What is the primary function of overload relays in motor circuits?

Overload relays play a crucial role in motor circuits primarily by protecting against overloads. When a motor operates beyond its rated capacity, it can draw excessive current, which can lead to overheating and potential damage to the motor windings. The overload relay senses this elevated current condition and interrupts the power supply to the motor, effectively preventing damage from sustained overload situations.

This protective measure is vital for maintaining the longevity and reliability of the motor. By automatically disconnecting the motor under abnormal load conditions, the overload relay ensures that the motor does not operate in a harmful state, which could result in failure and costly repairs. Thus, the function of overload relays is essential for safeguarding equipment and ensuring safe operations in industrial or commercial settings.