Switch is an electrical device that is used to break or connect an electrical circuit manually or automatically. The product may be 1way switch or 2way switch. It is mostly available in White, Black, Gray etc. The current rating ranges from 10A,12A, 20A, 25A etc. It is generally used in all residential buildings, commercial buildings, industries etc.

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Detailed Description for Switch

About Product :-

A switch is an electrical component that can break an electrical circuit, interrupting the current or diverting it from one conductor to another. A relay is a switch that is operated by electricity. Switches are made to handle a wide range of voltages and currents; very large switches may be used to isolate high-voltage circuits in electrical substations.

A switch may be directly manipulated by a human as a control signal to a system, such as a computer keyboard button, or to control power flow in a circuit, such as a light switch. Automatically operated switches can be used to control the motions of machines, for example, to indicate that a garage door has reached its full open position or that a machine tool is in a position to accept another workpiece.

A switch responds to an external force to mechanically change an electric signal. Switches are used to turn electric circuits ON and OFF and to switch electric circuits.




An ideal switch would have no voltage drop when closed, and would have no limits on voltage or current rating. It would have zero rise time and fall time during state changes, and would change state without "bouncing" between on and off positions.

Switches have resistance, limits on the current and voltage they can handle, finite switching time, etc.

The ideal switch is often used in circuit analysis as it greatly simplifies the system of equations to be solved, but this can lead to a less accurate solution. Theoretical treatment of the effects of non-ideal properties is required in the design of large networks of switches, as for example used in telephone exchanges.





Type of Switches with applications 

 The types of switches are classified into four types namely:

1. SPST (Single Pole Single Through)

he SPST is a basic ON/OFF switch, that is used to connect or break the connection between two terminals. The power supply for the owl circuit is given by this switch. A simple PST switch is shown below.

Application :-This type of switch has one input and one output. This light switch circuit controls one wire and makes one connection. This is an ON/OFF switch, when the switch in the below circuit is ON or closed, then the current flows through the two terminals and the bulb in the circuit will blink. When the switch is OFF or open, then the current doesn’t flow through the two terminals.


2. SPDT (Single Pole Double Throw)

The SPDT switch is a three terminal switch, one terminal is used as input and remaining two terminals are used as outputs. It joins a mutual terminal to one or the other of two terminals.In the SPDT switch, instead of other terminals, just use COM terminal. For example, we can use COM & A or COM & B.

Applications:- SPDT switch is mainly involved in a three-way circuit to turn ON/OFF a light from two locations like from the top & bottom of a stairway.

Working :-In the circuit below, when the switch A is closed, then the current flows through the terminals, but only light A will glow and light B will OFF. When the switch B is closed, then the current flows through the terminals and only light B will glow and light ‘A’ will OFF. Her two circuits will be controlled through one source or one way.

3. DPST (Double Pole, Single Throw)

The DPST switch consists of two poles that means it includes two identical switches located on side by side. This switch is operated by one single toggle, which means that two discrete circuits are controlled at a time through one push.

Application :-This switch is used to turn two circuits ON/OFF and it consists of four terminals namely two inputs and two o/ps. The main purpose of this switch is to regulate a 240V appliance, where both supply voltages must be ON whereas the unbiased wire may be always connected. When this switch is ON then the current starts flowing through two circuits and when it is turned OFF then it is turned OFF.

4. DPDT (Double Pole Double Throw)

This switch is equal to two SPDT switches, it means two separate circuits, connecting two inputs of each circuit to one of two outputs. The switch position controls the number of ways and from the two contacts each contact can be routed.

Application:-A DPDT switch can be used in any application that needs an open & closed wiring system.

Circuit :-

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