Electrical & Electronic Symbols

Switch Symbols

The Switches are electrical or electronic elements that are used, mainly by pressure, to allow, interrupt or temporarily or permanently divert the passage of electrical current between a power source and a device.

Symbols of Switches and Circuit Switches
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      
Picture gallery of electrical and related switches
Push-button switches
Single line switches symbols
Symbols of power switching devices
Symbols of switches by effects & dependencies
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