ABB 1SVR730884R1300 CM-MPS.31S Three-Phase Monitoring Relay 2C/O 160-300V AC 0.1-30s Phase Sequence Failure Protection

The ABB CM-MPS.31S (SKU: 1SVR730884R1300) is a multifunctional three-phase monitoring relay that protects motors, machinery and control panels against phase failure, phase sequence errors, phase unbalance and over/undervoltage in three-phase systems rated 3 × 160–300 V AC. Part of ABB's CM-MPS series, the CM-MPS.31S has a dual change-over (2 C/O, SPDT) output rated 250 V / 4 A and an adjustable ON or OFF tripping delay from instantaneous to 30 s, with screw-type double-chamber cage terminals for reliable panel wiring.

Technical Specifications

Certifications & Standards

• IEC/EN 60255-27: Measuring relays and protection equipment, product safety requirements
• IEC/EN 61000-6-2 / 61000-6-3: EMC immunity and emission generic standards
• IEC/EN 63000: Technical documentation for RoHS compliance
• IEC 60715: DIN rail mounting dimensions
• UL 508 / CAN/CSA C22.2 No. 14: Industrial control equipment, cULus listed (E140448)
• CB Certificate: IECEE CB scheme (DK-27947-UL)
• DNV GL: Type approved for marine and offshore applications
• CCC: China Compulsory Certification
• CE: EU Declaration of Conformity
• UKCA: UK Conformity Assessed
• RoHS / REACH: Compliant (EU Directive 2011/65/EU and 2015/863)

Applications & Use Cases

• Motor protection against phase loss, phase sequence reversal, unbalance and over/undervoltage
• Industrial control panels monitoring 3 × 230 V AC three-phase supply integrity
• HVAC systems, pump and compressor stations requiring phase supervision
• Marine and offshore power distribution (DNV GL approved)
• Manufacturing automation lines with critical three-phase machinery

Frequently Asked Questions

What voltage range does the CM-MPS.31S monitor?
The CM-MPS.31S monitors and is supplied from a three-phase system of 160–300 V AC line-to-line (L1-L2-L3), i.e. 3 × 230 V AC networks. For 3 × 400 V AC networks use the CM-MPS.41S (1SVR730884R3300).

What does the 2 C/O output mean?
2 C/O means two changeover (SPDT) relay outputs, each with a normally open (NO) and normally closed (NC) contact rated 250 V / 4 A, for fault signalling or machine shutdown.

Which faults does it detect?
Phase failure, incorrect phase sequence, phase unbalance and over-/undervoltage, with adjustable threshold values. Phase sequence monitoring can be switched on or off.

Can the tripping delay be adjusted?
Yes. The ON or OFF tripping delay is adjustable from instantaneous (0 s) up to 30 s (0.1–30 s range).

Is the CM-MPS.31S approved for marine applications?
Yes. It carries DNV GL type approval, making it suitable for marine and offshore installations.