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CM-MPx & CM-Pxx Three-phase Monitoring Relays

CM-MPx & CM-Pxx is three-phase monitoring relays that guarantee reliable and continuous monitoring of a three-phase network as well as the trouble-free and economic operation of machines and installations.

Reliable monitoring of three-phase mains
The reliable and continuous monitoring of three-phase networks guarantees the trouble-free and cost-effective operation of machines and installations. ABB’s CM-MPS/N three-phase monitoring relays for rated voltage levels up to 820 V AC and 400 Hz offer maximum flexibility and control.

A wide variety of cost-effective three-phase monitoring relays are available with specialized functionality. Most devices are available with two different terminals. You can choose between proven screw connections with double-chamber cage connection terminals and the tool-free Easy Connect Technology’s push-in terminals.


  • Safe, reliable monitoring of key parameters in three-phase networks
  • Easy Connect Technology push-in terminals
  • Withstands highest vibrations
  • Easy adjustments via front potentiometer


  • Over-/undervoltage monitoring
  • Phase failure detection
  • Phase unbalance monitoring
  • Phase sequence monitoring
  • True RMS measuring principle
  • Easy Connect Technology with push-in terminals