how overload relay works

how overload relay works
Overload relay protects a motor by sensing the current going to the motor. Many of these use small heaters, often bi-metallic elements that bend when warmed by the current to the motor.
When the current is too high for too long, heaters open the relay contacts carrying current to the coil of The main function of the overload relay prevents the motor to get damaged by monitoring the current in the motor circuit and breaking the circuit when an electrical overload or a phase failure is detected.
Since the relay is much cheaper than motors, they provide an affordable way of protecting motors.
What causes an overload relay to trip
Causes may include a large change in load sudden loading of the motor, misalignment, a broken drive gear, or improper motor drive settings. Power problems like low voltage or low power factor also may cause an overload condition.

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