed with wooden case and fixed on wooden crate by screws. If the breaker is
stored for a short period, please put it in the dry place with ventilation and cover it with waterproof
oilcloth.
Notice: ① Please put the breaker in the dry place without dust (the ambient temperature is
from -25℃ to +55℃ , the relative humidity is not more than 95% at 25℃) and corrosion of
chemical gas.
②The breaker should be open and put into the wooden case, the charging indicator (see
Fig.1-1, Fig.1-2 Preface) is at the position of DISCHARGED.
③Put the breaker or base on horizontal wooden stand (provided by the factory).
④Don't pile up breakers.
3.1 STORAGE
Put the breaker on the wooden stand horizontally and move it with fork lift. See Fig. 3-1.
3.2 TRANSPORTATION
Fig. 3-1
BT2
·11·

3.3 WEIGHT
See the following table: Unit: kg
Type
Rated
Current
BT2-1600
630
800
1000
1250
1600
3
4
3
4
3
4
3
4
3
4
3
4
3
4
·12·
400
200
BT2-2000
630
800
1000
1250
1600
2000
3
4
3
4
3
4
3
4
3
4
3
4
54.5
59.5
54.5
59.5
54.5
59.5
54.5
59.5
54.5
59.5
56
62
84.9
96
84.9
96
84.9
96
84.9
96
84.9
96
88
100
45
58
45
58
45
58
45
58
45
58
45
58
45
58
Pole
Number
Fixed Draw-out
28.8
36.5
28.8
36.5
28.8
36.5
28.8
36.5
28.8
36.5
28.8
36.5
28.8
36.5

BT2-4000
2000
2500
2900
3200
3600
4000
4000
5000
3
4
3
4
3
4
3
4
3
4
3
4
66
84.5
66
84.5
66
84.5
66
84.5
66
84.5
66
84.5
113.5
141.5
113.5
141.5
113.5
141.5
113.5
141.5
113.5
141.5
113.5
141.5
3
4
3
4
2000
2500
3
4
3
4
1250
1600
BT2-2500
3
4
3
4
3
4
BT2-6300
6300
·13·
65
78
95
110
65
78
95
110
65
78
95
110
65
78
95
110
135
166
227
280
135
166
227
280
135
166
227
280
Unit: kg
Type
Rated
Current
Pole
Number
Fixed Draw-out

4.0 UNPACKING AND NOTICE
4.1 UNPACKING
·14·
Fig. 4-2
Fig. 4-1
①
②
④
③
③

Unscrew the cross screws ① (16 or 20 pieces) around the under part of the wooden case, lift
the wooden case and remove it ( See Fig. 4-1);
As for fixed breaker, just remove four STC4.8-C Screws together with washers for fixing the
breaker in the wooden stand ③, then move it away from the stand;
As for draw-out breaker (See Fig. 4-2), turn the handle to pull out the main body till it is
obstructed (See7-3 for details). Lift up the main body from the draw-out socket and move it away.
Then remove four nuts of M10 and washers for fixing the socket with the wooden stand at the
bottom of draw-out socket in order to separate the socket from the wooden base. (Please make sure
the nuts and washers are already removed from the draw-out socket) Put the main body back into
the draw-out socket and finish the operations. (See7.3 for details)
④ ③
Check the following settings on the data plate, make sure they will satisfy your requirements
while making order.
Voltage of Shunt Release; 2. Voltage of Power-driven Operating Mechanism; 3. Voltage of
Closing electro-magnet; 4. Voltage of Intelligent Controller; 5. Voltage and Delayed Time of Under-
voltage Release; 6. Type of Auxiliary Switch
Check the items in package according to the packing list.
Do read the operation manual before the installation, operation and maintenance.
4.2 ITEMS TO CHECK BEFORE OPERATION
5.0 INSTALLATION
Put the breaker in the dry place where there is no dust, corrosive gas and explosive medium
and prevent it from striking. If the environment condition can’t be satisfied, protection grade of the
switchgear should be upgraded. Requirements of temperature, humidity and elevation see the
following table:
5.1 ENVIRONMENT CONDITION
Item
Ambient Temperature
Relative Humidity
Elevation
Norm
-5℃~+40℃ and the average is no more than +35℃ within 24 hours
The relative humidity of the gas is no more than 50% at the maximum temperature of
40℃. It may be higher at the lower temperature, for example, 90% at +20℃. Special
measures should be taken to prevent the breaker from dew caused by temperature
change.
≤2000m
·15·
4.0 UNPACKING AND NOTICE

Check insulation resistance of the breaker with megohm meter of 1000VDC, the value should
be no less than 20MΩwhen the ambient temperature is 25℃±5℃ and the relative humidity is
50%~70%.
Place to be tested: test the resistance between each phase and between phase and framework
when the breaker is closed; test the resistance between the incoming wire and outgoing wire for each
phase when the breaker is open.
5.2 PREPARATION
Take the main body out of the draw-out socket, then install the socket into the switchboard, fix
the socket with four screws of M10 (with washers) (See Fig. 5-1). The applied torque is from 17.7 N.
m to 22.6N. m. At last put the main body into the socket.
5.3 INSTALLATION OF DRAW-OUT BREAKER
Fig. 5-1
Put the breaker into switchboard, fix it with four screws of M10 (with washers). The applied
torque is from 17.7N. m to 22.6N. m (See Fig. 5-2)
5.4 INSTALLATION OF FIXED BREAKER
Fig. 5-2
·16·
5.0 INSTALLATION
Place for fixing the socket

Clean and dry the grounding point with cloth before the grounding of fixed and draw-out
breakers.
① Grounding of fixed breaker
Fix the PE cable on the grounding busbar of switchboard with M10 screw directly, cross
section of the cable see IEC 60439-1.
6.2 APPLIED TORQUE WHEN BUSBAR IS IN CONNECTION WITH WIRING TERMINALS
6.0 ELECTRICAL WIRING
Electrical wiring must be done by the professional technicians.
M10
M12
M16
17.7～22.6
31.4～39.2
78.5～98.1
35.4～45.2
62.8～78.4
157.0～196.2
6.3 GROUNDING
·17·
6.1SCHEMATICDIAGRAMFORSECONDARYCIRCUITTERMINALSOF BT2-1600 CIRCUITBREAKER
Diameter of Screw Applied torque N.m with spring spacer Applied torque N.m with flat spacer
Insert the slotted point screw driver (Φ3) into the square hole of the connector insert the
conductor wire into the round hole and at last remove the screw driver

Draw-out
6.4 POWER LOSS AND DERATING COEFFICIENT
6.4.1 Power Loss
The power loss is the wastage measured by which the circuit breaker is electrified with frame current
Inm (environmental temperature +40 ).℃
6.4.2 Derating Coefficient
The following table shows continual current-loading capacity of circuit breakers at different ambient
environmental temperature and under the conditions of the satisfaction of conventional heating in
IEC 60947-2
·18·
BT2-1600
BT2-6300
285
874
315
924
BT2-2000
BT2-2500
BT2-4000 795 854
146
445
161
492
+40℃ +45℃ +50℃ +55℃ +60℃
1Inm
1Inm
1Inm
0.97Inm
0.99Inm
0.96Inm
0.91Inm
0.96Inm
0.90Inm
0.87Inm
0.90Inm
0.86Inm
0.82Inm
0.87Inm
0.80Inm
1Inm
1Inm
0.95Inm
0.93Inm
0.89Inm
0.87Inm
0.85Inm
0.82Inm
0.78Inm
0.75Inm
Inm=2000A
Inm=1600A
Inm=2500A
Inm=4000A
Inm=6300A
Power Loss (W)
Type
Fixed
Ambient environmental
temperature
Continual
current-
loading
capacity
② Grounding of draw-out breaker
Fix the PE cable on the grounding busbar
of switchboard with the grounding screw on the
left side plate, cross section of the cable see
IEC 60439-1

The specifications of copper bars in the above table are introduced under which the circuit breakers by open
installation are at maximum ambient temperature of 40 and satisfy the conventional heating condition in IEC60947-2℃
6.5 SPECIFICATIONOF THECOPPER BUSBARWIREDINTHE PRIMARY CIRCUIT OF DRAW-OUT BREAKER
·19·
Size（mm×mm）
630
630
400
200
2
2
2
2
3
50 5×
20 5×
50 5×
800
800
2 60 5×
1000
1000
2 60 5×
1250
1250
1250
3
4
3
60 5×
60 5×
1600
1600
1600
2
2
60 10×
60 10×
60 10×
2000
2000
2000
2000
3
3
3
60 10×
50 10×
60 10×
100 5×
2500
2500
4
4
100 5×
2900 3 100 10×
3200 4 100 10×
3600 4
6
8
100 10×
4000
4000
5000
6300
4000
6300
5
5
100 10×
100 10×
100 10×
100 10×
Rated Frame Current Inm(A) Rated Current In(A)
2500
1600
1
1
40 5×
40 5×
50 5×
40 5×
Busbar specification
Amount
6.4.3 Derating capacity for high altitude
If altitude is over 2000m, the electrical performance of breaker could be corrected as follows:
Altitude（m）
Power frequency with stand voltage(V)
Correction factor for working current
2000
3500
1
3000
3150
0.93
4000
2500
0.88
5000
2000
0.82

