![]() In figure 3, we can see a schematic diagram of a light bulb connected directly to the AC mains. ![]() So basically, an SPST toggle switch is simply an ON-OFF switch with two terminals (A & B) that can be connected together or disconnected from each other by toggling the lever (actuator). An SPST switch has one pole and one throw, so it can only control one circuit and its pole can be connected to one terminal only. The number of poles in a switch determines how many separate circuits the switch can control while the throw-count of a switch tells us how many positions each of the switch’s poles can be connected to. In figure 2, you can see a single-pole, single-throw (SPST) toggle switch and the circuit symbol of an SPST switch. A switch is an electrical or electronic device that can open or close a circuit, stopping or allowing the flow of current in a circuit. ![]()
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