The rotary switch consists of a spindle or "rotor" with a contact arm or "spoke" that protrudes from its surface like a CAM. It has a set of terminals arranged in a circle around the rotor, and each terminal serves as a contact for the "spoke" through which any one of many different circuits can be connected to the rotor. Switch layer, allowing the use of multiple poles; Each layer corresponds to a pole. Alternatively, rotation can be limited to a small part of the circle (half; First third), then each layer can have more than one (two; Three equal poles. Typically, this switch has a pawl mechanism, so it "clicks" from one active position to another, rather than stopping in the middle. As a result, the rotary switch provides a greater pole and throwing capability than a simple switch.