7.0 OPERATION
7.1 Charging Operation
Manual charging operation
Turn the energy-charging handle up and down for several times (about 6-7 times) till there
isn t any feeling of repulsion.
①
’
Fig. 7-1
② “ ”
“ ”
As the charging operation finishes, Charged/Discharged indicator will be at
Charged position.
Power-driven charging operation
As the control circuit is electrified, power-driven charging operation will start automatically
(the control circuit has already charged automatically in advance)
7.2 On and off operation
·24·
7.2.1 Manual switching on and off
Switching-on
As the circuit breaker is charged and switched off, and when ready-for-switching-on
indicates OK , push the black button (See Fig. 7-2), the circuit breaker will be switched
on and On/off indicator shifts from red to green .
①
“ ” “ ”
“ ” “Ο” “ ”
BT2-1600 Circuit Breaker BT2 with frame current of 2000A and above

Switching-off
As the circuit breaker is switched on, push the red button (See Fig. 7-3), it will be
switched off at once. At this time, On/off indicator should be at the position of red .
②
“Ο”
“ ” “Ο”
Fig. 7-2
Note: When switching-off lock mechanism is installed, it has to be unlocked
before the above operation.
Fig. 7-3
·25·
7.2.2 Power-driven switching on and off
Switching-on
As the circuit breaker is charged and switched off, it can be switched on by providing the
closing electro-magnet with rated voltage.
Switching-off
As the circuit breaker is switched on, it can be switched off by providing the shunt release with
rated voltage.
①
②
7.0 OPERATION
BT2-1600 Circuit Breaker
BT2 with frame current of 2000A and above

7.3 OPERATION OF DRAW-OUT BREAKER
7.3.1 Operation of BT2-1600 draw-out circuit breaker
7.3.1.1 Push the main body into the socket
Pull out the slideway, See Fig. 7-4①
Fig. 7-4
Put the main body on the slideway, See Fig. 7-5, and push it inside the socket till it can't be
pushed any more, See Fig. 7-6.
②
Fig. 7-6
·26·
Fig. 7-5
7.0 OPERATION

Push the slideway into the socket, See Fig. 7-7③
Fig. 7-7
Pull out of the rocker from its storage hole and fully plug it into the hole at the bottom of draw-out
socket, move unlock button to the left side, See Fig. 7-8
④
“ ”
·27·
Fig. 7-8
7.0 OPERATION

Turn the rocker in clockwise. When the indicator is at the position of test , the circuit
breaker will be locked automatically and the rocker can not be turned.
The unlock button has to be moved to the left, and the rocker continues to be turned in
clockwise. When the indicator is at the position of connected , the circuit breaker will be locked
automatically ,pull out the rocker and put it back to the original place, See Fig. 7-9
⑤ “ ”
“ ”
Fig. 7-9
Fig. 7-10
·28·
7.0 OPERATION
7.3.1.2 Pull out the main body
Move the unlock button in order to unlock the mechanism at the position of connected
at first, then turn the rocker to move the main body from connected to separated (turn the
rocker in counter clockwise, notice in this process: the button is locked automatically at the position
of test , the unlock button has to be moved in order to pull out the main body), when the position
indicates separated and it is locked, the rocker can be pulled out.
① “ ”
“ ” “ ”
“ ”
“ ”

Pull out the slideway, See Fig. 7-11②
Pull the main body out of the draw-out socket, See Fig. 7-12, and take out the main body,
See Fig. 7-13
③
Push the slideway back into the socket, See Fig. 7-14④
·29·
Fig. 7-11
Fig. 7-12 Fig. 7-13
Fig. 7-14
7.0 OPERATION

Lock catch
Fig. 7-15
Fig. 7-16
·30·
7.3.2.1 Push the main body into the socket
① Press the lock catch with thumb, pull out the slideway till it can't be moved
② Put the main body on the slideway as shown in Fig. 7-15, note that the main body should
be stuck right on the slideway.
7.3.2 Operation of draw-out BT2-2000 circuit breaker with frame current 2000 and
above
'③ “ ”Push the main body inside the socket till it can t pushed any more and click occurs,
See Fig. 7-16
7.0 OPERATION

Fig. 7-17
Fig. 7-18
·31·
13
17
13
15
16
7.0 OPERATION
④ Pull out of the rocker from its storage hole 16 and fully plug it into the operation hole 15 at
the bottom of draw-out socket, push “unlock button” 13 to the left side, See Fig. 7-17
⑤ Turn the rocker in clockwise. When the indicator 17 is at the position of “test” , the
circuit breaker will be locked automatically and the rocker can not be turned.
The unlock button 13 has to be pushed to the left, and the rocker continues to be turned in
clockwise till it can't be moved. When the indicator is at the position of “connected”, the rocker
can be pulled out to the original place.
7.3.2.2 Pull out the main body
① Move the “ unlock button” in order to unlock the mechanism at the position of
“ connected” at first, then turn the rocker to move the main body from “ connected” to
“separated” (turn the rocker in counter clockwise, notice in this process: the button is locked
automatically at the position of “test”, the “unlock button” has to be moved in order to pull out
the main body)

Fig. 7-19
Fig. 7-20
Fig. 7-21
·32·
Lock catch
7.0 OPERATION
② After the rocker is pulled out, press the lock catch to pull out the main body as shown in Fig.
7-20, note that when the main body is pulled out, prevent it from pouring out and falling due to
forward move of centre-of-gravity.
③ Take the main body out of the draw-out socket as shown in Fig. 7-21, then push the
slideway back into the socket.

7.4LOCK ATTHE POSITION OF“SEPARATED”BY SAFETYPADLOCKMECHANISMFORTHE DRAW-OUT SOCKET
Fig. 7-22
·33·
7.0 OPERATION
Operating process as follows:
① Pull out the locking stick as shown in the Fig;
② Pierce the stick through the padlock, at this time, the circuit breaker can't be moved from
“separated” to “test” or “connected”.
Unlock button
Three-position indication
Note: the padlock should be provided by users themselves.
“ ”Separated position
Safety padlock mechanism
BT2-2000 and above
“ ”Separated position
Safety padlock mechanism Unlock button Three-position indication

8.0 SETTING AND USE OF INTELLIGENT CONTROLLER
8.1 SETTING AND USE OF TYPE L25 INTELLIGENT CONTROLLER
8.1.1 Panel illustrations
1. Light columnar indication of loading rate (%Ir )
2. Indication of controller power supply
3. Indication of long-time delayed fault
4. Indication of short-time delayed fault
5. Indication of instantaneous fault
6. Adjustment of instantaneous operating current
7. Adjustment of short-time delayed current
8. Clear button
9. Adjustment of imitative test current
10. Test terminal (for the Factory s testing and checking)
11. Test button
12. Adjustment of short-time delayed time
13. Adjustment of long-time delayed time
14. Adjustment of long-time delayed current
15. Indication of alarm and trip
1
“ ”
’
·34·
1
2
3
4
5
6
7
8
9
1011
12
13
14
15

8.1.2 Setting of protection parameters
Parameters of the intelligent controller can be set in the network while the auxiliary electric
source is provided by controller’s power supply ( Wiring pattern see Chapter 6.6)
For example: Rated current In is equal to 2500A; the parameters such as Ir =0.8In, t =480s;
Ir =8Ir , t =0.2s; Ir =10Ir orginally set can be changed as follows: Ir =1750A, t =60s; Ir =14kA,
t =0.2s (the function of inverse time protection I t should be cancelled); Ir =17.5kA
Operate as follows:
Convert the above current settings into the multiple of In (or Ir ) so that it will be easy to be
adjusted.
Ir =0.7In, t =60s
Ir =8Ir , t =0.2s (I t OFF)
Ir =10Ir
Turn the knob to the target point with screw driver, See Fig. Below
1 1
2 1 2 3 1 1 1 2
2
2
3
1
1 1
2 1 2
3 1
2
Note: New settings will be valid after 5 seconds. In case that fault happens within this period,
Please operate the circuit breaker in terms of the original settings.
8.1.3 Test
Push “test” button to check the setting of test current
If only checking current-time feature of the controller: make the circuit breaker be switched
off before test with auxiliary power supply.
If checking current-time feature of the controller and the operation of operating mechanism at
the same time: make the circuit breaker be switched on before test.
·35·
trip test
clear
test

For example: ① Set the test current on 1.5In as shown in Fig. Above, push the test button once
again, the delayed operating time should be within the range of t ’(stipulated time)±15%.
Note: t ’ (stipulated time) must be converted. In this case, if the value of Ir (equal to 0.7In)
and the value of t (equal to 60s) is adjusted, put the value of Ir and the value of t into the formula:
(1.5Ir ) t =(1.5Ir ) t ’, the value of t ’ can be worked out.
② Set the test current on 10In, then I will be 10 multiple with 2500, equal to 25kA which
keeps within the range of instantaneous prection Ir . Press test button and the circuit breaker will
operate at once.
③ Push the button of “clear” and “RESET” after test in order to operate the circuit
breaker regularly.
Note: In order to avoid mistakes, turn the knob for setting the test current to the right value
prior to each test, and the setting is only effective within 2 minutes. If over 2 minutes, turn the knob
once again even though test current is the same.
8.1.4 Indication of alarm and trip
Light columnar indication of Real-time current (loading rate in percentage of Ir1), indication
of alarm and trip see the Fig. Below.
1
1 1
1 1 1
1
2
1 1
2
1 1
3
A
○
●
○
●
·36·
90%
50%
20%
90
105
%Ir1
I1 I2 I3 IN
Ir2 Ir2 Ir3
Light off (real-time current under A line)
Yellow light on (real-time current above A line and
under 105%)
Yellow Light flash (real-time current above 105%)
Red light on (tripped)
The corresponding light will be on after the circuit breaker is tripped.
Power indicator
Tripped/alarm

