Final answer:
When a line duty overload protector detects an overload, it trips to interrupt the current to prevent motor damage. It must be reset after resolving the overload and cooling the motor.
Step-by-step explanation:
When a line duty overload protector, which is a type of electrical protection device for motors, detects an overload, it typically trips or activates to interrupt the current flowing to the motor. This action helps to prevent damage to the motor that could be caused by excessive heat generated from the overload condition. Overload protectors are usually set to trip at currents that exceed the motor's safe operating capacity. After tripping, the device must either be manually or automatically reset once the overload condition has been resolved and the motor has had time to cool down.
When a line duty overload protecting a motor detects an overload, it responds by interrupting or breaking the electrical current flow to the motor. This is done to prevent further damage to the motor due to excessive current. The protection mechanism in the overload relay senses the high current and triggers a trip signal that de-energizes the motor circuit, shutting down the motor.