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Basic ConceptsControlElectrical / Electronics Symbols

Switch and Push Button Symbols

Switches Symbols & Push Buttons Symbols

Switch & Push Button Symbols

Generic Switch SymbolSwitch symbol

It is the symbol of a generic switch in open condition.

Open SwitchOpen Switch Symbol

This is a generic symbol for an open switch. A switch is a component that can break or make the circuit. An open switch represents a break circuit & it stops the flow of current through it.

Closed switchClose switch Symbol

It is a generic symbol for closed switch. a closed switch means the circuit is complete & current can flow through it.

Thermal Magnetic SwitchThermal magnetic switch Symbol

It is the symbol of thermal magnetic switch. it incorporates both electromagnetic  and thermal breaking. During huge current spikes, electromagnet instantaneously breaks the circuit without any delay. But its bimetallic strip provides a little delay when the current exceeds its limit.

Limit SwitchLimit Switch Symbols

The given symbol represent a limit switch. it is operated by mechanical parts of any machine which is used in control systems. It is activated by any other objects or machines parts when it comes in contact with its actuator.

Telegraph KeyTelegraph key Symbol

Telegraph key is represented by this symbol. It is a special electrical switch designed for transmitting text messages in Morse code. It connects & disconnects the circuit creating pulses of different length called “dots” & “dashes”.

Differential SwitchDifferential switch Symbol

Differential switches operate on the difference between the phase line current & the neutral line current. If there is any current difference (due to fault current), then it breaks the circuit.

Pulse Counter SwitchPulse counter switch Symbol

This switch’s actuator is operated by a pulse counter. Whenever the pulse counter reaches a fixed value the switch activates and switches the circuit connected with it.

Switch SPDTsingle pole double throw - SPDT Switch Symbol

It is the symbol for single pole double throw (SPDT) switch. Such kind of switch has three terminals with one common terminal. The common terminal is connected with either one of the other two terminals.

Slide Switch SPDTSlide Switch SPDT Symbol

Slide switch has a slider that slides back and forth in position for making & breaking the current flow in the circuit. The symbol given is an SPDT slide switch also known as single pole double throw switch.

Switch DPSTSwitch DPST Symbol - Double Pole Double Throw

DPDT stands for double pole single throw. It has two poles, means two different circuits can be connected to it and one throw means that it has only one ON (close loop) position. It either switches ON or OFF the two circuits at the same time.

Switch DPST One close before otherSwitch DPST One close before other symbol

It is also a DPST Switch but such type of switch has one modified pole which closes (make contact) before the other one during closing position. They are used in specific applications where a connection needs to be made before the other one.

Switch DPDTDPDT - double pole double throw switch symbol

DPDT stands for double pole double through. It is two SPDT Switches combined with common lever. DPDT switch can switch two different circuits at the same time. In either of the two positions, each circuits has close connection with separate terminals.

Switch DPMTDPMT- double pole multi throw switch symbol

DPMT stands for double pole multi throw. This switch has two poles i.e. it can switch two independent circuits. Each circuit can be switched to multiple terminals.

Switch SP4TSP4T - single pole and 4 throws swicth symbol

It is the symbol for switch having single pole and 4 throws. It has 4 position & it can switch a single circuit by connecting it with any of the 4 terminals.

Rotary SwitchRotary switch Symbol

It is the symbol used for rotating or rotary switch. it has knob which rotates around its axis & it switches the common terminal to any of the output terminals. Rotary switches can have multiple levels (poles) for switch multiple separate circuits & multiple throws.

On-Delay SwitchOn-Delay Switch Symbol

On-delay switch instantaneously switch form ON(close) to OFF(Open) position. But during siwtching from OFF position to ON postion it takes some time delay. The symbolic representation for On-Delay Switch is given above.

ON OFF Delay SwitchON OFF Delay Switch Symbol

This type of switch has time delay function whenever it switches. Switching from ON to OFF or from OFF to ON, in both situations the switch takes some time delay.

Generic Push Button SwitchGeneric push button Switch Symbol

It is the symbol of a Single pole single throw generic pushbutton switch. It has an actuator which switches the circuit ON & OFF by pushing.

Rotary Closed SwitchRotary closed switch symbol

It is the symbol of a rotary switch in closed (ON) Postion. It is a single pole switch in Make contact position. It has no automatic return position.

Rotary Open switchRotary Open switch Symbol

It is the symbol of a rotary switch in open (OFF) Position.

NO Push ButtonNO Push Button Symbol - Normally Open

It is a NO (Normally Open) Push button. Normally, it remains in open(OFF) position. Pressing the pushbutton switches it into ON (Close) position but releasing the button return the switch into OFF (open) position.

NC Push ButtonNC Push Button Symbol - Normally Closed

This is a normally close push button which remains Closed (ON position) normally. It switches into OFF position by pressing the button but after releasing, it returns to Closed position.

Push Button LockablePush button Lockable Switch symbol

This is the symbol of a push button with lockable feature. It automatically return to its normal position but it can be locked in the desired position.

