1SVR550801R9300

The ABB 1SVR550800R9300 (CM-MSE) is a high-quality thermistor motor protection relay designed to monitor motor winding temperature and protect industrial electric motors against excessive heating. Manufactured by ABB, this relay belongs to the CM thermistor motor protection relay range and operates with a rated control supply voltage of 110–130V AC. It features one normally open (1 NO) output contact rated at 250V AC and 4A, along with a dedicated sensor circuit for monitoring compatible PTC thermistors or bimetal temperature sensors. Its compact design and reliable temperature monitoring functionality make it suitable for industrial motor protection and automation applications.

The ABB CM-MSE thermistor motor protection relay helps prevent motor damage caused by excessive winding temperatures resulting from overload conditions, insufficient cooling, frequent starting, or other operating issues. When the connected temperature sensor reaches its specified response condition, the relay changes its output state, allowing a properly designed motor control circuit to stop or inhibit motor operation.