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Electrical Switch Symbols

Electrical Switch Symbols

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Electrical Switch Symbols

Symbol Description Symbol Description
Open switch symbol Open switch SPST
Single pole, single throw
NO – normally open
Generic symbol
+ Info		 Closed switch symbol Closed switch SPST
Single pole, single throw
NC – normally closed
Switch with delayed opening symbol Switch with delayed opening Switch with delayed opening and closing symbol Switch with delayed opening and closing
Switch with delayed opening symbol Switch with delayed opening Switch delay when opening and closing symbol Switch delay when opening and closing
Limit switch symbol Limit switch
+ Info		 Double limit switch symbol Double limit switch
When one closes another opens
Time switch symbol Time switch / Timer
+ Info		 Electronic clock switch symbol Electronic clock switch
Torque switch symbol Torque switch, open on high torque Thermal switch symbol Thermal switch
+ Info
Open thermal switch symbol Open thermal switch – NO Closed termal switch symbol Closed termal switch – NC
Level switch fluid / Float switch symbol Float switch
Level switch fluid
+ Info		 Differential switch symbol Differential switch
Pressure switch symbol Pressure switch, closed on rising pressure Flow switch symbol Flow switch, close on increase in flow
water, air, etc
pressure or vacuum switch symbol Pressure or vacuum switch Differential pressure switch symbol Differential pressure switch
Limit switch open symbol Limit switch
NO – Normally open		 Limit switch closed symbol Limit switch
NC – Normally closed
De-energized switch symbol De-energized switch Energized switch symbol Energized switch
Vibration switch symbol Vibration switch, closed on rising vibration Foot operated switch symbol Foot operated switch
Thermal magnetic switch symbol Thermal magnetic switch
Magnetothermic switch
+ Info		 Key selector switch symbol Key selector switch
Roller switch symbol Roller switch Handwheel switch symbol Handwheel switch
Electric motor switch symbol Electric motor switch Electromagnetic switch symbol Electromagnetic switch
Cam switch symbol Cam switch Lever switch symbol Lever switch
Dual In-line Package, DIP symbol DIP (Dual In-line Package)
Encapsulated switches
+ Info		 Electronic limiter symbol Electronic limiter
Dual In-line Package, DIP symbol DIP (Dual In-line Package)
encapsulated switches
e.g. 4 switches		 Switch with neon lamp incorporated symbol Switch with neon lamp incorporated
Mercury switch symbol Mercury switch
Inclination or motion detector
+ Info		 NC Mercury switch symbol NC, Mercury switch
NO Mercury switch symbol NO, Mercury switch Starter symbol Starter
+ Info
Selector symbol Selector Pulse contact symbol Contact driven by a pulse counter
+ symbols
Foot operated switch symbol Foot operated switch Time switch symbol Time switch
Circuit switch Symbols (SPDT / DPST / DPDT and Multi-Switch)
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Switch, SDPT symbol Switch SPDT
Single pole, double throw
Generic symbol		 Switch, SDPT symbol Switch SPDT
Single pole, double throw
Double switch symbol Double switch DPST – bipolar
Double pole, single throw		 Double switch symbol Double Switch DPST – bipolar
Double pole, single throw
One closes before the other
Slide switch, SDPT symbol Slide switch, SPDT
Single pole, double throw		 Double Switch, DPDT symbol Double Switch DPDT
Double pole, double throw
Double Switch, DPDT symbol Double Switch, DPDT
Double pole, double throw		 Multi-switch symbol Multi-switch
Multi-switch symbol Multi-switch Multi-switch symbol Multi-switch
Rotating Multi-switch / Rotary switch symbol Rotary switch
Rotating Multi-switch
+ Info		 Multi-switch symbol Multi-switch
Rotating Multi-switch symbol Rotating Multi-switch Multi-switch symbol Multi-switch
Symbols of Switches of Two and Three Positions
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Switch symbol switch
Closing or work contact
Generic symbol		 Switch symbol Switch
Closing or work contact
Switch opening or resting symbol Switch opening or resting Inverter switch before closing symbol Inverter switch before closing
Inverter switch with intermediate cutting position symbol Inverter switch with intermediate cutting position Inverter switch before opening symbol Inverter switch before opening
Double opening switch symbol Double closing contact Inverter switch before opening contact Inverter switch before opening
Contact double opening symbol Contact double opening Circuit switch symbol Circuit switch
Cutting contact before making contact
Disconnectors / Unipolar Switch Symbols
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Disconnectors, manual contact symbol Disconnectors, manual contact
Generic symbol		 Disconnectors / open pushbutton symbol Disconnectors / open pushbutton
With automatic return after closure
Open rotating contact symbol Open rotating contact
Without automatic return after closure		 Contact / close pushbutton symbol Contact / close pushbutton
With automatic return after opening
Close rotating contact symbol Close rotating contact
Without automatic return after opening		 Contact / Squeegee switch symbol Contact / Squeegee switch
With automatic locking and return
Pushbutton with mushroom head symbol Pushbutton with mushroom head
With positive operation of opening contact and fixed position		 Contact / open pushbutton symbol Contact / Open pushbutton
Positive contact operation
Symbols of Position Switches
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Position contact symbol, closure Position contact
Closing contact		 Position contact symbol, opening Position contact
Opening contact
Dual position switch mechanically symbol Dual position switch mechanically operated in both directions Symbols of the position switch with positive opening operation of NC contact position switch with positive opening operation of NC contact
Symbols of Contacts with Automatic Return and Position Maintained
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Momentary contact symbol Momentary contact Maintained contact symbol Maintained contact
shutdown switch with automatic return symbol Shutdown switch with automatic return Opening switch with automatic return symbol Opening switch with automatic return
Closing switches with maintained position symbol Closing switches with maintained position reversing switch symbol Inverter Switch with intermediate position, with automatic return in position and without automatic return in the opposite
Symbols of Operation Switches with Advanced or Delayed
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Delayed closing switch symbol Delayed closing switch Early opening switch symbol Early opening switch
Early shutdown switch symbol Early shutdown switch Delayed opening switch symbol Delayed opening switch
Symbols of Switches of Step in Two-Position
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Step with momentary switch symbol Step switch with momentary closing when its control device is activated Step with momentary switch Step switch with momentary closing when its control device is disabled
Symbol of the step switch with momentary closure when toggles its control device Step switch with momentary closing when its control device is toggle on or off

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