8.2 SETTING AND USE OF TYPE M25, M26 AND H26 INTELLIGENT CONTROLLER
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
22.
23.
24.
25.
26.
27.
28.
29.
30.
31.
32.
33.
8.2.1 Panel illustrations
8.2.1.1 Type M25 and M26 Panel
·37·
U12 U13 U31 MIN
test
V
I1 I2 I3 MAX
A
kA
S
tr ip Ir1 Ir2 Ir3
MEM ILC1 ILC2
M25 Inetlligent Controller
fault
8.1.5 Resume operation of the circuit breaker
To re-operate the cirucit breaker after being tripped due to fault: press clear button and
press RESET button on the panel, then the circuit breaker will be switched on.
“ ”
“ ”
Three phases of line voltage and indication of mimimum
line voltage in operation
Voltage indication screen
Voltage unit
Test indication
Indication of three phases current, neutral phase current,
earthing fault current and maximum phase current in
operation
Current and time indication screen
Current unit A
Current unit kA
Time unit
Earthing fault indication, overload long-time delayed
fault indication, short-circuit short-time delayed fault
indication, instantaneous fault indication
Indication of earthing fault current setting (with alarm)
Indication of long-time delayed current setting (with
alarm)
Indication of long-time delayed operating time
Indication of short-time delayed current setting (with
alarm)
Indication of short-time delayed operating time setting
Indication of instantaneous current setting
Indication of earthing fault operating time setting
Load mointoring signal 2
Memory indication
Consecutive decrease of setting values
"mem"button
Wearing indication button
"clear" button
Power supply socket for test (DC24V)
"non-trip" test button
"trip" test button
"inspect fault" button
Current indication button
Voltage indication button
"set" button
Consecutive increase of setting values
Trip indication
Note: M25 has the same function with M26 except without
earthing fault protection.
trip test
clear
test
U12 U13 U31 MIN
V
I1 I2 I3 MAX
A
kA
S
Ir1 Ir2 Ir3
ILC1 ILC2
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
2627
28
29
30
31
32
33
IG
Ir4
M26 Inetlligent Controller
test
fault
trip
MEM

8.2.1.2 Type H26 panel
8.2.2 Current, voltage (optional) indication
Fig. 8-1
·38·
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
22.
23.
24.
25.
26.
27.
28.
29.
30.
31.
32.
33.
34.
35.
36.
Three phases of line voltage and indication of mimimum
line voltage in operation
Voltage indication screen
Voltage unit
Test indication
Indication of three phases current, neutral phase current,
earthing fault current and maximum phase current in
operation
Current and time indication screen
Current unit A
Current unit kA
Time unit
Earthing fault indication, overload long-time delayed
fault indication, short-circuit short-time delayed fault
indication, instantaneous fault indication
Indication of earthing fault current setting (with alarm)
Indication of long-time delayed current setting (with
alarm)
Indication of long-time delayed operating time
Indication of short-time delayed current setting (with
alarm)
Indication of short-time delayed operating time setting
Indication of instantaneous current setting
Indication of earthing fault operating time setting
Memory indication
Consecutive decrease of setting values
"mem" button
Wearing indication button
"clear" button
Power supply socket for test (DC24V)
"non-trip" test button
"trip" test button
"inspect fault" button
Current indication button
Voltage indication button
"set" button
Consecutive increase of setting values
Trip indication
Communicaion
Station No.
Remote control
Current meter
Voltage meter
Current meter
set
U I
inspect
fault
trip non-trip
%
set
U I
inspect
fault
trip non-trip
clear
mem
test
test
H26
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
2627
28
29
30
31
32
33
34
35
36
COMM
U12 U13 U31 MIN
I1 I2 I3 MAX
A
kA
S
Ir1 Ir2 Ir3
ILC1 ILC2
IG
Ir4
IN
V
MEM
t rip
fault
test
ADDR REM
H26IntelligentController

8.2.2.1 Current meter The maximum current value in three phases will display in operation
[the current value as shown in the Fig. 8-1 indicated in the current meter is the maximum current I
in three phases(light of I and MAX on), equal to 1600A. Press the button of “I” to display I (four
poles), I (Type M26 and H26) and the real-time value of I ,I ,I in circulation, the maximum real-
time value will display again after 5 minutes without operation.
8.2.2.2 Voltage meter The minimum voltage value of three phases will display in operation [the
voltage value as shown in the Fig. 8-1 indicated in the voltage meter is the minimum voltage U in
three phases (Light of U and MIN on), equal to 380V]. Press the button of “U” to display U , U
and U in circulation, the minimum real-time value will display again after 5 minutes without
operation.
8.2.3 Setting of protection parameters
Parameters of the intelligent controller can be set in the network, but at this time the load
current should be less than the setting current. There are two ways of power supply for the controller:
(1) auxiliary power supply; (2) DC24V input from the panel.
Operate as follows: (No earthing fault protection for Type M25, without the setting of Ir and t )
(1) Display: Press “set” button to choose the desired parameters such as Ir , t , Ir , Ir , t ,
I and I . When the light is on, the corresponding value will display on the screen.
(2) Adjustment: Press “Δ” (increase by degrees) or “ ” (decrease by degrees) button,
adjust the displayed value to the desired or approximate value. Press “Δ”button, Ir and Ir can
be “OFF”, short-circuit short-time delayed and short-circuit instantaneous protection will be
shut.
(3) Save: Press “mem” button, the corresponding light will flash once, which means the
setting value has been saved.
[Example] Take the controller with In=1600A as an example; the original setting values of
Ir =1600A, t =30s; Ir =9.6kA, t =0.2s; Ir =19.5kA; Ir =1200A, t =0.4s.
2
2 N
G 1 2 3
31
31 12 23
31
4 4
1 1 3 4 4
LC1 LC2
2 3
1 1 2 2 3 4 4
△
·39·

·40·
a) When the control is
electrified, the screen
will display 0 for
the operating current
of the main circuit.
“ ”
b) Press "set" button
and when the "Ir "
light is on, the screen
w il l di sp la y t he
original setting value
of 1600A.
1
c) Adjustment: Press
button, the
value on the screen
will decrease 20A by
degrees till the screen
displays 1380A.
“ ▽ ”
d) Press "mem" button
and the new setting
will take effect.
BT2-1600
1. The seting value of Ir is equal to 1380A (t is still 30s), operate as follows:1 1
set
U I
trip
inspect
fault
mem
clear
non-trip
MEM
trip
fault
test
set
U I
trip
inspect
fault
mem
clear
non-trip
MEM
trip
fault
test
set
U I
trip
inspect
fault
mem
clear
non-trip
MEM
trip
fault
test
set
U I
trip
inspect
fault
mem
clear
non-trip
MEM
trip
fault
test

·41·
a) When the control is
electrified, the screen
will display 0 for
the operating current
of the main circuit.
“ ”
b) Press "set" button
and when the "Ir "
w il l di sp la y t he
of 1600A.
1
c) Adjustment: Press
button, the
value on the screen
will decrease 20A by
displays 1380A.
“ ▽ ”
d) Press "mem" button
and the new setting
will take effect.
BT2-2000 and above
set
U I
tripinspect
fault
mem
clear
non-trip
MEM
trip
fault
test
%
set
U I
tripinspect
fault
mem
clear
non-trip
MEM
trip
fault
test
%
set
U I
tripinspect
fault
mem
clear
non-trip
MEM
trip
fault
test
%
set
U I
tripinspect
fault
mem
clear
non-trip
MEM
trip
fault
test
%
In=1600A
In=1600A
In=1600A
In=1600A

2. The re-setting value of t is equal to 0.3s and the function of I t is shut off, operate as follows:2
2
·42·
set
U I
trip
inspect
fault
mem
clear
non-trip
MEM
trip
fault
test
a) Press "set" button
and when the "t "
will di sp la y t he
of 0.2s.
2
b) Adjustment: Press
button, the
value on the screen
will increase 0.1s by
displays the original
s et t in g va lu e of
OFF 0.3s .
“ Δ ”
“ ”
c) Press "mem" button
and the new setting
will take effect.
BT2-1600
set
U I
trip
inspect
fault
mem
clear
non-trip
MEM
trip
fault
test
set
U I
trip
inspect
fault
mem
clear
non-trip
MEM
trip
fault
test

