Thermal Overload Relay

A thermal overload relay is an electromechanical motor protection device designed to prevent damage caused by sustained overcurrent and overheating. It operates on the thermal principle using a bimetal element that bends when excess current flows, causing the relay to trip and disconnect the motor circuit. Typical technical characteristics include adjustable current setting ranges, tripping classes such as Class 10 or Class 20, auxiliary contacts for control indication, manual or automatic reset options, and compatibility with motor starters, making it suitable for industrial control panels and motor protection systems.