An overload relay is an electromechanical device that monitors the current flowing to an electric motor. When the current exceeds its designated limit for a certain period, the relay activates and interrupts the electrical circuit, thereby preventing damage to the motor. Overload relays are specifically engineered to handle motor start-up surges, ensuring that brief spikes in current do not trigger a shutdown. This balance of sensitivity and robustness is crucial for maintaining operational reliability.

    How Does an Overload Relay Work?

    Overload relays operate using different principles, with the most common types being the thermal overload relay and the electronic overload relay.