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What are relay symbols and what do the different relay symbols mean?

August 01 , 2023 0
There are quite a few symbols that can exist on a relay, what do the different symbols mean? The new symbols for relays are represented by the letter K, which used to be represented by J. Double letters should be used for subdivision. Voltage Relay: KV, Current Relay: KA, Time Relay: KT, Frequency Relay: KF, Pressure Relay: KP, Control Relay: KC, Signal Relay: KS, Earth Relay: KE

There are three basic forms of relay contacts:

1, dynamic close type (normally open) (H type) coil is not energised when the two contacts are disconnected, when energised, the two contacts are closed. The phonetic prefix "H" of the word "H" is used to denote the two contacts.
2、Disconnecting type (normally closed) (D type) When the coil is not energised, the two contacts are closed, and when energised, the two contacts are disconnected. The word "D" is used as the phonetic prefix of the word "break".
3、Conversion type (Z type) This is the contact group type. This contact group has three contacts, i.e., the middle is a dynamic contact, and the top and bottom each have a static contact. Coil is not energised, the dynamic contact and one of the static contact is
disconnected and the other is closed, the coil is energised, the dynamic contact is moved, so that the original disconnected into closed, the original closed into the disconnected state, to achieve the purpose of the conversion. Such a contact group is called a switching
contact. Use "z" to indicate the pinyin head of the word "turn".

Symbols of Relays / Electromagnet Controls
Symbol Description Symbol Description
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
+ Info
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
+ Info		 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
+ Info
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
Relay with light pilot symbol Relay with light pilot

Measuring Relay 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

Electromagnet Symbols / Electromagnetic Controls
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Electromagnet symbol Electromagnet
Electromagnetic drive
+ Info		 electromagnet symbol, solenoid operatec Electromagnet
Electromagnet, symbol USA Electromagnet
Electromagnetic drive
US Symbol		 Contact with electromagnetic anchoring mechanism symbol Contact with electromagnetic anchoring mechanism
Reed switch / Reed relay symbol Reed relay / Reed switch
+ Info

Symbols of Relay Contacts
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Open contacts symbol Open contacts
NO - Normally open
+ Info		 Closed contacts symbol Closed contacts
NC - Normally closed
Open contacts symbol Open contacts
NO - Normally open		 Closed contacts symbol Closed contacts
NC - Normally closed
Open contacts symbol Open contacts
NO - Normally open		 Closed contacts symbol Closed contacts
NC - Normally closed
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

Relay device symbols with contacts
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Relay symbol / solenoid operated Relay / solenoid operated
(Coil and Switch)
Generic symbol
+ Info		 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 switch symbol Relay switch Contactor symbol Contactor
Relay - SPST symbol Relay - SPST
Single pole, single throw		 Relay - SPDT symbol Relay - SPDT
Single pole, double thorw
Relay - DPST symbol Relay - DPST
Double pole, single thorw		 Relay - DPDT symbol Relay - DPDT
Double pole, double thorw
Relay - DPST symbol Relay - DPST
Double pole, single thorw		 Relay - 3PDT symbo Relay - 3PDT
Three pole, double thorw
Relay - 3PST symbol Relay - 3PST
Three pole, single thorw
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