The Full Form of SPST is Single-pole, single-throw.
A Single Pole Single Throw (SPST) switch is a switch that only has a single input and can connect only to one output. This means it only has one input terminal and only one output terminal.
A Single Pole Single Throw switch serves in circuits as on-off switches. When the switch is closed, the circuit is on. When the switch is open, the circuit is off.
SPST switches are, thus, very simple in nature.
Below is an example of a circuit which utilizes a single pole single throw switch.
SPST
means
Single-pole, single-throw
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