Positive opening Push Button mushroom headPositive opening push button mushroom head Switch Symbol

It is a push button with mushroom head. It is positive opening switch means its contacts are open when the device is in its corresponding open position.

Positive make Contact Push ButtonPositive make Contact push Button symbol

It is also a push button with positive make contact (Close position). Its contact closes when the position of the switch corresponds to the close position of the switch.

Timer SwitchTimer Switch Symbol

It is the symbol for a timer switch. it basically makes and breaks contact when the timer runs out. The timer sets the timer using mechanical clockwork. It provide a time delay for specific applications.

Delayed Closing SwitchDelayed Closing Switch Symbol

It is the symbol of a switch whose contact does not close immediately but it takes a little time delay.

Fast Closing SwitchFast Closing Switch Symbol

This symbol represents a fast closing switch. This switch instantly closes (turn ON) after switching its position.

Delayed Opening SwitchDelayed Opening Switch Symbol

It is a delayed opening switch. During switching its position form ON to OFF, its contacts are still close for some time.

Fast Opening SwitchFast Opening Switch Symbol

This switch instantly opens its contacts during switching thus making a fast open situation.

Push to Make SwitchPush to make switch Symbol

This symbol represents a push button switch in open position or also known as push to make switch. Manually pressing & holding the push button will closes its contact into ON position. After releasing the push button, the  switch return to Open condition.

Push to Break SwitchPush to break switch symbol

This switch is normally in close condition i.e. the circuit is complete. When you press the button and hold it, it breaks the circuit. Upon releasing the button, it returns to its normal close condition.

Push Button Limit SwitchPush button limit switch Symbol

It is a push button limit switch. Limit switch are actuated by the motion of mechanical parts of machines or other objects etc. it switches circuits that control other parts of a machine.

Push Button Double Pole Limit SwitchPush button Double pole limit switch Symbol

It is also a limit switch but it has two pole i.e. it control two separate circuit. this type of switch breaks one circuit and closes the other one.

Joystick SwitchJoystick Switch Symbol

Joystick is a switch with a lever or stick connected to the base. The directional movement of the stick connects the different terminals of the switch. it is used in gaming controller pads, in cranes & trucks in the industry.

Push Button SPDTPush Button SPDT Symbol

This is a single pole double throw push button. There is no open position is this switch. It makes contact (ON state) in both positions. Pushing & holding the button will switches the circuit unto the other terminal. Releasing the button will return the contact to its original position.

Push Button DPDTPush Button DPDT Symbol

This is a double pole double throw switch. it switches two separate circuit but pressing the button will break one circuit and closes the other one. Also upon releasing the button, the switching will be reversed.

Float SwitchFloat Switch Symbol

Float switch is a switch that controls a circuit or machine inside a tank full of liquid. It detects the level of the liquid and switches ON or OFF when the liquid level rises or fall.

Thermal SwitchThermal switch Symbol

Thermal switch is temperature dependent switch that switches a circuit when it crosses a preset temperature. However, it returns to its normal position when the temperature becomes normal.

NC Thermal Switch

It is a normally closed thermal switch that is in ON (close) position during room temperature. When the temperature increases above a fixed point, it breaks the circuit. when the temperature reduces below the point it switches ON the circuit.

NO Thermal Switch

It is also a thermal switch it is normally open in room temperature.  Increasing the temperature makes the contact switching it into ON position & reducing it switches it into OFF position.

Selector SwitchSelector Switch Symbol

Selector switch is a rotary switch with two or more than 2 positions. It can switch one or more than one circuits at the same time.

StarterStarter Switch Symbol

Also known as electronic fluorescent starter is used to soft start the fluorescent lamp by preheating the cathode and send a controlled pulse to the lamp to start glowing.

Mercury SwitchMercury switch Symbol

Mercury switch has mercury inside a vessel in between the two terminals of the switch. The movement of the mercury closes & opens the circuit when the vessel is tilted. The mercury is a conductor & it connects the terminals when it touches it. Mercury switch can be used where there is motion like tilting, rolling etc.

Foot Operated SwitchFoot operated switch Symbol

This symbol represents a foot operated or foot pedal switch. it is a single pole switch which control a circuit or motor usually used in controlling heavy machinery. It has a very rugged design because it is being operated by foot.

Switch DPST BBMSwitch DPST BBM Symbol - Break Before Make

It is a double pole single throw switch with break before make (BBM) mechanism. It switches two circuits but first it breaks (open) one circuit and then makes (close) the other one.

Proximity SwitchProximity switch Symbol

Proximity switch is a sensor that detects an object with in close range. It is non-contact sensor switch. Whenever an object comes in its range, it switches & corresponding circuit is activated. This circuit can be an alarm or counter or any type of logic circuit.

Neon Lamp SwitchNeon Lamp switch Symbol

This is a simple single pole single throw switch with a neon lamp. The neon lamp acts an indicator for showing the flow of current through the switch.

DIP Switchdual inline package Switch Symbol - DIP Swicth

DIP stands for dual inline package. it is made from packing multiple switches together in a dual inline package (DIP). Due to Its compact size, it is used in PCB (printed circuit boards).

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