1SVR740700R0200

The ABB 1SVR740700R0200 (CM-MSS.22P) 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 series and operates with a rated control supply voltage of 24V AC/DC. It features two changeover (SPDT) output contacts rated at 250V and 4A, providing flexible switching functionality for industrial motor protection circuits. The relay has one dedicated sensor circuit for monitoring compatible PTC thermistors installed inside motor windings, making it suitable for electrical control panels, industrial machinery, and automation systems.

The ABB CM-MSS.22P 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, allowing the relay to detect an overheating condition. Its output contacts change state so that a correctly designed motor control circuit can disconnect or inhibit motor operation.