Specifications, Formulae, Tables
Circuit symbols, European – North America

Circuit symbols to DIN EN, NEMA ICS [t-head1-first]

The following comparison of circuit symbols is based upon the following international/national specifications:

  • DIN EN 60617-2 to DIN EN 60617-12
  • NEMA ICS 19-2002

Description
 
DIN EN
 
NEMA ICS
Conductors, connectors
Junction of conductors
 
or
 
or
Connection of conductors (node)
Terminal
Terminal strip/block
Conductor
Conductor (for later expansion)
 
 
 
Line of application, general symbol
Line of application, optional, denoting small interval
Separation between two fields
Line of separation between functional units
Screen
Earth, general symbol Ground, general symbol
Protective earth Protective ground
Connector with plug and socket
 or 
Isolating point, lug, closed
Passive components
Resistor, general symbol
 
or
 
 
or
Resistor with fixed tappings
or
Variable resistor, general symbol
Adjustable resistor
Resistor with sliding contact, potentiometer
 
Winding, inductance, general symbol
or
 
Winding with fixed tapping
Capacitor, general symbol
or
 
 
or
Variable capacitor
 
Signalling units
Visual indicator, general symbol
 
 
 
*with colour stated
Indicator light, general symbol
or or
 
 
*with colour stated
Buzzer
or
 
 
Horn, claxon
Operating devices
Manual operation, general use
 
 
Operated by pushing
Operated by pulling
Operated by turning
 
Operated by key
 
Operated by rollers, sensors
 
Stored energy mechanism, general symbol
 
 
 
Switch mechanism with mechanical release
 
Operated by motor
Emergency switch
 
Operated by electromagnetic overcurrent protection
 
Operated by thermal overcurrent protection
Electromagnetic operation
Control by fluid level
Electromechanical, electromagnetic operating devices
Electromechanical operating device, general symbol, relay coil, general symbol
 
 
or or
 
× device code letter
Operating device with special features, general symbol
Electromechanical operating device with On-delay
 
 
Electromechanical device with Off-delay
Electromechanical device with On- and Off-delay
Electromechanical device of a thermal relay
Contacts
Make contact
 
or
 
 
 
or
Break contact
or
Changeover contact with interruption
or
Early-make contact of a contact assembly
Late-break contact of a contact assembly
Make contact, delayed when closing
 
or
 
 
 
Break contact, delayed when reclosing
or
 
 
Control devices
Push-button (not stay-put)
 
 
Spring-return switch with break contact, manually operated by pushing, e.g. push-button
Spring-return switch with make and break contacts, manually operated by pushing
Spring-return switch with latching position and one make contact, manually operated by pushing
Spring-return switch with latching position and one break contact, manually operated by striking (e.g. mushroom button)
 
Position switch (make contact)
Limit switch (make contact)
Position switch (break contact)
Limit switch (break contact)
Spring-return switch with make contact, mechanically operated, make contact closed
 
Spring-return switch with break contact, mechanically operated, break contact open
 
 
 
Proximity switch (break contact), actuated by the proximity of iron
Proximity switch, inductive, make contact
Proximity switch, block diagram
 
Under-pressure relay, make contact
or
Pressure switch, break contact
or
Float switch, make contact
Float switch, break contact
Switchgear
Contactor (make contact)
 
 
 
 
× code letter
3 pole contactor with bimetal relay (3 thermal elements)
 
 
 
 
× code letter
3 pole switch-disconnector
3 pole circuit-breaker
3 pole breaker with switch mechanism with three thermoelectric overcurrent releases, three electromagnetic overcurrent releases, motor-protective circuit-breaker
Fuse, general symbol
or or
Transformers, current transformers
Transformers with two windings
 
or
 
or
 
Autotransformer
 
or
 
 
 
 
or
Current transformer
or
 
 
 
Machines
Generator
 
 
or
Motor, general symbol
or
DC motor, general symbol
AC motor, general symbol
Three-phase asynchronous motor with squirrel-cage rotor
Three-phase asynchronous motor with slip-ring rotor
Semiconductor components
Static input
 
 
Static output
Static input with negation
Static output with negation
Dynamic input, change of status from 0 to 1 (L/H)
 
Dynamic input with negation, change of status from 1 to 0 (H/L)
 
AND gate, general symbol
OR gate, general symbol
NOT gate, inverter
AND with negated output, NAND
OR with negated output, NOR
 
 
Exclusive OR gate, general symbol
RS flip-flop
Monostable gate, cannot be triggered during the output pulse, general symbol
Delay, variable with indication of delay values
Semiconductor diode, general symbol
Limiting diode Zener diode
Light-emitting diode (LED), general symbol
Bi-directional diode, diac
Thyristor, general symbol
PNP transistor
 
 
or
NPN transistor, in which the collector is connected to the enclosure
or

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