·43·
and when the "t "
of 0.2s.
2
button, the
value on the screen
will increase 0.1s by
displays the original
s et t in g va lu e of
OFF 0.3s .
“ Δ ”
“ ”
and the new setting
will take effect.
BT2-2000 and above
set
U I
tripinspect
fault
mem
clear
non-trip
MEM
trip
fault
test
%
set
U I
tripinspect
fault
mem
clear
non-trip
MEM
trip
fault
test
%
set
U I
tripinspect
fault
mem
clear
non-trip
MEM
trip
fault
test
%
In=1600A In=1600A
In=1600A

3. The earthing fault protection feature (Only for Type M26 and H26) is shut off, operate as follows:
Note: All protection parameters can be
adjusted by following the above steps.
Check: After the setting operation is over,
press “clear” button and “set” button in
succession to check the displayed new value of
protection parameters, which should be the
same as the desired values. (Note: The
controller will recover its displaying of current
if no buttons are pressed within 10 seconds.)
·44·
and when the "t4"
of 0.4s.
button till
the s cr een will
display OFF .
“ Δ ”
“ ”
and the new setting
will take effect.
BT2-1600
set
U I
trip
inspect
fault
mem
clear
non-trip
MEM
trip
fault
test
set
U I
trip
inspect
fault
mem
clear
non-trip
MEM
trip
fault
test
set
U I
trip
inspect
fault
mem
clear
non-trip
MEM
trip
fault
test

Note: All protection parameters can be
adjusted by following the above steps.
Check: After the setting operation is over,
press “clear” button and “set” button in
succession to check the displayed new value of
protection parameters, which should be the
same as the desired values. (Note: The
controller will recover its displaying of current
if no buttons are pressed within 10 seconds.)
·45·
and when the "t4"
of 0.4s.
button till
the s cr een will
display OFF .
“ Δ ”
“ ”
and the new setting
will take effect.
BT2-2000 and above
set
U I
tripinspect
fault
mem
clear
non-trip
MEM
trip
fault
test
%
set
U I
tripinspect
fault
mem
clear
non-trip
MEM
trip
fault
test
%
set
U I
tripinspect
fault
mem
clear
non-trip
MEM
trip
fault
test
%
In=1600A In=1600A
In=1600A

8.2.4 Test
The protection characteristics including long-time delay, short-time delay, instantaneous and
earthing fault can be tested. There are two kinds of testing ways: “trip” test and “non-trip” test.
As for the “trip” test, set the current value at which the circuit breaker will trip, press “trip”
button and the circuit breaker should be switched off (In general, this test is carried without load);
As for the “ non-trip” test, set the current value at which the circuit breaker will trip, press
“non-trip” button and the circuit breaker shouldn’t be switched off.
[Example] Test of long-time delayed operating features (1.5Ir )
1. As first, check the original setting value of Ir and t , operate as follows:
1
1 1
·46·
and when the "Ir "
will displa y the
of 1380A.
1 b) Press set button and
when the t light is on,
the screen will display the
original setting value of 30s.
“ ”
“ ”1
and when the "Ir "
will displa y the
of 1380A.
“ ”
“ ”1
BT2-1600
BT2-2000 and above
set
U I
trip
inspect
fault
mem
clear
non-trip
MEM
trip
fault
test
set
U I
trip
inspect
fault
mem
clear
non-trip
MEM
trip
fault
test
set
U I
tripinspect
fault
mem
clear
non-trip
MEM
trip
fault
test
%
set
U I
tripinspect
fault
mem
clear
non-trip
MEM
trip
fault
test
%
In=1600A In=1600A

2. The setting of parameters for test
and when the "Ir "
ligh t is on, th e
screen will display
the original setting
value of 1380A.
“ ”
“ ”1
and when the "Ir "
ligh t is on, th e
screen will display
the original setting
value of 1380A.
“ ”
“ ”1
BT2-1600
BT2-2000 and above
·47·
set
U I
trip
inspect
fault
mem
clear
non-trip
MEM
trip
fault
test
set
U I
trip
inspect
fault
mem
clear
non-trip
MEM
trip
fault
test
U I
tripinspect
fault
mem
clear
non-trip
MEM
trip
fault
test
%
set
U I
tripinspect
fault
clear
non-trip
MEM
trip
fault
test
%
In=1600A In=1600A

3. Test operation
·48·
a) Press non-trip
b u t t o n a n d t h e
corresponding light of
test will be on.
“ ”
“ ”
b) The screen will display
0 and the corresponding
light flashs. With the setting
time of 30s elapsed, the
corresp onding ligh t of
trip , Ir1 and fault
will be on, which means the
completion of test operation.
“ ”
“ ” “ ”
a) Press non-trip
b u t t o n a n d t h e
corresponding light of
test will be on.
“ ”
“ ”
b) The screen will display
0 and the corresponding
light flashs. With the setting
time of 30s elapsed, the
corresp onding ligh t of
trip , Ir1 and fault
will be on, which means the
completion of test operation.
“ ”
“ ” “ ”
BT2-1600
BT2-2000 and above
set
U I
trip
inspect
fault
mem
non-trip
MEM
trip
fault
test
set
U I
trip
inspect
fault
mem
non-trip
MEM
trip
fault
test
clear
set
U I
tripinspect
fault
non-trip
MEM
trip
fault
test
%
non-trip
set
U I
tripinspect
fault
MEM
trip
fault
test
%
mem
clear
In=1600A In=1600A

4. Checking the test result
a) With the completion of test operation, press “inspect fault” button and “I” button till
the light of “I ” (“I ”, “I ”) is on (interval between two steps should be within 5s), at the time
which the screen displays the imitative breaking current value of 2060A.
b) Press “I” button again, the light of “A” will be off and the light of “s” will be on, at
the time which the screen displays the imitative operating time value of 30.60s within the range of
the setting value: t (30s)±15%, which keeps in accordance with the setting operating features.
1 2 3
1
BT2-1600
BT2-2000 and above
·49·
U I
trip
inspect
fault
mem
non-trip
MEM
trip
fault
test
clear U I
trip
inspect
fault
mem
non-trip
MEM
trip
fault
test
clear
U I
tripinspect
fault
non-trip
trip
fault
test
%
MEM
mem
clear U I
tripinspect
fault
non-trip
trip
fault
test
%
MEM
mem
clear
In=1600A In=1600A

8.2.6 Breaking due to fault
After the circuit breaker is tripped due to fault, the controller will display fault current value,
operating time, fault phase, fault type and tripping state. The data on panel as shown in the Fig.:
● “trip” light is on
● Breaking current:2060A
● Fault phase: phase A when “I1” light is on
● Fault type: overload long-time delay
● “Ir ” light is on1
8.2.5 Alarm indication
1. Load-monitoring alarm
2. Overload (fault) alarm
·50·
a) The operating current of
monitored load reaches the
setting values of I and
I , the light of I
and I will flash.
LC1
LC2 LC1
LC2
“ ”
“ ”
b) After the setting
values of delayed
time tc1 and tc , the
c on t r o l le r wi ll
output the contact
signal and the light
of I and
I will be
s w i t c h ed f r o m
flashing to being
lightened.
2
LC1
LC2
“ ”
“ ”
When the operating current
is within the range of
1.05Ir to 1.20Ir , the light
of Ir will flash.
1 1
1“ ”
BT2-1600 BT2-2000 and above
MEM
trip
fault
MEM
MEM
U I
tripinspect
fault non-trip
trip
fault
test
%
MEM
mem
clear
set
U I
trip
inspect
fault
mem
non-trip
MEM
trip
fault
test
clear
set
In=1600A

Press “inspect fault” button and then press “I” button
·51·
8.2.7 Fault memory
After the circuit breaker is tripped due to circuit fault, the controller will display fault type,
fault phase and breaking current value at once. If the breaking time should be checked, operate as
follows: press “clear” button
U I
trip
inspect
fault
mem
non-trip
MEM
trip
fault
test
clear
set
U I
tripinspect
fault
non-trip
trip
fault
test
%
MEM
mem
clear
set
U I
trip
inspect
fault
mem
non-trip
clear
MEM
trip
fault
test
U I
tripinspect
fault non-trip
trip
fault
test
%
MEM
mem
clear
In=1600A
In=1600A

Press “I” button again to display the breaking time
·52·
trip
fault
test
MEM
8.2.8 Resume operation
To resume operation after the circuit breaker trips due to fault: press “clear” button, press
“reset” button on the panel and then the circuit breaker will be switched on.
8.2.9 Other
① Contact wearing indication
Press "inspect fault" to display
the value (10 on the screen)
which stands for the wearing
degree of the contact.
Press "%" to display
the value (10 on the
screen) which stands
for the wearing degree
of the contact.
U I
trip
inspect
fault
non-trip
MEM
trip
fault
test
clear
set
U I
tripinspect
fault
non-trip
% clear
set
trip
fault
test
MEM
In=1600A

·53·
② Self-diagonosis
If the screen displays
" E r r 8 " , t h e r e i s
something wrong with
the program saving.
If the screen displays
Err9 , the extra high
temperature inside of
the controller exceeds
80 5 .
“ ”
℃± ℃trip
fault
test
MEM
trip
fault
test
MEM
8.2.10
BT2-1600
BT2-2000 and above
U I
trip
inspect
fault
non-trip
clear
set
U I
tripinspect
fault
non-trip
% clear
set
Press the "set" button until the "ADDR" light is on
,meanwhile, when the "current and time screen"displays"A×××
","b×××"and"P ×",it represents entering of communication
address, baud rate and odd-even parity bit adjustment state,then
press"△"" "to adjust, after adjustment,press"mem"button to save
the setting.
△
The communication parameter adjustment of the H26 Controller

