What is SPST Switch? Single Pole Single Throw Switch

An SPST switch or Single Pole Single Throw switch is a switch that has only one input and only one output. It just connects and disconnects those single inputs and single outputs to each other. The SPST switch can control only one electrical circuit by making or breaking contacts with one position. It is very simple in nature. It just turns on or off the circuit. It does not have any current bypassing interchanging function. In the ON position, the switch allows the electrical current to flow through the circuit, creating a closed path between the input and output terminals. In the OFF position, the circuit is open, and no current can flow.

Here, you can see the symbol of SPST switch

Here, you can see the circuit diagram of SPST switch to understand its working principle. 

Here in the above wiring diagram of SPST Switch, you can see the switch is connected in series with the battery and a light. As it allows only one input and one output, so the one terminal of the battery(positive terminal) and one terminal of the led light(positive is connected to the SPST switch). The negative terminal of both the battery and light are connected directly.

The working principle and function of the SPST switch is very simple. When it closed its contacts the circuit will be closed and turned on. So the LED will be glow. When it opens its contacts the circuit will be open and turned off. So the led also be turned off.

SPST switches can be operated manually, where a person physically flips the switch between ON and OFF positions, or they can be incorporated into automatic systems where the switching action is controlled by a sensor, timer, or other devices.

You can see the application and uses of the SPST switch in your house switchboard. Yes, the switches used in your house's electrical switchboard is used for turning on or off the lights, fans are the examples of SPST switch. Remember one-way switches are SPST, but two-way switches are SPDT means single pole double through.

SPST switches are available in the market in many types of switches such as toggle switches, piano-type switches, etc. So, it does not imply that a toggle switch or piano-type switch is working in other principles. They also work in SPST or SPDT principles.

SPST Switch Use

1. It can be used to light On/Off purposes.

2. It can be used to On/Off the power supply.

Read Also: 

• What is SPDT Switch? Single Pole Double Throw
• What is DPST Switch? Double Pole Single Throw
• What is DPDT Switch? Double Pole Double Throw
• [Proper] Two Way Switch Connection Diagram and Wiring
• 4 Way Switch Wiring Diagram and Connection

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