Different Types of Electrical Switches and Their Uses

Different Types of Electrical Switches Normally Used in Circuits

There are so many types of electrical switches available from very simple to very complex switches used in electrical circuit controlling system. 

Switch may different types but the basic function of electrical switch is to open or close. The meaning of electrical switch is to open or close the electrical path to equipment. 

What are the different types of electric switches that uses in every home?

When we name the switches, we find some common and lovely switches as below:
SPST Single Pole Single Through SwitchSPST- Single pole, single throw switch. It is simple on-off switch just having  two terminals are either connected together or disconnected from each other by phase P1 and terminal T1.
It is also classified into two types: SPST-NO-single pole, single throw, normally open known as Type-A and SPST-NC- single pole, single throw, normally closed known as Type-B. 

The most common and simple type of electric light switch is the one way switch. A very simple one way press operation and instant effects. Their operational simplicity makes user comfort a reality.

SPDT Single Pole Double Through Switch SPDT-  Single pole, double throw. It is simple break-before-make changeover switch common terminal is connected either to Terminal T1 or Terminal T2.
Similar as SPDT some manufacturer use SPCO/SPTT meaning single pole changeover or single pole, center off or single Pole Triple Throw for switches. 

Two way switches are very much different and are extensively found in modern homes that have limited number of switching accessories. Their usage is very efficient and adds to the convenience of the users significantly.

DPST Double Pole Single Through Switch DPST- Double pole, single throw. DPST actually equivalent to two SPST switches together controlled by a single mechanism.

DPDT Double Pole Double Through Switch
DPDT- Double pole, double throw. DPDT actually equivalent to two SPDT switches controlled by a single mechanism. 

Some manufacturer use DPCO - double pole change over for switches with a stable center position. 

2P6T Two Pole Six Trough Switch

2p6tTwo pole, six throw. 2p6t is actually a changeover switch with a common terminal which can connect to L1 to L6 with a two pole second switch controlled by a single mechanism.

What type of switch is used in an electrical panel?

The switches used in electrical panels may manual switches or automatic switches. The manual operated switches such as light switch, fan switch or manual switch for any kind of electrical circuit of electrical equipment.

Automatically operated different switches can be used to control the motions of machines such as to indicate a door has reached its full open position or full close position.

Switches may be operated by process variables such as pressure, temperature, flow, current, voltage, and force, acting as sensors in a process and used to automatically control a system. There are many different switch designs. The most common electrical panel switches are:

Slide switch: A slide switch has a knob that you can slide back and forth to open or close the contacts. Slide switches we find as SPST (single pole single throw), DPDT (double pole double throw) switch.

Toggle switch: A toggle switch has a lever that we flip up or down to open or close the contacts. The common light switch used in household wiring is an example of a toggle switch.Toggle switches are actuated by a lever angled in one of two or more positions. Most famous type of toggle Electrical Switches contain two positions.

Rotary switch: A rotary switch has a knob that we turn to open and close the contacts. The switch in the base of many tabletop lamps is an example of a rotary switch.

Rocker switch: A rocker switch has a seesaw action. We press one side of the switch down to close the contacts, and press the other side down to open the contacts.

You may read the circuit-switch 


Knife switch: A knife switch is the kind of switch Igor throws in a Frankenstein movie to reanimate the creature. In a knife switch, the contacts are exposed for everyone to see.

Mercury switch:The mercury switch consists a drop of mercury inside a glass bulb with 2 contacts. The two contacts pass through the glass, and are connected by the mercury when the bulb is tilted to make the mercury roll on to them.

Push-button switchA push-button is simply button which switch mechanism for controlling some aspect of a machine or a process.  Though even many un-biased buttons require a spring to return to their un-pushed state. These switches are used for bell circuits, refrigerator lighting circuit. Some of push button on industry also contain indication lights such as Red, Green and yellow.

Special types of switches are:

Differential Pressure Switch

Differential Pressure switch: Differential pressure switch is a device which utilizes a differential air pressure to actuate an electric switch at a preset actuation point. This may be the difference between two positive or two negative pressures, one of each, or a positive and atmospheric or a negative and atmospheric pressure. The electric switch may be used to start or stop motors or fans, open or close dampers or louvers, light a warning signal, sound alarms, etc.

Foot Switch

Foot switch: Some machinery like garments factory swing machine use foot switch that operated by foot instead of hand.
Reversing Switch
Reversing switch:Reversing switch is an electric switch that has four terminals capable of being connected in pairs in two different ways so as to reverse the direction of motor.

You may read the different types of switches in details in another articles:

  1. How Select Control Switches, Selector Switches and Auxiliary Switches;
  2. Automatic Transfer Switch Diagram And Operation Procedure;
  3. How Do Electronic Thermostats Work In HVAC System?;

28 Basic Symbol of Electrical Switches that Use Widely

Symbol for electrical switches is important to eletricians to select proper switches during wiring.

Following 28 switch-symbol is the most common uses stitches in our work place.

This is not the limit, there are many switches and switch-symbol for them.

You may read the another article to know the detail wiring syste on-


Symbol of Electrical Switches

Top Brands Electrical Switches that Uses in Bangladesh

Siemens - Huge scale of operation and range, adapted to Bangladesh, electrical switches of Siemens work irrespective of the load, products are reliable. In house Siemens switches and sockets are used as first choise in high grade equipment.

Schneider - French multinational, develops technology and solutions that make energy safe, reliable, efficient, green and productive. Schneider switches and sockets are popular in industry sector.

Legrand -Widely used in Bangladesh as switches and sockets of miniature circuit breakers and distribution boards.

Havells - Indian company, the switches and sockets are widely used in India and Bangladesh.

Wipro - Modular switches are equipped with glossy finish switches flaunt radium markers for visibility at night, protective spark shield for added safety, thermoset housing for safe electrical insulation, and silver coated metal parts for better current conductivity.

Polycab - specializes in high and low voltage switch-gear, different range of solutions that are suitable for all kinds of HV/LV power engineering requirements including protection, metering, and control equipment.

Orpat - Gujarat based company, known for silver series modular switches and copper series modular switches, which are gradually gaining in popularity in the country.

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