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Relay Symbols and Electromagnets

The relay are switching devices activated by signals. Most of the time, a small voltage or current is used to switch other voltages or higher currents that may be electromechanical or fully electronic type.
The electromagnetic controls are activated thanks to electromagnetic fields generated by electricity.

Symbology of Relays and Electromagnets

Symbol Description Symbol Description
Relay symbol / solenoid operated Relay / solenoid operated
(Coil and Switch)
Generic symbol
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  Relay symbol / solenoid operated Relay / solenoid operated
Relay symbol / solenoid operated Relay / solenoid operated   Relay symbol with push button Relay / solenoid operated
Coil and pushbutton
Relay (Coil) symbol Relay (Coil)
Generic symbol
  Relay (Coil) symbol Relay (Coil)
Generic symbol
Relay symbol Relay   Double coil relay symbol Double coil relay
Double coil relay symbol Double coil relay   Symbol of relay windings in opposite directions Two operating relay windings in opposite directions
Double coil relay symbol Double coil relay   Overcurrent relay symbol Overcurrent relay
Fast deactivation relay symbol Fast deactivation relay   Differential current relay symbol Differential current relay
Slow excitation relay symbol Slow excitation relay   Slow deactivation relay symbol Slow deactivation relay
Symbol of High speed relay, for both the connection and the disconnection High speed relay, for both the connection and the disconnection   Maximum voltage relay symbol Maximum voltage relay
Fast relay symbol Fast relay   Symbol of relay actuated by defective voltage Relay actuated by defective voltage
Card operated relay symbol Card operated relay   Relay not affected by AC symbol Relay not affected by AC
Differential relay symbol Differential relay   Polarized relay symbol Polarized relay
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Magnetically polarized relay symbol Magnetically polarized relay   Delayed action relay on disconnection symbol Delayed action relay on disconnection
Electromagnetic relay symbol Electromagnetic relay   Thermal relay symbol Thermo-relay
Thermal relay
Electronic relay / Solid-state relay symbol Solid-state relay
Electronic relay
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  Stepping or pulse relay symbol Stepping or pulse relay
Symbols of remote control relay Remote control relay   Pulse relay symbol Pulse relay
Remnant relay symbol Remnant relay   Intermittent relay symbol Intermittent relay
Relay remnant symbol Relay remnant   Electric valve / Solenoid valve symbol Electric valve / Solenoid valve
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AC relay symbol AC relay   Relay rest with delayed operation symbol Relay rest with delayed operation
Relay mechanical resonance symbol Relay mechanical resonance
e.g. 25Hz
  Step relay symbol Step relay
Mechanical interlock relay
Reed switch / Reed relay symbol Reed relay / Reed switch
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Measuring Relays Symbols

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Maximum voltage relay symbol Maximum voltage relay   Minimun voltage relay symbol Minimun voltage relay
Low impedance relay symbol Low impedance relay   Relay of voltage absence symbol Relay of voltage absence
Detection relay with divided conductor symbol Detection relay with divided conductor   Low power relay symbol Low power relay
Symbol of Detector relay of short-circuit between coils Detector relay of short-circuit between coils   Reverse current relay symbol Reverse current relay
Detector relay of failure in tri-phasic lines symbol Detector relay of failure in tri-phasic lines   Relay maximum and minimum current symbol Maximun and minimun current relay
Relay blocked rotor symbol Relay blocked rotor   Frequency relay symbol Frequency relay
Automatic reclosing relay symbol Automatic reclosing relay   Symbol of the overcurrent relay with two measuring elements and a range of sample Overcurrent relay with two measuring elements and a range of sample
e.g. 1...5A sample range
Overcurrent relay with delayed action symbol Overcurrent relay with delayed action   Measuring relay symbol Measuring relay
The asterik is replaced by letters or symbols related to the relay

Electromagnets Symbols / Electromagnetic Controls

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Electromagnet symbol Electromagnet
Electromagnetic drive
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  electromagnet symbol, solenoid operatec Electromagnet
Electromagnet, symbol USA Electromagnet
Electromagnetic drive
US Symbol
  Contact with electromagnetic anchoring mechanism symbol Contact with electromagnetic anchoring mechanism

Symbols of Relay Contacts

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Open contacts symbol Open contacts
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  Closed contacts symbol Closed contacts
Open contacts symbol Open contacts   Closed contacts symbol Closed contacts
Open contacts symbol Open contacts   Closed contacts symbol Closed contacts
Contacts work symbol Contacts work   Contacts resting symbol Contacts resting
Switching contacts symbol Switching contacts   Switch contacts successive symbol Switch contacts successive
Commutator / Switch of relay symbol Commutator / Switch   Commutator / Switch of relay symbol Commutator / Switch
Picture gallery of relays and electromagnets
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