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Circuit symbols to DIN EN, NEMA ICS/ANSI/IEEE/CSA [t-head1-first]
The following comparison of circuit symbols is based upon the following international/national specifications:
| Description
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IEC (DIN EN)
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NEMA ICS/ANSI/IEEE
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|---|---|---|---|---|
| Conductors, connectors
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| Junction of conductors
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 or  |
 or  |
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| Connection of conductors (node)
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| Terminal
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| Terminal strip/block
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| Conductors
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| Conductor (for later expansion)
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| Line of application, general symbol
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| Line of application, optional, denoting small interval
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| Separation between two fields
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| Line of separation between functional units
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| Shielding
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| Earth, general symbol Ground, general symbol
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| Protective earth Protective ground
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| Connector with plug and socket
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 or  |
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| Isolating point, lug, closed
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| Passive components
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| Resistor, general symbol
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 or  |
 or  |
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| Resistor with fixed tappings
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 or  |
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| Variable resistor, general
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| Adjustable resistor
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| Resistor with sliding contact, potentiometer
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| Winding, inductance, general
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 or  |
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| Winding with fixed tapping
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| Capacitor, general symbol
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 or  |
 or  |
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| Variable capacitor
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| Control circuit devices
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| Visual indicator, general symbol
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 *with colour stated
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| Indicator light, general symbol
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 or  or *with colour stated
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| Buzzers
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 or  |
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| Horn, claxon
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| Drives
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| Manual operation, general use
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| Operated by pushing
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| Operated by pulling
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| Operated by turning
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| Operated by key
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| Operated by rollers, sensors
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| Stored energy mechanism, general symbol
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| Switch mechanism with mechanical release
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| Operated by motor
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| Emergency switch
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| Operated by electromagnetic overcurrent protection
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| Operated by thermal overcurrent protection
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| Electromagnetic operation
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| Control by fluid level
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| Electromechanical, electromagnetic operating devices
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| Electromechanical operating device, general symbol, relay coil, general symbol
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 or  or  × device code letter → table
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| Operating device with special features, general symbol
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 or  or  × device code letter → table
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| Electromechanical operating device with On-delay
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 or  or  × device code letter → table
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| Electromechanical device with Off-delay
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 or  or  × device code letter → table
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| Electromechanical device with On- and Off-delay
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 or  or  × device code letter → table
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| Electromechanical device of a thermal relay
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 or  |
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| Contacts
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| N/O contact
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 or  |
 or  |
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| N/C contact
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 or  |
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| Changeover contact with interruption
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 or  |
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| Early-make N/O contact of a contact assembly
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 TC or TDC |
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| Late-break N/C contact of a contact assembly
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 T0 or TD0 |
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| N/O contact, delayed when closing
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 or  |
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| N/C contact, delayed when reclosing
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 or  |
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| Control devices
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| Push-button (not stay-put)
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| Spring-return switches with N/C contact, manually operated by pushing, e.g. push-button
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| Spring-return switches with N/O and N/C contacts, manually operated by pushing
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| Spring-return switches with latching position and one N/O contact, manually operated by pushing
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| Spring-return switches with latching position and one N/C contact, manually operated by striking (e.g. mushroom button)
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| Position switches (N/O contacts)
Limit switches (N/O contacts)
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| Position switches (N/C contacts)
Limit switches (N/C contacts)
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| Spring-return switches with N/O contacts, mechanically operated, N/O contacts closed
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| Spring-return switches with N/C contacts, mechanically operated, N/C contacts open
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| Proximity switches (N/C contacts), actuated by the proximity of iron
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| Proximity switches, inductive, N/O contacts
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| Proximity switches, block diagram
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| Under-pressure relays, N/O contacts
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 or  |
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| Pressure switches, N/C contact
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 or  |
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| Float switches, N/O contact
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| Float switches, N/C contact
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| Switchgear
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| Contactors (N/O contacts)
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 × code letter
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| Three-pole contactor with bimetal relay (3 thermal elements)
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 × code letter
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| Three-pole switch-disconnector
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| Three-pole circuit-breaker
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| Three-pole breaker with switch mechanism with three thermoelectric overcurrent releases, three electromagnetic overcurrent releases, motor-protective circuit-breaker
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| Fuse, general symbol
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| Transformers, current transformers
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| Transformers with two windings
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 or  |
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| Autotransformer
|
 or  |
 or  |
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| Current transformer
|
 or  |
 or  |
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| Machines
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| Generator
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 or  |
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| Motor, general symbol
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 or  |
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| DC motor, general symbol
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| AC motor, general symbol
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| Three-phase asynchronous motor with squirrel-cage rotor
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 or  |
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| Three-phase asynchronous motor with slip-ring rotor
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| Semiconductor components
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| Static input
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| Static output
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| Static input with negation
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| Static output with negation
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| Dynamic input, change of status from 0 to 1 (L/H)
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| Dynamic input with negation, change of status from 1 to 0 (H/L)
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| AND gate, general symbol
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| OR gate, general symbol
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| NOT gate, inverter
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| AND with negated output, NAND
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| OR with negated output, NOR
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| Exclusive OR gate, general
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| RS flip-flop
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| Monostable gate, cannot be triggered during the output pulse, general symbol
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| Delay, variable with indication of delay values
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| Semiconductor diode, general symbol
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| Limiting diode Zener diode
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| Light-emitting diode (LED), general symbol
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| Bi-directional diode, diac
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| Thyristor, general symbol
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| PNP transistor
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 or  |
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| NPN transistor, in which the collector is connected to the enclosure
|
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 or  |
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