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Electrical Switch Symbols

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Electrical Switch Symbols

SymbolDescriptionSymbolDescription
Open switch symbolOpen switch SPST
Single pole, single throw
NO – normally open
Generic symbol
+ Info		Closed switch symbolClosed switch SPST
Single pole, single throw
NC – normally closed
Switch with delayed opening symbolSwitch with delayed openingSwitch with delayed opening and closing symbolSwitch with delayed opening and closing
Switch with delayed opening symbolSwitch with delayed openingSwitch delay when opening and closing symbolSwitch delay when opening and closing
Limit switch symbolLimit switch
+ Info		Double limit switch symbolDouble limit switch
When one closes another opens
Time switch symbolTime switch / Timer
+ Info		Electronic clock switch symbolElectronic clock switch
Torque switch symbolTorque switch, open on high torqueThermal switch symbolThermal switch
+ Info
Open thermal switch symbolOpen thermal switch – NOClosed termal switch symbolClosed termal switch – NC
Level switch fluid / Float switch symbolFloat switch
Level switch fluid
+ Info		Differential switch symbolDifferential switch
Pressure switch symbolPressure switch, closed on rising pressureFlow switch symbolFlow switch, close on increase in flow
water, air, etc
pressure or vacuum switch symbolPressure or vacuum switchDifferential pressure switch symbolDifferential pressure switch
Limit switch open symbolLimit switch
NO – Normally open		Limit switch closed symbolLimit switch
NC – Normally closed
De-energized switch symbolDe-energized switchEnergized switch symbolEnergized switch
Vibration switch symbolVibration switch, closed on rising vibrationFoot operated switch symbolFoot operated switch
Thermal magnetic switch symbolThermal magnetic switch
Magnetothermic switch
+ Info		Key selector switch symbolKey selector switch
Roller switch symbolRoller switchHandwheel switch symbolHandwheel switch
Electric motor switch symbolElectric motor switchElectromagnetic switch symbolElectromagnetic switch
Cam switch symbolCam switchLever switch symbolLever switch
Dual In-line Package, DIP symbolDIP (Dual In-line Package)
Encapsulated switches
+ Info		Electronic limiter symbolElectronic limiter
Dual In-line Package, DIP symbolDIP (Dual In-line Package)
encapsulated switches
e.g. 4 switches		Switch with neon lamp incorporated symbolSwitch with neon lamp incorporated
Mercury switch symbolMercury switch
Inclination or motion detector
+ Info		NC Mercury switch symbolNC, Mercury switch
NO Mercury switch symbolNO, Mercury switchStarter symbolStarter
+ Info
Selector symbolSelectorPulse contact symbolContact driven by a pulse counter
+ symbols
Foot operated switch symbolFoot operated switchTime switch symbolTime switch
Circuit switch Symbols (SPDT / DPST / DPDT and Multi-Switch)
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Switch, SDPT symbolSwitch SPDT
Single pole, double throw
Generic symbol		Switch, SDPT symbolSwitch SPDT
Single pole, double throw
Double switch symbolDouble switch DPST – bipolar
Double pole, single throw		Double switch symbolDouble Switch DPST – bipolar
Double pole, single throw
One closes before the other
Slide switch, SDPT symbolSlide switch, SPDT
Single pole, double throw		Double Switch, DPDT symbolDouble Switch DPDT
Double pole, double throw
Double Switch, DPDT symbolDouble Switch, DPDT
Double pole, double throw		Multi-switch symbolMulti-switch
Multi-switch symbolMulti-switchMulti-switch symbolMulti-switch
Rotating Multi-switch / Rotary switch symbolRotary switch
Rotating Multi-switch
+ Info		Multi-switch symbolMulti-switch
Rotating Multi-switch symbolRotating Multi-switchMulti-switch symbolMulti-switch
Symbols of Switches of Two and Three Positions
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Switch symbolswitch
Closing or work contact
Generic symbol		Switch symbolSwitch
Closing or work contact
Switch opening or resting symbolSwitch opening or restingInverter switch before closing symbolInverter switch before closing
Inverter switch with intermediate cutting position symbolInverter switch with intermediate cutting positionInverter switch before opening symbolInverter switch before opening
Double opening switch symbolDouble closing contactInverter switch before opening contactInverter switch before opening
Contact double opening symbolContact double openingCircuit switch symbolCircuit switch
Cutting contact before making contact
Disconnectors / Unipolar Switch Symbols
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Disconnectors, manual contact symbolDisconnectors, manual contact
Generic symbol		Disconnectors / open pushbutton symbolDisconnectors / open pushbutton
With automatic return after closure
Open rotating contact symbolOpen rotating contact
Without automatic return after closure		Contact / close pushbutton symbolContact / close pushbutton
With automatic return after opening
Close rotating contact symbolClose rotating contact
Without automatic return after opening		Contact / Squeegee switch symbolContact / Squeegee switch
With automatic locking and return
Pushbutton with mushroom head symbolPushbutton with mushroom head
With positive operation of opening contact and fixed position		Contact / open pushbutton symbolContact / Open pushbutton
Positive contact operation
Symbols of Position Switches
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Position contact symbol, closurePosition contact
Closing contact		Position contact symbol, openingPosition contact
Opening contact
Dual position switch mechanically symbolDual position switch mechanically operated in both directionsSymbols of the position switch with positive opening operation of NC contactposition switch with positive opening operation of NC contact
Symbols of Contacts with Automatic Return and Position Maintained
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Momentary contact symbolMomentary contactMaintained contact symbolMaintained contact
shutdown switch with automatic return symbolShutdown switch with automatic returnOpening switch with automatic return symbolOpening switch with automatic return
Closing switches with maintained position symbolClosing switches with maintained positionreversing switch symbolInverter 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 symbolDelayed closing switchEarly opening switch symbolEarly opening switch
Early shutdown switch symbolEarly shutdown switchDelayed opening switch symbolDelayed opening switch
Symbols of Switches of Step in Two-Position
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Step with momentary switch symbolStep switch with momentary closing when its control device is activatedStep with momentary switchStep switch with momentary closing when its control device is disabled
Symbol of the step switch with momentary closure when toggles its control deviceStep switch with momentary closing when its control device is toggle on or off
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