·54·
8.3 Characteristic setting and use of P25 and P26 controller
Refer to BT2 Intelligent Universal Circuit Breaker-P25 & P26 Intelligent Controller-
Operation Manual for details.
8.4 Communication function of H26, P25 and P26 controller
“Four remote function could be realized through a communication ports by upper devices.
It could transmit datas of real-time current, voltage, fundamental current, fundamental voltage,
power, power factor, energy, frequency, harmonic voltage's distortion and total harmonic voltage's
and current’ s distortion(only current and voltage for H26); read and modify setting values of
breakers; read the product code, type, alarm signal, fault record, position of main body, states of
ready-for switching on and position of close, etc; remote open or close breaker.
① When the breaker is communicating with the upper devices, “Communication” on the
controller will flash.
② When “Remote” is lighten on, upper devices could remote-control the breaker(open,
close or modidy setting values). If users want to set values on the breaker, “Clear” should be
pressed and users should wait until the “Remote” is lights out.
③ Press addresses(site No., baud rate and parity check bit) of breaker could be referred by
pressing Voltage Display button on the control panel of breaker.
● Parameters of Serial Port
① RS485 interface and ModBUS-RTU mode are applied(please contact with the producer for
details);
② Baud rate: 19200bps(1200, 2400, 4800, 9600 and 38400 are also supported);
③ Communication adress: 1-119;
④ Frame format: 1 start bit, 8 bits, 1 stop bit and even check(no check and odd check are
supported)
● Note:
① Communication line is twisted pairs shielded line, the cross section area of which is more
than 0.34mm . The Max. distance between lines is 1200m. The communication distance could be
prolonged by repeaters.
② 1 line could connect 32 communicatable breakers (16 breakers with components of draw-
out socket communication module).
③ Parameters of serial port should match with each other so that the upper devices could
communicate with breakers, for the communication addresses of breakers in the same
communication line is different.
④ Secondary wiring of communicatable breakers should be connected according to Picture
6.6.2(BT2-1600) and 6.6.4(BT2-2000~6300).
● Connection of terminals
”
2
① Terminal 8 to RS-485, Data+(A); Terminal 10 to RS-485, Data+(B); Terminal 12 to SH.
② Please do correctly connect the communication lines, use shielded cables and avoid closing
to strong electricity lines.
Terminal
8
10
12
Signal
DATA+(A)
DATA-(B)
SH
Function
Receive/send data +
-
connect shielding layer
Receive/send data

Note: As an option, this accessory is necessory when remote reading of main body postions of draw-out
breakers is required.
Components of draw-out
socket communication
module
BT2
Moniter computer
RS232
RS485
RS232/RS485
Converter
DATA＋
DATA－
Mod BUS
BT2
BT2 BT2
Note: ① Please protect the controller against dust, humidity and mechanical damage while setting.
② Make sure Ir1<Ir2<Ir3 while setting parameters again
④ If the circuit breaker trips due to fault, remove the troubles in terms of the indications on the panel before
the circuit breaker is in operation again.
③ The following items should be checked by technicians before operating the circuit breaker: whether the
setting of parameters is correct, whther the intelligent controller is cleared and resetted, whether the circuit breaker
is in normal condition and should be tested. Inspect the circuit breaker while its operation. Get rid of any faults or
abnormalities in time.
8.5 Other Functions
① Self-diagnosis: this function is to check and protect the circuit breaker in its operation.
Should the temperature inside the controller exceed 80℃±5℃, alarm signal will be send out at
once (the controller is still in normal operation)
② Thermal memory: the memory function imitating the feature of bimetal is available when the
controller operates due to overload or short-circuit short-time delay in the circuit. The energy stored
due to overload will discharge in 10 minutes, while the energy stored due to short-circuit short-time
delay will discharge in 5 minutes. During this period, if the circuit breaker is switched on, the
delayed operating time will be shortened due to overload or short-time delay. Therefore, the circuit
or electrical devices can be protected.
③ Fault memory: the intelligent controller can display fault type, fault phase, fault curernt and
breaking time after the circuit breaker breaks due to fault.
④ MCR:Should short-circuit short-time delay happen while the circuit breaker is in the
process of being switched on or the controller is initialized by being electrified, the circuit breaker
will be switched off instantaneously without time delay.
·55·

When several of circuit breakers are linked together up and down, zone selective interlock can
ensure fully-selective protection of circuit breakers at up-stream or down-stream so as to reduce
the range of operation by fault and the breaking time of circuit breakers. This function serves for
short-circuit short-time delay (I t OFF) and earthing fault protection of circuit breakers.
As the sketch shown above, control lines can interlock with other units of circuit breakers
equipped with intelligent controllers of Type M25, M26 and H26.
After detecting the fault, the intelligent controller (zone 2) will send out a signal to circuit
breakers (zone 1) at higher level and check whether the signal of circuit breakers (zone 3) at lower
level arrives. If circuit breakers at lower level send out a signal, the circuit breaker will be switched
on at the time duration of release delay; if circuit breaker at lower level don’t send out a signal, the
circuit breaker will break at once no matter whether the release has the protection of delay.
2
Note: 21, 22, 23 and 24 serve as the wiring terminals of secondary circuit.
Busbar
Zone1
Circuit Breaker at up-stream level
Release delay t2
21
22
23
24
Control line
Control line
Fault
Circuit breaker at
down-stream level
21
22
23
24
21
22
23
24
21
22
23
24
·56·
Busbar
Release delay t2
Zone2
Control line
Control line
Busbar
Zone3
⑤ Zone Selective Interlock (ZSI)
Zone Selective Interlock (ZSI) (for Type M25, M26 and H26 intelligent controller)

9.0 CHECKING
Debug and check the following items in the table:
1
2
3
4
5
6
7
10.0 TRIAL OPERATION
Check the following items before its operation:
① Check whether the wiring is correct
② Make sure that terminals connection and screws are fixed firmly
③ Reset button after faulty trip should be in the state of “reset” on the panel of intelligent
Do not operate the breaker in the environment of explosive gas, otherwise
explosion may happen;
Do not operate the breaker in the environment of corrosive gas,otherwise,
the insulation and metal parts may be damaged.
10.1 CHECK AND PREPARATION
·57·
No. Items to check Procedure Checking operation
Operating mechanism
Motor-driven operating
mechanism
Under-voltage release
Shunt release
Closing electromagnet
“ ”Switching-off locking
device
Auxiliary Switch
Charge the breaker and switch it on and
off for several times by hand (the under-
voltage release should be electrified in
advance)
Provide the charging motor with power
supply, switch the breaker on and off for
several times
Provide the under-voltage release with
power supply, the circuit breaker should
be switched on; the circuit breaker
should be switched off without power
supply of the under-voltage release
Provide the shunt release with power
supply after the circuit breaker is
switched off
Provide the closing electromagnet with
power supply after the breaker is
switched on
Switch the breaker off, press the
switching-off button while turning the
key in counter clockwise, then pull it out
Provide the corresponding contact with
signal
Check whether the
mechanism runs smoothly and
whether the switching on and
off is free and easy
Check whether the charging
motor works normally without
noise; whether the breaker is
switched off
Check whether the breaker
can be switched on normally,
whether the indication is
correct, whether the breaker
is switched off
can be switched off normally
can be switched on normally
can t be switched on by
hand or by motor
’
Check whether the signal is
normal

controller.
④ Ambient environment is ventilated.
① Confirm that there is no abnomality according to 10.1 before trial operation
② As for the draw-out circuit breaker, the main body should be in the position of “test”
③ The operating mechanism starts to be charged as it is electrified, “Charged/Discharged”
indicator is in the position of “ charged” , the under-voltage release has to be eletrified, the
window of ready-for-switching-on indicates “OK”, and the circuit breaker is switched on.
④ Press “Switching-on” button on the panel of the circuit breaker (switching on by hand)
or the panel of switchgear cabinet (switching on by motor), the circuit breaker should be switched on.
11.0 MAINTENANCE, EXAMINATION AND REPAIR
Caution:
11.1 MAINTENANCE
Before any maintenance and inspection, the following procedures should be carried out:
① Switch off the main circuit and the secondary circuit of the circuit breaker
② Switch off the breaker and check the spring of the operating mechanism is discharged
③ Pull the main body out of the draw-out socket for the draw-out circuit breaker
● Check whether the ambient environment can meet the general requirements
● Check whether all rubbing and movable parts are lubricated periodically
● Check whether the screw bolt for fixing the breaker with busbar is fixed firmly and whether
the contact is fine
● Check the state of dust piling up on the main body and insulation parts of the draw-out
socket, and cleaning on schedule
● Check whether the wiring terminals of secondary circuit are connected reliably
● Check whether the intelligent controller displays correctly
● Check whether protection features of the intelligent controller are set correctly
● Check whether ON/OFF indication is correct and reliable
·58·

