1SVR730700R0100

The ABB 1SVR730700R0100 (CM-MSS.12S) is a high-quality thermistor motor protection relay designed to monitor motor winding temperature and protect industrial electric motors against overheating. Manufactured by ABB, this relay belongs to the CM-MSS monitoring relay series and operates with a rated control supply voltage of 24V AC/DC. It features one changeover (SPDT) output contact rated at 250V and 4A, providing reliable switching functionality for suitable motor protection circuits. The relay includes one sensor circuit for monitoring compatible PTC temperature sensors installed in motor windings, making it a practical solution for industrial machinery and automation applications.

The ABB CM-MSS.12S thermistor motor protection relay continuously monitors the resistance of connected PTC temperature sensors. When the motor winding temperature reaches the sensor's specified response temperature, the sensor resistance increases and the relay detects the abnormal condition. Its output contact changes state, allowing a properly designed motor control circuit to disconnect or inhibit motor operation.