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What is Single Pole Single Throw Switch?

A Single Pole Single Throw Switch is the simplest form of switch, consisting of two terminals and a single switching mechanism. It connects or disconnects a single conductor, such as a wire, to a single terminal, allowing current to either flow or be interrupted in a circuit. When the switch is in the “closed” position, the circuit is complete, and electricity can pass through; when in the “open” position, the circuit is broken, and electricity is blocked from moving further. SPST switches are commonly used in household applications like turning lights on and off. They are straightforward to operate and provide a reliable means to control power to a device.

The Single Pole Single 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, Single-Throw - SPST

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.


Single Pole Single Throw Switch Electrical Circuit

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


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

Related Resources

Single Pole Double Throw (SPDT) Switch

Double Pole Single Throw (DPST) Switch

Double Pole Double Throw (DPDT) Switch

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