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When a general duty split-phase motor reaches approximately 75% of its operating speed, the start winding is de-energized by a _______.

User Codo
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Final answer:

The start winding of a split-phase motor is de-energized by a centrifugal switch, which operates when the motor reaches approximately 75% of its operational speed to prevent overheating.

Step-by-step explanation:

When a general duty split-phase motor reaches approximately 75% of its operating speed, the start winding is de-energized by a centrifugal switch. This action occurs in the motor's start-up phase, where the start windings are used to create an initial phase shift to start the motor. Once the motor reaches a sufficient speed, the centrifugal switch opens to disconnect the start windings to prevent them from overheating. It is a crucial component for the safe and efficient operation of split-phase motors.

User Jet
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