This document provides a summary of common ANSI and IEC electrical and electronic symbols used in industrial control and safety applications. It lists various contactor, relay, timer, solenoid, counter, circuit breaker, fuse, switch, and terminal symbols along with their corresponding ANSI and IEC codes and brief descriptions. The symbols are standardized in ANSI/NFPA79 and ANSI Y32.2/IEEE 315 and are used to diagram control and safety systems visually.

1. V I S I O N
iKnow
S A F E T Y Training Note: ANSI/IEC Symbols*
ANSI ANSI IEC 617 IEC ANSI ANSI IEC 617 IEC
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Description Description
Symbol Code Symbol Code Symbol Code Symbol Code
CON KM Contactor contact open LT HL Indicating light
W I R E L E S S
CON KM Contactor contact closed PL XS Plug and socket
CR KA Relay contact open CR KA Control relay coil
CR KA Relay contact closed CON KM Contactor coil
TR KT Timed contact, N.O. – ON-delay (TDE) M KM Motor starter coil
TR KT Timed contact, N.C. – ON-delay (TDE) TR KA Timer coil
TR KT Timed contact, N.C. – OFF-delay (TDD)
SOL YV Solenoid coil
TR KT Timed contact, N.O. – OFF-delay (TDD)
CTR EC Electromechanical counter
SS SA Selector switch
CB QF Circuit breaker
PB SB Pushbutton N.O.
X1 Terminals (reference)
PB SB Pushbutton N.C. T1
XT Fused terminals (reference)
PB SB Pushbutton mushroom head FU FU Fuse, protective
FL SL Liquid level switch
Mechanically-linked (force-guided) contacts
FLS SF Flow switch
PS SP Pressure switch E-Stop Emergency Stop button (mushroom head)
Positive opening operation of a switch
TS ST Temperature switch
LS SQ Limit switch Positive opening, latching with twist to reset
*From ANSI/NFPA79 and ANSI Y32.2/IEEE 315
PRS SQ Proximity switch
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