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CM-MSS.13S

The ABB CM‑MSS.13S is a thermistor motor protection relay designed to monitor the temperature of electric motors fitted with PTC (Positive Temperature Coefficient) thermistor sensors. It continuously measures the motor winding temperature via the PTC sensor circuit and provides a single change‑over (SPDT) contact output for control or alarm signaling. When the temperature exceeds a preset threshold indicating overheating, the relay changes state to protect the motor. The device is suitable for mounting on a DIN rail inside control panels and is used in industrial motor protection systems.

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Technical Parameters Product Name: CM‑MSS.13S Thermistor Motor Protection Relay Device Type: Motor protection monitoring relay (thermistor/PTC based) Supply Voltage (Control Supply): 110–130 V AC 220–240 V AC Rated Frequency: 50/60 Hz Sensor Circuit: 1 sensing circuit for PTC thermistor input Output Contacts: 1 change‑over (SPDT) contact Output Contact Rating: Up to 250 V AC, 4 A (general control load) Connection Terminals: Screw terminal connections Mounting Style: DIN‑rail mountable for control cabinets Automatic Reset: Yes — relay resets automatically once the fault condition (overtemperature) clears Operating Temperature Range: Standard industrial range for control equipment Dimensions: Compact relay width approx. 22.5 mm, height ~85.6 mm, depth ~103.7 mm Weight: Around 0.155 kg Typical Applications: Motor overtemperature protection via PTC sensors Overheat monitoring and alarm signaling Control panel motor protection integration Industrial motor starter circuits requiring thermistor monitoring