When the right maintenance is carried out, the circuit breaker can have the following operating
performances in the table:
Frame current
1600
4000
6300
Rated Current
（A）
630
800
1000
1250
1600
2500
2500
2900
3200
3600
4000
Mechanical durability* (times)
Without
maintenance
15000
10000
10000
10000
10000
10000
30000
30000
30000
30000
30000
30000
30000
20000
20000
20000
20000
20000
10000
10000
10000
AC440V
6500
6500
6500
6500
6500
6500
6500
3000
3000
3000
3000
3000
3000
3000
1500
1500
1500
1500
1500
AC690V
1000
1000
1000
1000
1000
1000
1000
1000
·59·
2000
2500
630
800
1000
1250
1250
1600
1600
2000
2000
15000 30000
30000
30000
30000
30000
30000
30000
30000
30000
30000
6500
6500
6500
6500
6500
6500
5000
5000
5000
5000
3000
3000
3000
3000
3000
3000
2500
2500
2500
2500
200
400
4000
5000
6300
5000
5000
5000
800
800
800
With
maintenance
Electrical durability* (times)
11.2 EXAMINATION AND REPAIR
● Check whether all parts of the circuit breaker, such as the insulation parts of the framework,
footing, are integral and clean;
15000
15000
15000
15000
15000
15000
15000
15000
15000
15000
15000
15000
15000
15000
15000
*Note: For IEC60947-2,the term" durability"expresses the expectancy of number of operating cycles which can be
performed by the equipment before repair or replacement of parts.The consequent test is not intended to be
acceptance test for application by the user.

·60·
△
● Check whether the base of the breaker is fixed firmly. Should be no vibration in operation;
● Manual operating mechanism for the switching on/off of breaker should be moved flexibly
without being stuck. The switching of auxiliary contact of secondary circuit should operate reliably;
● Pull the slideway out or in by turning the rocker manually. The position of “ test”,
“separated” and “connected” should be clear and interlocking should be operated reliably
● When the secondary circuit is electrified, shunt, closing electro-magnet, under-voltage
release should operate in compliance with stipulations in technical manual of the breaker, power-
driven operating mechanism should operate normally;
● The contact system of the arc-chute chamber including contact tips should be complete,
silver coating layer should be in good condition, the arc-chute chamber should be cleaned up inside;
(Note: Don’t operate the mechanism when the arc-chute chamber is opened)
● The connection between the circuit breaker and busbar should be reliable and screw bolt
should be fastened;
● Check whether the surface of connector between the main body and the draw-out socket
should be clean and neat to ensure the reliable connection;
● Check the insulated resistance of the breaker with megohm meter of 1000VDC at the
ambient temperature of 20℃±5℃, and the resistance should not be less than 20MΩ under the
relative humidity of 50~70%;
● Check the setting values of protection features of the intelligent controller;
If the controller is electrified with DC 24V, check as follows:
Connect with the exclusive tester for Type L25 Controller, press the button “ select” to
choose the setting values to check. If the setting values want to be adjusted, please turn the knob.
○ For Type M25, M26 and H26 Intelligent Controller
Press the button “Set” and the corresponding setting values will display on LED screen. To
modify the setting values, press the button “△”/ ”, then press the button “mem” to save
the modifications.
Before the breaker is in operation again, check the setting parameters of the controller. At the
position of “test”, the secondary circuit is electrified or simulate tripping test with DC24V, make
sure that all simulated operations are correct before its regular operation. Check as follows:
○Type L25 Controller
1: Turn the knob “test” to choose the suitable test current (NхIr );
2: Wait two seconds after step 1, press the button “trip”, and then the controller will be
tested and the breaker will be switched off according to the protective curve.
○Type M25, M26 and H26 Controller
1: Press the button “set” to choose the phase current to test;
2: Press the button “△”/ ” to choose the suitable test current;
○ For Type L25 Intelligent Controller
“
○ For Type P25 and P26 controller
Press F3 ( protection setting ) to see the setting values of protection characteristics press
“enter”, press “ ”/“ ”to adjust the values and then press “enter”.
“
1
△

·61·
3: Press the button “trip” to do tripping test or press the button “non-trip” to do non-
tripping test;
4: When the test light is on, the controller is being tested. In terms of the test current value
within the operating range of LSI protection, the circuit breaker will be switched off (“trip”) or
(“non-trip”) only indicates on the panel according to the protective curve.
Caution: before replacing accessories, do as follows:
① Cut off all electrical sources including the power supply of the main circuit and the
secondary circuits.
② The circuit breaker is switched off and the charging mechanism is discharged.
③ Remove the front cover of the circuit breaker
The cover of the breaker should be installed after replacement of the accessories,the breaker
can only be operated ofter check.
11.3.1 Replacement of shunt release (f), closing electromagnet (x) and under-voltage release (q)
① Remove the cable connector connecting with shunt release, closing electromagnet and
under-voltage release from the wiring terminals of the secondary circuit
② Remove the connector connecting with closing electromagnet, and remove the cover of the
control panel of under-voltage release and then the panel.
③ Loosen the mounting screw on the plank of shunt release, closing electromagnet and under-
voltage release, and then remove the plank.
④ Remove the shunt release, closing electromagnet and under-voltage release
① Put back the shunt release, closing electromagnet and under-voltage release right onto the
appointed place.
② Place the plank and tighten the mounting screw.
③ Link up the closing electromagnet and ready-for-switching-on contact with the connector
put the control panel of the under-voltage inside its shell and cover it.
④ Connect the lead wires of shunt release, closing electromagnet and under-voltage release
with the corresponding wiring terminals of the secondary circuit, under which the lines and the
terminals have the same No.
○ P25、P26 Controller
1. Press F4 → test parameters, choose “I ”、“I ”or“I ”；
2. Set simulation current in the “Current value”；
3. Choose “non-trip”or “trip” in the “Type” to test
4. Press“ESC” and “Yes”to test.
1 N G
11.3 REPLACEMENT OF ACCESSORIES
1. Remove
2. Installation

·62·
12.0 COMMON FAULT AND SOLUTION
Below list the common fault of the circuit breaker in its installing, checking and operating, and
then list the possible reasons and solutions:
1
No. Technical problems
Trip (the light of fault
indication is on)
Possible reasons
● Over-load trip
(indication light for
long-time delay is on)
● Short-circuit trip
short-time delay or
instantaneous is on)
● Earthing fault trip
earthing fault is on)
● Under-voltage
release trip
● Operation of
mechanical interlock
1. Check the breaking current value and
operating time on the intelligent controller;
2. Analyze the operation of load and electric grid;
3. In case of overload, find out and eliminate the
fault at once;
4. If the actual operating current doesn't match
with long-time delayed operating current, please
modify the setting value of long-time delayed
operating current in terms of the actual operating
current to make the suitable protection;
5. Press the reset button and switch the breaker
on again.
2. In case of short-circuit, find out and eliminate
the fault at once;
3. Check the setting value of the intelligent
controller;
4. Check whether the breaker is in good condition
and can be switched on;
on again.
2. In case of earthing fault, find out and eliminate
the fault at once;
3. If there is no earthing fault, check whether the
setting vaule is reasonable and whether it can
match with the actual current of protective phase;
if it can't, modify the setting value of earthing
fault;
on again.
1.Check whether the voltage of power supply is
lower than 70% Us;
2.Check whether the under-voltage release and
control unit operate normally.
Check the operation of two pieces of breakers
installed with mechanical interlock
Inspection and solution

·63·
2
3
Trip after being
switched on
No. Technical problems Possible reasons
● Under-voltage
release unclosed
Unable to be
switched on
● Reset button
doesn't work
● Draw-out breaker
isn't in the right
place
● The secondary
circuit of draw-out
breaker isn't well
connected
● Trip at once
Delayed trip●
Inspection and solution
1. Check whether the under-voltage release is
electrified;
2. Check whether the voltage of power supply is
lower than 85% Us;
3. Check whether the under-voltage release and
control unit operate normally.
Press the reset button and switch the breaker on
again
Turn the draw-out socket to the right place
(locked in the position of “ connected” or
“test”)
Check the contact of the secondary circuit and
eliminate errors
● No charging
operation in advance
● The breaker is locked
because of the operation
of mechanical interlock
● Error for the closing
electromagnet
1. Check whether power supply for motor control
is on and not less than 85% Us;
2. Check whether motor-driven charging
mechanism operates normally
Check whether the interlock operation of two
pieces of breakers is in good condition
1. Check whether the power supply for the closing
electro-magnet is equal to 85% Us at least;
2. Check whether there is something wrong
with the closing electromagnet, replace it.
1. In case of short-circuit current while switching
the breaker on, find out the reason and eliminate
it;
2. Check the over-load current in the circuit and
eliminate it;
3. Check whether the operating mechanism of the
breaker is in good condition;
4. Check whether the setting value of the
intelligent controller is reasonable, modify it if
necessary;
on again.

