What type of switch is represented by component 3 in figure T-2?

In schematic figure T-2, component 3 represents a basic electrical on/off switch. It features a single moving contact, known as the "pole," which connects to a single stationary contact, known as the "throw." Because it controls only one circuit path and has only one "on" position, it is formally known as a Single-Pole Single-Throw (SPST) switch. Distractors like "double-throw" refer to switches that can route one input to two possible outputs (like a three-way light switch), while "double-pole" refers to switches that control two completely separate circuits simultaneously with one physical lever.