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Measuring & Monitoring Relays

No matter what measuring or monitoring function is needed, physical or electrical, ABB protects your equipment and ensures processes run smoothly. ABB relays are designed to detect overloads, temperature, liquid and other potentially damaging fluctuations. Choose from a large range of products that provide reliable protection, cost savings and maximum availability for processes and equipment. No matter what the environment, ABB’s high quality products are built and tested to give you uninterrupted monitoring.


  • Safe and reliable application monitoring
  • Less engineering time required
  • Faster product selection


  • Wide range of products from single- and three-phase monitors to grid-feeding monitoring relays
  • Huge variety of applications covered
  • Value devices (CM-E range)
  • Advanced solutions (CM-S and CM-N range)
  • Easy Connect Technology with push-in terminals
ABB's liquid level monitoring relays are used for regulation and control of liquid levels and mixture ratios for conductive fluids.
CM-Exx and CM-Sxx are the single-phase current and voltage monitoring relays that provide reliable monitoring of voltages and currents by using the TRMS measuring principle.
Reliable insulation monitoring of IT systems
The three-phase monitoring relays of the CM range guarantee reliable and continuous monitoring of a three-phase network as well as the trouble-free and economic operation of…
Protecting motors against overheating
The innovative CM-TCN temperature monitoring relays can be configured either via a back-​lit LCD or smartphone app.
CM-TCS relay range monitors and measures the temperatures of solids, liquids and gaseous media using a variety of different sensors.
The CM-UFx grid feeding monitoring relays monitor voltage and frequency according to the relevant standards for decentral energy generation.