ABB 1SVR730830R0500 CM-ESS.MS Voltage Monitoring Relay 2 C/O 3-600V RMS 24-240VAC/DC 4A

The ABB CM-ESS.MS (SKU: 1SVR730830R0500) is a single-phase voltage monitoring relay designed for continuous supervision of AC and DC supply voltages across an exceptionally wide measurement range of 3–600 V RMS. Part of ABB's CM single-phase monitors series, this 2 C/O (2 changeover contact) relay provides reliable over- and under-voltage protection in control panels and industrial automation systems, with a coil supply voltage of 24–240 V AC/DC and a compact 22.5 mm DIN-rail footprint.

Technical Specifications

Certifications & Standards

• CAN/CSA C22.2 No. 14: Canadian standard for industrial control equipment
• IEC/EN 63000: Technical documentation for RoHS compliance assessment
• IEC/EN 60255-27: Mechanical requirements for measuring relays and protection equipment
• IEC/EN 61000-6-2: EMC immunity for industrial environments
• IEC/EN 61000-6-3: EMC emission standard for residential and light industrial environments
• UL 508: Standard for industrial control equipment (USA)
• IEC 60715: DIN rail mounting dimensions for low-voltage switchgear
• EN 60255: Measuring relays and protection equipment
• EN 61000-6: Electromagnetic compatibility general standard
• CSA: Canadian Standards Association certification
• REACH: EU chemical safety regulation compliance
• RoHS: Restriction of Hazardous Substances directive compliant
• cULus: Dual USA and Canadian UL listing
• CCC: China Compulsory Certification
• CE: European conformity marking
• UKCA: UK Conformity Assessed marking for Great Britain market

Applications & Use Cases

• Over-voltage and under-voltage protection in control panels and distribution boards
• Monitoring of single-phase AC supply lines from 3 V to 600 V RMS
• DC bus voltage supervision in industrial automation and drives
• Machine tool and process control cabinet protection
• Building automation and HVAC power quality monitoring
• Protection of sensitive industrial loads against supply voltage deviations

Frequently Asked Questions

What is the measurement voltage range of the CM-ESS.MS?
The CM-ESS.MS monitors voltages from 3 V to 600 V RMS, covering a very wide range suitable for both low-voltage signal circuits and standard 230/400 V mains supplies.

What supply voltage does the CM-ESS.MS require?
The relay operates on an auxiliary/coil supply of 24–240 V AC or DC, making it highly flexible for international applications without the need for separate power supplies.

How wide is the CM-ESS.MS for panel design purposes?
The relay has a standard 22.5 mm width and mounts on a DIN rail per IEC 60715, compatible with industry-standard enclosures and busbar systems.

Is the CM-ESS.MS approved for North American markets?
Yes. The CM-ESS.MS carries cULus listing (UL 508) and CAN/CSA C22.2 No. 14 certification, making it suitable for use in both the United States and Canada.