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ABB CM-MSS.31S | 3-Phase Monitoring Relay for System Protection

Overview

The ABB CM-MSS.31S is a multifunctional phase monitoring relay for three-phase systems. Designed to monitor phase sequence, loss, and asymmetry in networks ranging from 200 to 500 V AC, it provides reliable protection for motors and critical equipment.

Key Features

• Rated Voltage Range: 200–500 V AC

• Monitoring Functions: Phase sequence, phase loss, and asymmetry

• Trip Delay Adjustment: 0.1–10 seconds

• LED Indicators: Display operational and fault status

• Compact Design: Saves space in control panels

• DIN Rail Mounting: Fast and secure installation

• Output Contact: 1 c/o (SPDT) relay output

• Phase Failure Detection: Independent of load

• Selectable Sensitivity: Fine-tuning for specific applications

Technical Specifications

• Model: CM-MSS.31S

• Supply Voltage: 3-phase, 200–500 V AC

• Frequency: 50/60 Hz

• Output Contact: 1 changeover (SPDT), 250 V AC / 6 A

• Trip Delay: Adjustable from 0.1 to 10 s

• Housing Width: 22.5 mm

• Mounting Type: DIN rail (TH35)

• Ambient Temperature: –20 °C to +60 °C

• Protection Class: IP20 (terminals), IP40 (housing)

• Standards: IEC/EN 60255-1, IEC/EN 60255-26, RoHS

• Certifications: CE, cULus, EAC

Applications

• Motor protection

• Pump systems

• HVAC equipment

• Conveyor belts

• Industrial control panels

Why Choose the ABB CM-MSS.31S?

• Reliable Phase Monitoring: Prevents damage from incorrect phase conditions

• Configurable Delay: Adjustable response for customized protection

• Compact & Easy to Install: Space-saving DIN rail mount

• Universal Voltage Range: Compatible with most global systems

• ABB Assurance: Backed by a world leader in industrial automation

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Global delivery available.