How does a centrifugal switch operate?

A centrifugal switch operates based on the principle of centrifugal force generated by a spinning component, typically a rotor. When the motor starts and the rotor begins to spin, the centrifugal force increases as the speed of the rotor increases. This force acts on a mechanism within the switch, causing it to open the contacts once a certain speed is reached.

The primary function of the centrifugal switch is to disengage or engage other components of the motor circuit, often used to disconnect starting windings once the motor reaches its operating speed. This helps in protecting the motor and ensuring efficient operation by removing unnecessary starting current once the motor is up and running. The design of the centrifugal switch is specifically tailored to leverage the physical forces produced by rotation, making it an effective and straightforward solution in motor control applications.