Why Choose the ABB CM-MPS.31P Three-Phase Monitoring Relay?
The ABB CM-MPS.31P (order code 1SVR740884R1300) is a highly reliable multifunctional three-phase monitoring relay designed to protect industrial electrical equipment against abnormal three-phase supply conditions. As part of the ABB CM-MPS measuring and monitoring relay series, it continuously monitors phase failure, phase sequence, phase unbalance, overvoltage and undervoltage, helping prevent equipment damage and unplanned production downtime.
This advanced monitoring relay provides comprehensive three-phase supply supervision with adjustable voltage thresholds and selectable phase sequence monitoring. Its configurable ON or OFF tripping delay allows users to adapt the response to different industrial applications, reducing unnecessary switching caused by brief voltage disturbances. The relay features two changeover output contacts for signalling and controlling external equipment.
With a rated control supply and measuring voltage of 3 × 160–300 V AC at 50/60 Hz, the ABB CM-MPS.31P is designed for three-phase electrical systems operating within this voltage range. Its compact 22.5 mm DIN rail-mounted housing and ABB Easy Connect push-in terminals simplify installation inside electrical control panels, motor control centres and industrial automation cabinets.
Key Advantages
- Comprehensive three-phase monitoring and protection for industrial electrical systems.
- Detects phase failure, incorrect phase sequence and phase unbalance.
- Monitors overvoltage and undervoltage conditions to help protect connected equipment.
- 3 × 160–300 V AC measuring range suitable for compatible three-phase supply systems.
- Adjustable voltage monitoring thresholds for application-specific protection.
- Selectable ON or OFF tripping delay with an adjustable range of 0.1–30 s or instantaneous operation.
- Two changeover relay contacts provide flexible signalling and control options.
- ABB Easy Connect Technology enables fast, maintenance-free wiring with push-in terminals.
- Compact 22.5 mm housing width saves space inside electrical control cabinets.
- Helps minimise motor damage, equipment faults and costly production interruptions.
Key Features
- ABB CM-MPS multifunctional three-phase monitoring relay series.
- 3 × 160–300 V AC rated control supply and measuring voltage.
- 50/60 Hz rated supply frequency.
- Integrated phase failure detection.
- Selectable phase sequence monitoring.
- Adjustable overvoltage and undervoltage monitoring.
- Integrated phase unbalance detection with adjustable threshold.
- 2 changeover (SPDT) relay output contacts.
- 250 V AC / 4 A contact rating.
- Instantaneous or adjustable 0.1–30 s tripping delay.
- Selectable ON-delay or OFF-delay operation.
- Front-mounted adjustment controls for monitoring parameters.
- Integrated LED indicators for supply, fault and relay status.
- Push-in connection terminals using ABB Easy Connect Technology.
- Compact DIN rail-mounted enclosure.
- Optional sealable transparent cover to protect settings against unauthorised adjustment.
- Designed for reliable operation in industrial electrical environments.
Technical Specifications
- Manufacturer: ABB
- Series: CM-MPS Three-Phase Monitoring Relays
- Model: CM-MPS.31P
- ABB order code: 1SVR740884R1300
- Product group: 310921 – Measuring & Monitoring Relays
- Product type: Multifunctional three-phase monitoring relay
- Rated control supply voltage: 3 × 160–300 V AC
- Measuring voltage range: 160–300 V AC (line-to-line)
- Rated frequency: 50/60 Hz
- Monitored system: Three-phase AC
- Monitoring functions: Phase failure, phase sequence, phase unbalance, overvoltage and undervoltage
- Overvoltage threshold: Adjustable
- Undervoltage threshold: Adjustable
- Phase unbalance threshold: Adjustable
- Phase sequence monitoring: Selectable
- Tripping delay: 0 s or 0.1–30 s
- Delay function: Selectable ON or OFF tripping delay
- Start-up delay: 200 ms
- Relay outputs: 2 changeover contacts (2 SPDT)
- Contact rating: 250 V AC / 4 A
- Rated operational current AC-12: 4 A at 230 V AC
- Rated operational current AC-15: 3 A at 230 V AC
- Rated operational current DC-12: 4 A at 24 V DC
- Rated operational current DC-13: 2 A at 24 V DC
- Terminal technology: Push-in / screwless terminals
- Connection system: ABB Easy Connect Technology
- Mounting type: DIN rail mounting
- Housing width: 22.5 mm
- Dimensions (H × W × D): 85.6 × 22.5 × 103.7 mm
- Protection rating: IP50 housing / IP20 terminals
- Operating ambient temperature: −25 to +60 °C
- Storage temperature: −40 to +85 °C
- Rated insulation voltage: 600 V
- Approximate net weight: 0.133 kg
- GTIN / EAN: 4016779852036
- Applicable standards: IEC/EN 60255-27, IEC/EN 61000-6-2, IEC/EN 61000-6-3, UL 508 and CAN/CSA C22.2 No. 14
Reliable Three-Phase Monitoring for Industrial Electrical Systems
Three-phase monitoring relays such as the ABB CM-MPS.31P continuously evaluate the electrical condition of a three-phase power supply. Industrial motors, pumps, compressors and production machinery depend on stable voltage levels and correct phase relationships for reliable operation. Phase loss, incorrect phase sequence, excessive voltage imbalance or abnormal supply voltage can cause overheating, reduced performance and premature equipment failure.
The CM-MPS.31P detects these conditions and changes the state of its relay outputs when a monitored parameter exceeds its configured threshold. The output contacts can be integrated into contactor control circuits, PLC inputs or alarm systems, allowing connected equipment to be disconnected or a warning to be generated. Its adjustable overvoltage, undervoltage and phase unbalance thresholds allow protection settings to be adapted to the operating requirements of the installation.
The selectable ON or OFF tripping delay helps coordinate the relay response with industrial processes and reduce unwanted switching during short disturbances. Its dual changeover contacts enable separate control and signalling functions, while the compact enclosure and push-in terminals support efficient panel assembly and maintenance. The CM-MPS.31P is therefore a practical monitoring solution for industrial automation engineers, machine builders and electrical maintenance professionals working with compatible three-phase power systems.
Typical Applications
- Three-phase electric motor protection and monitoring.
- Industrial motor control centres and electrical distribution panels.
- Pump stations and water treatment equipment.
- Compressors and industrial refrigeration machinery.
- Conveyor systems and material handling equipment.
- Industrial fans, blowers and ventilation systems.
- Manufacturing and production machinery.
- Phase sequence verification for rotating equipment.
- Voltage imbalance monitoring in industrial power systems.
- PLC-based automation and equipment fault signalling.
- OEM machinery and industrial control panel manufacturing.
- Preventative monitoring of three-phase electrical installations.
