1SVR740700R2100

The ABB 1SVR740700R2100 (CM-MSS.13P) is a high-quality thermistor motor protection relay designed to monitor motor winding temperatures and protect industrial electric motors against overheating. Manufactured by ABB, this relay belongs to the CM-MSS series of motor protection monitoring relays. It operates with rated control supply voltages of 110–130V AC or 220–240V AC and features one changeover (SPDT) output contact rated at 250V and 4A. The relay includes a dedicated sensor circuit for monitoring compatible PTC temperature sensors installed inside motor windings, making it suitable for industrial motor control panels, electrical machinery, and automation applications.

The ABB CM-MSS.13P 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 overheating condition. Its output contact changes state, allowing a properly designed motor control circuit to disconnect or inhibit motor operation.