Centrifugal Switch
A centrifugal switch is an electrical switch that uses the rotational force of a spinning shaft to open or close a circuit based on the shaft's speed. Its most common application is in single-phase AC induction motors to disconnect the starter winding once the motor reaches a certain speed
Core Features
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The switch is activated by the centrifugal force generated by the rotating motor shaft.
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It includes a governor assembly with spring-loaded weights and a moving contact arm that responds to changes in motor speed.
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As the motor accelerates and reaches a certain RPM, centrifugal force overcomes the spring tension, causing the governor weights to move outwards.
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This outward movement actuates the switch contacts, opening the circuit for the starting winding or capacitor.
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The switch provides a crisp, snap-action to avoid issues like contact chatter and ensure reliable switching.
Key Functions
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Its primary function is to disengage the start winding, starting capacitor, or auxiliary winding once the motor has achieved sufficient speed to operate on its own.
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By cutting off the starting components, the switch prevents them from overheating or burning out, leading to improved motor efficiency and lifespan.
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Centrifugal switches are designed for a wide range of motor speeds, from low-speed applications to high-speed motors reaching 10,000 RPM.
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Some centrifugal switches are specifically designed for two-speed motors, allowing for different cut-in and cut-out speeds depending on the operating requirements.
