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CM-MSE

The ABB CM‑MSE is a thermistor‑based motor protection monitoring relay used to monitor the temperature of electric motors equipped with PTC (Positive Temperature Coefficient) temperature sensors. It evaluates the temperature rise directly from the motor windings through the sensors and provides a switching output that can be used to protect the motor from overheating conditions. The relay is designed for DIN‑rail mounting and features screw‑terminal connections, making it suitable for integration into control panels and industrial automation assemblies.

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Technical Parameters Product Name: ABB CM‑MSE Thermistor Motor Protection Relay Product Type: Temperature monitoring / motor protection relay Sensor Type: PTC thermistor temperature input Output Contact: 1 normally open (1 N/O) contact Rated Switching Capacity: Up to 250 V AC at 4 A (typical) Control Supply Voltage Options: Common versions include 110–130 V AC, 220–240 V AC, and 24 V AC (model‑dependent) Output Contact Configuration: Single SPST (single pole, single throw) normally open Function: Monitors motor temperature via PTC sensors and triggers output on trip condition Automatic Reset: Yes (relay can reset automatically once normal conditions return) Mounting: DIN‑rail (35 mm) mounting for control cabinets Terminal Type: Screw terminals for power and sensor connections Dimensions (approximate): Width ~22.5 mm, Height ~78 mm, Depth ~78.5 mm Housing Protection: Standard industrial enclosure (IP20 at terminals) Operating Temperature Range: Approximately –20 °C to +60 °C Connection Wire Size: Supports typical industrial wire sizes (stranded with ferrules or solid) Weight: Around 100–120 g Standards & Compliance: Designed to meet relevant IEC/EN standards for monitoring relays and immunity/EMC requirements Typical Applications: • Overtemperature protection for motors with PTC sensors • Motor control panels and automation systems • Industrial machinery where thermal monitoring and motor protection are needed