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What Is Single Pole Double Throw Switch

A Single Pole Double Throw Switch is an electromechanical device that can direct current to one of two paths. It has three terminals: one common terminal (C), and two output terminals usually referred to as normally open (NO) and normally closed (NC). When the switch is in the “open” position, the current flows from the common terminal to the NO terminal, and when it’s in the “closed” position, the current flows from the common terminal to the NC terminal. The switch allows for a circuit to be redirected from one output to another, making it useful for applications where alternating between two circuits is necessary, such as switching between different sets of lights or devices within an electrical system.

The Single Pole Double Throw Switch has only two terminals. The middle terminal is the input terminal(common terminal), and the terminal on the left or right is the output terminal.

Single-Pole, Double-Throw - SPDT

The conventional wiring method is as follows: connect the live wire or the positive terminal to the middle input terminal, and connect the output terminal to one terminal of the device. Finally, connect the other terminal of the device with the other end of the input terminal to the power supply.

SPDT(

Single Pole Double Throw (SPDT) Switch Electrical Circuit

Here is an example of a circuit diagram for a single-pole single-throw switch controlling a light bulb.

SPDT

At the same time, you can replace the above light bulb with your corresponding device.

Related Resources

Single Pole Single Throw (SPST) Switch

Double Pole Single Throw (DPST) Switch

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