1SVR730700R0200

The ABB 1SVR730700R0200 (CM-MSS.22S) is a high-quality thermistor motor protection relay designed to monitor motor winding temperature and help protect industrial electric motors against excessive heating. Manufactured by ABB, this relay belongs to the CM-MSS series of motor protection monitoring relays 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 includes one dedicated sensor circuit for monitoring compatible PTC temperature sensors installed inside motor windings, making it suitable for industrial machinery, electrical control panels, and automation applications.

The ABB CM-MSS.22S thermistor motor protection relay continuously monitors the resistance of connected PTC thermistors. When the motor winding temperature reaches the sensor's specified response temperature, the resistance increases and the relay detects the overheating condition. Its output contacts change state, allowing a correctly designed motor control circuit to disconnect or inhibit motor operation.