·64·
4
Unable to be switched
on
5
Unable to be charged
6
7
8
No. Technical problems Possible reasons Inspection and solution
The main body can't
be pulled out in the
position of
“separated” for the
draw-out breaker
The draw-out breaker
can't be pushed into
the position of
connected“ ”
The screen on the
intelligent controller
can't display
●
“ ”
The breaker can't be
operated be remote controll
Unable to switch off the
breaker with the
switching-off button
●
● Unable to charge
manually
● Unable to charge by
motor
● The lock catch is not
pushed down;
●
●
The rocker is not pulled
out;
The breaker is not at the
position of complete
separation
● The turning mechanism
is stuck or the gear of the
mechanism is damaged due
to the falling objects
● The intelligent controller
is not electrified;
●
●
●
Input voltage of auxiliary
power supply is abnormal;
Secondary output voltage
of the socket transformer is
abnormal;
The connection between
the secondary output
terminal of the socket
transformer and the
controller is not reliable.
1. Check whether the connection of shunt release
circuit is reliable. In case of errors for the release,
replace it;
2. Check whether the operating mechanism is out
of mechanical failure.
1. Check whether the control voltage for the
power supply of motor-driven charging
mechanism should be not less than 85% Us and
whether the circuit is in good condition;
2. Check whether the motor is in good condition;
3. Errors for the charging mechanism.
Push down the lock catch
Pull out the rocker
Separate the main body from the breaker
completely
Check whether there are objects falling into the
mechanism and check the conditions of rack and
gear
1. Check whether the intelligent controller is well
electrified;
2. Cut off power supply for the intelligent
controller, then to be electrified. Should the errors
still appear, replace the intelligent controller.

·65·
9
10
Communication
error for Type H26、
P25、P26 Intelligent
controller
The screen on the
intelligent
controller displays
“ERR9”
● Extra high temperature
around the controller
To reduce the ambient temperature
13.0 ACCESSORIES
13.1 NECESSARY ACCESSORIES
○ Shunt Release
Rated Control supply voltage Us（V） AC400 AC230 DC220
Operational Voltage（V）（0.7～1.1）Us
Instantaneous Current（A） 0.7 1.3 1.3
Breaking Time（ms） No more than 30
▲ Switch the breaker off by remote control
▲ Features
For BT2 with frame current of 2000A and above
No. Technical problems Possible reasons Inspection and solution
● Communication cable
doesn't connect well with
wiring terminals
● Terminals A and B are
inversely wired
● Communication distance
and wiring ways can't meet
the requirements
● Errors for the setting of
communication address
1. Check whether the communication
cables connect well with wiring
terminals or there is wrong connection;
2. Check whether terminals A and B of
the communication cable are inversely
wired. If so, make the correction;
3. Check whether communication
distance and wiring ways can meet the
requirements;
4. Check whether the setting of
communication address is correct and
without conflict
For BT2-1600 Circuit Breaker
DC110
2.4

Rated Control supply voltage Us（V）
Rated Control supply voltage Us（V）
AC400 AC230 DC110
（0.85～1.1）Us
0.7 1.3 2.4
Switching-on Time（ms） No more than 70
After the circuit breaker is charged, the closing electromagnet will make the energy-charging
spring discharge instantly, and then switch the breaker on quickly.
Features
▲
▲
○ Closing electromagnet
·66·
AC400 AC230 DC220
（0.85～1.1）Us
Power Consumption 192VA 192W
Charging Time（s） No more than 5
▲ The circuit breaker has the functions of motor-driven energy-charging and automatic energy-
discharging.
▲ Energy charging can also be done manually.
▲ Features
○ Motor-driven Operating Mechanism
13.0 ACCESSORIES
Operational Voltage（V）
Instantaneous Current（A）
DC220
1.3
DC110

○ Auxiliary Switch
Rated Current
Rated operational Voltage（V） Conventional thermal current Ith（A） Rated capacity
AC
230
6
300VA
400
DC 220 60W
Note: For the standard type of auxiliary switch, there are four pairs of changeover contacts; for the special type,
there are four pieces of normally-opened contacts (NO) and four pieces of normally-closed contacts (NC),
or 6 pieces of NO and 2 pieces of NC, or 2 pieces of NO and 6 pieces of NC.
·67·
○ Safety padlock mechanism at the position of “separated”
13.0 ACCESSORIES
▲ When the draw-out circuit breaker is at the position of “separated”, the locking stick
can be locked with padlock after being pulled out so that the rocker of the circuit breaker can not be
turned to the position of “test” or “connected”.
▲ Padlock should be provided by users themselves.
Safety padlock mechanism at the position of “separated”

13.2 OPTIONAL ACCESSORIES
○ DC Power Module
·68·
○
▲
Power Module
When the power voltage of the intelligent controller is DC24V, AC230V or AC400V, it can be
transformed into DC24V by the power module to provide power supply for the intelligent controller.
Caution: Voltage input to secondary terminals 1 and 2 of BT2-1600 must be
DC24V.
▲ The module can be mounted to 35mm DIN rail inside the switchgear cabinet.
13.0 ACCESSORIES
When power supply of the secondary circuit is DC220V, it should be transformed into DC24V
by this module to provide power supply for the intelligent controller.

○ Under-voltage release
▲ The under-voltage release consists of release coil and control unit;
▲ The under-voltage release operates in two ways: operate instantaneously and operate in
time delay;
▲ There are four specifications of time delay for the under-voltage time delay release: 0.5s, 1s,
2s and 3s. Users should consult with the manufacturer in the light of their order about special time-
delay specifications as from 3s and above up to 9s. The time delay accurary is ±10%;
▲ The delay module should be additionally equipped for the under-voltage delay release. The
module input connects with the main circuit, and the output connects with the wiring terminals of 31
and 32 in the secondary circuit;
▲ If the voltage of power supply returns to 85% Us and above in half of the delay time, the
circuit breakers will not break. The module is stuck into the standard slideway of 35mm in width.
▲ Features
（0.35～0.7）Us
（0.85～1.1）Us
≤0.35Us
12VA
AC400Rated control supply voltage Us（V） AC230
Reliable Switching-on Voltage（V）
Reliable Switching-on Resistant Voltage（V）
Power Consumption
·69·
Delay Module of Under-voltage
delay release for BT2-1600
In connection with the main circuit
In connection with the terminals of
31 and 32 in the secondary circuit
Under-voltageTime-delayModule
AC230V
INPUT
13.0 ACCESSORIES
Fuju Electric FA
0.5s 1s 2s 3 s
OUTPUT
input
output

·70·
○Components of draw-out socket communication module
▲ The components of draw-out socket communication
.module consists of the external communication module and the
internal communication parts of the circuit breaker. The draw-out
socket communication parts are installed inside of the draw-out
socket to provide the status signals of such three positions as
“separated”, “test” and “connected” of the main body of
the draw-out circuit breaker and the draw-out socket.The draw-
out socket communication module, which can provide the
function of reading the address of the circuit breaker and display
the status indication of the main body and three positions of the
draw-out socket etc, mounted onto 35mm DIN rall inside the
switchgear cabinet. The two parts of the draw-out socket
communication module are connected with flexible wires.
○Electrical mechanism for the indication of draw-out socket's position
▲When the main body of the draw-out circuit breaker and the draw-out socket are at the
position of “separated”, “test” and “connected” respectively, three electrical mechanisms
for the indication of draw-out socket’ s location can output the electrical signals corresponding
with three positions above respectively. These mechanisms are installed inside the draw-out socket.
▲ Features
Rated operational Voltage Ue（V） 230
Conventional Thermal Current Ith（A） 10
Rated Operational current Ie（A） 1.5
13.0 ACCESSORIES
▲
’ ’
’
Communication module is optional accessories of draw-out breaker. Connect: A to RS485
A; B to RS485 B; S to RS485 SH; - to cathode of DC24V; + to anode of DC24V; A to 8, B to 10,
S to 12; for BT2-1600, T1 to 61, T2 to 62, T3 to 63, T4 to 64; for BT2-2000 or above, T1 to Y5,
T2 to Y6, T3 to Y7, T4 to Y8.
By pressing “Read Address” button after address setting, the communication module will
save the communication address and the address will be changed accordingly. If users want to keep
the former address after changing breakers, press “write Address” button. The power lamp will
light on when DC24V power supply is given to the module. The communication lamp will light on

○ Electrical module for indication of ready-for-switching-on
230
10
1.5
▲This electrical module indicates that the circuit breaker is ready for switching-on.
▲ Features
·71·
13.0 ACCESSORIES
Rated operational Voltage Ue（V）
Conventional Thermal Current Ith（A）
Rated Operational current Ie（A）
when there's data transmission. Fault lamp will light on when the detected address is not complied
with the module address or no breaker is connected with the module. After powering up for the
module or modification of communication address, check mode or baud rate by upper devices, the
module will scan the addresses for several minutes during which the communication between the
module & upper device and between breaker & upper devices will be interrupted.
○ Ready-for-switching-on signal: Ready-for-switching-on information could be got by
upper devices.
○Under-voltage signal: Informations of trip caused by under-voltage could be got by upper
devices.
○Fault-trip signal:Informations of trip caused by overload, short-circuit or ground, etc. could
be got by upper devices.
○Current mutual inductor with neutral line N connected externally
▲This current mutual inductor, which is used together with circuit breakers with three poles
in the power distribution system of TN-S, installed in the neutral line N with 2m at maximum far
from the installation point.
○Steel cable interlock between two pieces of flush circuit breakers or linking rod interlock
between two pieces of stacked circuit breakers

