1. 1
Medium-Voltage
Switchgear
Circuit-Breaker Switchgear Type NXAIR: Factory-Assembled, Type-Tested
and Metal-Enclosed Switchgear for Indoor Installation, Air-Insulated
Loss of Service Continuity Category: LSC 2B (Metal-Clad)
Partition Class PM (Metallic Partition)
Internal Arc Classification: IAC A FLR, ISC
= 40 kA, t = 1s Arc Duration
FIRST LINE OPERATION
& MAINTENANCE
TRAINING COURSE
Order No.: 110-0134.9
8BX3300-0LA00-0AB1
Revision: 05 Issue: 14.12.2011

2. 2
About these Instructions
These instructions do not purport to cover all details or variations in equipment, nor to
provide for every possible contingency to be met in connection with operation. For details
about technical design and equipment like e.g. technical data, secondary equipment, circuit
diagrams, please refer to the order documents. The switchgear is subject to continuous
technical development within the scope of technical progress. If not stated otherwise on the
individual pages of these instructions, we reserve the right to modify the specified values
and drawings. All dimensions are given in mm’s.
For further details, e.g. about additional equipment, please refer to catalog HA 25.71.
Should further information be desired or should particular problems arise which are not
covered sufficiently by these instructions, the matter should be referred to the competent
Siemens department.
The contents of this instruction manual shall not become part of or modify any prior or
existing agreement, commitment or relationship. The Sales Contract contains the entire
obligations of Siemens. The warranty contained in the contract between the parties is the
sole warranty of Siemens. Any statements contained herein do not create new warranties
or modify the existing warranty.
Medium-Voltage
Switchgear

3. 3
Contents
Safety instructions .................................................................................... 4
1 Signal terms and definitions ................................................ 4
2 General instructions ............................................................ 4
3 Due application .................................................................. 5
4 Qualified personnel ............................................................. 5
Description ................................................................................................. 6
5 Features................................................................................ 6
6 Panel types........................................................................... 7
6.1 Circuit-breaker panel ................................................ 7
6.2 Disconnecting panel……............................................8
6.3 Metering panel.......................................................... 8
6.4 Bus sectionalizer....................................................... 9
6.5 Contactor panel......................................................... 9
7 Panel design......................................................................... 10
8 Interlocks ............................................................................. 12
9 Accessories ......................................................................... 13
10 Technical data……..…………...................................................14
10.1 Complete switchgear................................................. 14
10.2 Operating conditions.................................................. 18
10.3 Vacuum circuit-breaker type 3AE ….......................... 19
10.4 Contactor type 3TL6 .................................................. 19
10.5 Operating instructions for circuit-breaker type 3AE &
contactor type 3TL6 .................................................. 20
11 Service information .................................................................. 21
11.1 Maintenance.................................................................21
11.2 Visual inspection ........................................................ 21
11.3 Preventive maintenance ............................................ 23
11.4 Switchgear extension ................................................ 24
11.5 Spare part orders....................................................... 24
11.6 Replacement of panels and components....................25
11.7 Disposal .................................................................... 25
Operation NXAIR .................................................................................. 26
12 Safety instructions.............................................................. 26
13 Panel operation....................................................................27
13.1 Control elements at the front side of the panel ........ 27
13.2 Access to compartments ......................................... 29
13.3 Operating tools ........................................................ 30
13.4 Opening and closing the high-voltage door.............. 34
13.5 Racking the circuit-breaker to service position ….... 40
13.6 Racking the circuit-breaker to test position ............. 43
13.7 Racking the V.T. unit to service position ................. 46
13.8 Racking the V.T. unit to test position ....................... 49

