ABB 1SVR730885R3300 CM-MPS.21S Three-Phase Monitoring Relay 2 C/O 180-280V AC 0.1-30s Phase Monitoring Relay

The ABB CM-MPS.21S (SKU: 1SVR730885R3300) is a three-phase monitoring relay from the CM-MPS series, designed to detect phase faults, phase asymmetry, and phase sequence errors in three-phase AC power systems rated 3×180–280V AC. Featuring two changeover (2 C/O) output contacts and an adjustable time delay of 0.1 to 30 seconds, the CM-MPS.21S provides reliable protection for motors, pumps, and industrial machinery from damaging supply anomalies. With a compact 97 × 30 × 109 mm DIN rail mount profile, it fits easily into standard control panels.

Technical Specifications

Certifications & Standards

• CE: Conforms to European Union low voltage and EMC directives
• UKCA: UK Conformity Assessed marking for the United Kingdom market
• cULus: Listed to both UL and CSA standards for USA and Canada (UL 508)
• UL 508: Industrial control equipment standard
• CAN/CSA C22.2 No.14: Canadian standards for industrial control equipment
• CSA: Canadian Standards Association certification
• CCC: China Compulsory Certification for the Chinese market
• DNV GL: Certified for marine and offshore applications
• IEC/EN 60255-27: Measuring relays and protection equipment — product safety requirements
• IEC/EN 61000-6-2: Electromagnetic compatibility — immunity for industrial environments
• IEC/EN 61000-6-3: Electromagnetic compatibility — emission standard for residential/light-industrial environments
• IEC/EN 63000: Technical documentation for the assessment of electrical and electronic products regarding RoHS
• IEC 60715: Dimensions of low-voltage switchgear and controlgear — DIN rail mounting
• EN 60255: Measuring relays and protection equipment
• EN 61000-6: Electromagnetic compatibility generic standards
• REACH: Compliant with EU regulation on Registration, Evaluation, Authorisation and Restriction of Chemicals
• RoHS: Restriction of Hazardous Substances directive compliant

Applications & Use Cases

• Motor protection against phase loss, phase asymmetry, and incorrect phase sequence
• Protection of pumps, compressors, and HVAC equipment in industrial installations
• Control panel integration for three-phase power quality monitoring
• Marine and offshore electrical systems (DNV GL certified)
• Building automation and industrial process control panels