·72·
13.0 ACCESSORIES
○ （）Linking rod interlock between three pieces of stacked circuit breakers without BT2-1600
0
1QF 2QF 3QF
1QF 3QF
0
0
0
0
1
1
1
0
2QF
0
0
0
0
1QF 2QF 3QF
1QF 3QF
0
0
0
0
1
11
1
0
2QF
0
0
1QF 2QF 3QF
0 10
00
1QF 3QF
0
0
0
0
1
1
1
0
2QF
0
0
01 1
0 11
110
Pattern three: two sets of power supply plus one
piece of coupling busbar
Pattern two: two sets of common power supply plus
one set of standby power supply
Pattern one: three sets of power supply can only
switch off one piece of circuit breaker.
180
180
Wiring Diagram Possible operation patterns
Circuit
Breaker 1
Circuit
Breaker 2
Circuit
Breaker 3
Breaker base
Base point
2m Max.
Wiring Diagram Possible operation patterns
1QF 2QF
1QF 2QF
0
1
0
0
1 0
Circuit Breaker 1 Circuit Breaker 2
600~700
600~700

○ “opened” lock mechanism
opened“ ” lock mechanism
▲“opened” lock mechanism can lock
the “OFF” button of the circuit breaker on
the pressed position. As a result, the circuit
breaker can not be switched on.
▲After this lock mechanism was chosen
by users, the manufacturer would provide lock
and key.
△One set of circuit breaker is outfitted
with one lock and one key.
△ Two sets of circuit breakers are
outfitted with two same locks and one key.
△ Three sets of circuit breakers are
outfitted with three same locks and two keys.
13.0 ACCESSORIES
Steel cable interlock
Refer to the interlock mode of 2 breakers for steel cable interlock of 3 breakers max. Space
2m.
1QF 2QF 3QF
00
1QF 3QF
0
0
0
0
1
1
1
0
2QF
0
0
01 1
0 11
110
2 supply and 1 segmentation
Circuit diagram Possible operation mode
·73·

13.0 ACCESSORIES
○ Button locking device
Preventing from operating switching-on/off button by mistake.
Pad lock should be provided by user.
○ Counter
Counting mechanical operation times accumulatively, clear at a glance.
○ Separator plate between phases
Strengthening insulation between bus-bars; optional according to users' demand.
○ Voltage conversion module
If voltage display function is selected, voltage conversion module will be provided as a
standard configuration. Input terminal is connected be the main circuit while output to the
secondary input Terminal 17, 18, 19, 20 of breakers.
·74·

14.0 OUTLINE DIMENSIONS AND INSTALLATION DIMENSIONS
● BT2-1600 Intelligent Air Circuit Breaker with three poles (Draw-out type)
70 70
25 50
38 150 60
Outside of the
cabinet door
“ ” positionSeparated
Horizontal (rear connected)
A
51
D
72.5 102.5
297
77.5
46
L mm（）
200A,400A,
630A
10
800A,1000A,
1250A,1600A
Current
specifications
15
2-Φ6.5
2-6.5×8.5
51
72.5 102.5
297
77.5
46
15
12-Φ11
70 70
L
12-Φ11
C
·75·
86
Outside of the
cabinet door
Direction A
Base point
Direction D
Base point
Direction C
Vertical ( )rear connected

·76·
● BT2-1600 Intelligent Air Circuit Breaker with four poles (Draw-out type)
57 60201
A
51
D
72.5 102.5
297
77.5
46
2-Φ6.5
2-6.5×8.5
51
72.5 102.5
297
77.5
46
15
16-Φ11
70 70
L
70
70 70
25 50
70
16-Φ11
C
102
L mm（）
200A,400A,
630A
10
800A,1000A,
1200A,1600A
Current
specifications
15 Direction A
N pole
Outside of the
cabinet door
Horizontal ( )rear connected
Base point
Outside of the
cabinet door
Direction D
Base point
Direction C
N pole

● BT2-1600 Intelligent Air Circuit Breaker with three poles (fixed type)
L mm（）
200A,400A,
630A
10
800A,1000A,
1200A,1600A
Current
specifications
15
70
12-Φ11
70
50
25
32
4-Φ6.5
100
192
197
38.5 50.6
A
10 234 10
32
4-Φ6.5
100
192
197
38.5 50.6
C
4-Φ6.5
214
234
244
4-Φ6.5
15
Direction A
Outside of the
cabinet door
Outside of the
cabinet door
70 70
L
Direction C
Base point
Breaker base
Base point
Aperture dimensions of the back plate
at the time of hanging type installation
·77·

● BT2-1600 Intelligent Air Circuit Breaker with four poles (fixed type)
70 70 70
25
50
16-Φ11
10 10304
4-Φ6.5
32
4-Φ6.5
100
192
197
38.5 50.6
A
284
304
314
Aperture dimensions of the back plate
at the time of hanging type installation
4-Φ6.5
32
4-Φ6.5
100
192
197
38.5 50.6
C
70 70
L
15
70
Direction A
Outside of the
cabinet door
Base point
Outside of the
cabinet door
Direction C
Breaker base
N pole
N pole
Base point
L mm（）
200A,400A,
630A
10
800A,1000A,
1200A,1600A
Current
specifications
15
·78·

·79·
95
24-Φ11
95
30 70
41 265 41
A
61
D
10
97 175
390
102
47
24-Φ11
C
97 175
102
390 66
30 15
60
60
30
10
95 95
10
47
L mm（） H mm（）
2000A 20 20
630A 800A
1000A,1250A
1600A
，
15 15
A mm（）
30
25
2-Φ14
11×17
Φ11
Current
specifications
Direction A
Outside of the
cabinet door
Base point
Outside of the
cabinet doorDirection D
Base point
Direction C

L mm（） H mm（） A mm（）
Current
specifications
·80·
95
30 70
32-Φ1195 95
41 360 41
10
97 175
102
39047
D
A
61
32-Φ11
C
97 175
102
390 66
30 15
60
10
47
60
30
10
95 9595
N极
2-Φ14
11×17
Φ11
2000A 20
630A 800A
1000A,1250A
1600A
，
15
30
25
20
15
Direction A
N pole
Outside of the
cabinet door
Base point
Outside of the
cabinet door
Base point
Direction D
Direction C

·81·
1111 340
A
150 69.5
285
290
61
95
24-Φ11
95
30 60
150 69.5
285 94
3015
24-Φ11
60
60
30
10
95 95
BT2-2000 Intelligent Air Circuit Breaker with three poles (Fixed type)●
L
mm（）
W
mm（）
B
mm（）
2000A 20 20 13
630A 800A
1000A,1250A
1600A
，
15 15 3
A
mm（）
269
264
C
Current
specifications Direction A
Outside of the
cabinet door
Base point
Base point
Outside of the
cabinet door
Base point
Direction C

·82·
95 95 95 32-Φ11
30 60
435 1111
61
A
150 69.5
285
290
150 69.5
285 94
3015
32-Φ11
60
60
30
10
95 9595
C
● BT2-2000 Intelligent Air Circuit Breaker with four poles (Fixed type)
L
mm（）
W
mm（）
B
mm（）
2000A 20 20 13
630A 800A
1000A,1250A
1600A
，
15 15 3
A
mm（）
269
264
Current
specifications
Direction A
Outside of the
cabinet door
Base point
Base point
N pole
Outside of the
cabinet door
Direction C
Base point
N pole

·83·
41 265 41
A
62
D
10
97 175
390
102
47
97 175
102
390
10
47
L mm（）
2000A 2500A， 20
1250A 1600A， 15
2-Φ14
11×17
Φ11
95
30 70
24-Φ11
95
62
24-Φ11
C
95 95
L
Current
specifications Direction A
Outside of the
cabinet door
Base point
Outside of the
cabinet door
Base point
Direction D
Direction C

·84·
41 360 41
10
97 175
102
39047
D
A
62
2-Φ14
11×17
Φ11
L mm（）
20
15
2000A 2500A，
1250A 1600A，
97 175
102
390
10
47
62
32-Φ11
C
95 95
L
95
N极
Current
specifications
Outside of the
cabinet door
95
30 70
32-Φ11
95 95
Direction A
N pole
Outside of the
cabinet door
Base point
Direction D
Direction C
Base point

1111 340
A
150 69.5
285
290
61
95
24-Φ11
95
30 60
● BT2-2500 Intelligent Air Circuit Breaker with three poles (Fixed type)
·85·
L
mm（）
20
15
2000A 2500A，
1250A 1600A，
C
mm（）
132
134.5
Current
specifications
Direction A
Outside of the
cabinet door
Base point
Base point
95 95 95 32-Φ11
30 60
435 1111
61
A
150 69.5
285
290
● BT2-2500 Intelligent Air Circuit Breaker with four poles (Fixed type)
Direction A
N pole
Outside of the
cabinet door
Base point
Base point
L
mm（）
20
15
2000A 2500A，
1250A 1600A，
C
mm（）
132
134.5
Current
specifications

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