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13.9 Racking the contactor to service position ................... 52
13.10 Racking the contactor to test position ....................... 55
13.11 Closing the circuit-breaker...........................................58
13.12 Opening the circuit-breaker ....................................... 60
13.13 Charging the spring manually......................................61
13.14 Closing or opening the contactor.................................63
13.15 Applying the Feeder earth.......................................... 64
13.16 Removing the Feeder earth.........................................67
13.17 Applying the Busbar earth.......................................... 69
13.18 Removing the Busbar earth.........................................72
13.19 Access to the cable compartment ............................. 74
13.20 Removing the circuit-breaker, discon-link and/or metering
unit out of the panel ................................................... 79
13.21 Inserting the circuit-breaker, discon-link and/ or metering
unit in a panel............................................................ 84
13.22 Removing the V.T unit from the panel ....................... 89
13.23 Inserting the V.T. unit into the panel........................... 93
13.24 Removing the contactor from the panel ..................... 96
13.25 Inserting the contactor into the panel ......................... 99
13.26 Emergency operation of the feeder earth-switch without
the circuit-breaker being inserted in the panel........... 103
13.27 Verification of safe isolation from the supply ……...... 104
13.28 Connecting the earthing and short-circuiting facility....108
13.29 Manual operation of shutters in circuit-breakers, discontrs.
and metering panels....................................................109
13.30 Manual operation of shutters in the contactor panel . 112
13.31 Application of HVHRC fuse-links in contactor panel . 117
13.32 Motor starting currents............................................... 120
13.33 Coordinating components of the motor circuit …....... 121
13.34 HVHRC fuse-links of the V.T. unit...............................123
13.35 Key-operated interlocking.......................................... 126
14 Trouble shooting......................................................................132
Index.............................................................................................................133

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DANGER!
As used in these instructions, this means that personal injuries can occur if the
relevant precautionary measures are not taken or observed or a risk assessment has
not been carried out.
 Observe the safety instructions.
ATTENTION!
As used in these instructions, this means that damage to property or environment can
occur if the relevant precautionary measures are not taken.
 Observe the safety instructions.
Safety instructions
1 Signal terms and definitions
Symbols used:  Operation symbol:
 Identifies an operation.
 Asks the operator to perform an operation.
 Result symbol:
 Identifies the result of an operation.
2 General instructions
Independently of the safety instructions given in these operating instructions, the local laws, ordinances,
guidelines and standards for operation of electrical equipment as well as for labor, health and
environmental protection apply.
Any kind of modification on the product or alteration of the product must be coordinated with the
manufacturer in advance, as uncoordinated modifications or alterations can cause the expiration of
warranty claims, cause danger to life, limb and other legally protected interests, and the fulfillment of the
type tests (according to IEC 62271-200) may not be guaranteed anymore.
NOTE!
As used in these instructions, this points at facilitations of work, particularities for
correct operation, or warning covering possible mal-operation.
 Observe the steps of the safe operation and all safety instructions.

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DANGER!
The perfect and safe operation of this switchgear is conditional on:
 Observance of operating and installation instructions.
 Qualified personnel.
 Proper transportation and correct storage of the switchgear.
 Correct installation and commissioning.
 Diligent operation and maintenance.
 Observance of the instructions applicable at site for installation, operation and
safety.
The edition of the standard is only mentioned in the test report applicable at the time of switchgear
manufacture. Five Safety Rules of The Five Safety Rules of Electrical Engineering must generally be
observed during operation of Electrical Engineering the products and components described in these
operating instructions:
 Isolate.
 Secure against reclosing.
 Verify safe isolation from supply.
 Earth and short-circuit.
 Cover or barrier adjacent live parts.
3 Due application
The switchgear corresponds to the relevant laws, prescriptions and standards applicable at the time of
delivery. If correctly used, they provide a high degree of safety by means of logical mechanical interlocks and
shockproof metal enclosure of live parts.
4 Qualified personnel
Qualified personnel in accordance with these instructions are persons who are familiar with maintenance and
operation of the product and have appropriate qualifications for their work.
Furthermore, qualified personnel must have the following training and instruction or authorization:
 Training and instruction or authorization to switch on, switch off, earth and identify power circuits and
equipment / systems as per the relevant safety standards.
 Training and instruction regarding the applicable specifications for the prevention of accidents and
the care and use of appropriate safety equipment.
 Training in first aid and behavior in the event of possible accidents