ABB 1SVR550801R9300 CM-MSE Thermistor Motor Protection Relay 1NO 220-240V AC PTC Relay

The ABB CM-MSE (SKU: 1SVR550801R9300) is a thermistor motor protection relay designed to safeguard electric motors from overheating by monitoring PTC thermistor signals embedded in motor windings. Featuring a single normally-open (1NO) output contact and a rated supply voltage of 220–240V AC, the CM-MSE provides reliable thermal protection in control panels and industrial automation systems. Its compact 22.5 mm width makes it ideal for DIN rail installation in space-constrained enclosures.

Technical Specifications

Certifications & Standards

• UL 508: Listed to UL standard for industrial control equipment (USA)
• cUL: Canadian UL certification for industrial control equipment
• CSA: Certified to Canadian Standards Association requirements
• CE: Compliant with European Union directives for electrical equipment
• UKCA: UK Conformity Assessed marking for Great Britain market
• CCC: China Compulsory Certification for the Chinese market
• RoHS: Compliant with EU Restriction of Hazardous Substances directive
• REACH: Compliant with EU REACH regulation on chemical substances

Applications & Use Cases

• Motor winding temperature monitoring via embedded PTC thermistors
• Thermal overload protection for AC motors in industrial drive systems
• Control panel integration for motor starters and soft starters
• Protection of pumps, fans, compressors, and conveyor drives
• Industrial automation and process control environments

Frequently Asked Questions

What type of sensor does the CM-MSE work with?

The CM-MSE is designed to work with PTC (Positive Temperature Coefficient) thermistors embedded in motor windings, providing accurate and responsive thermal protection.

What is the output configuration of the CM-MSE relay?

The CM-MSE features one normally-open (1NO) output contact, which opens when the thermistor detects an over-temperature condition, triggering a motor shutdown signal.

Is the CM-MSE suitable for DIN rail mounting?

Yes. At only 22.5 mm wide, the CM-MSE is designed for standard DIN rail installation and integrates easily into compact control panels.