ABB Measuring and Monitoring Relays

By October 4, 2021ABB, All Products, Products
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.

Main benefits

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

Main features

• 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


Products Offering


ABB’s CM range offers a wide selection of powerful, compact devices for the monitoring of currents and voltages in single-phase AC/DC systems. All come in a housing that is just 22.5 mm wide. This product range includes current and voltage monitoring relays for over- and undercurrent protection, over- and undervoltage protection and phase loss monitoring – from 3 mA to 15 A and from 3 V to 600 V. ABB’s CM range gives your electric installation the highest safety and reliability.

Main benefits

• Safe and reliable voltage and current monitoring
• Easy Connect Technology push-in terminals
• Withstands highest vibrations
• Easy adjustments via front potentiometer

Main features

• Over-/undercurrent monitoring
• Over-/undervoltage monitoring
• AC/DC signal measurements
• True RMS measuring principle
• Window monitoring (upper and lower threshold at the same time)
• Easy Connect Technology with push-in terminals
• Double-chamber cage connection terminals


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.

Main benefits

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

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


Reliable grid feeding monitoring according to your local standards

ABB’s CM-UFD range are multi-functional grid feeding monitoring relays, installed between the renewable energy system and the public grid. They detect unusual events in the public power grid and automatically disconnect and reconnect the renewable power plant. Different monitoring functions such as 10-minutes average value, real time over- and undervoltage as well as over- and underfrequency are configurable via the front face display. Versions with a Modbus RTU communication interface are available as well.

Main benefits

• Safe and reliable monitoring of all important grid parameters
• High on grid times increase your revenues
• Latest approvals supports your installation complies to your local grid feeding standard

Main features

• Modbus RTU interface enables remote visualization and storage of process data as well as remote tripping
• Easy to configure due to backlit LCD display
• LOM (Loss of mains) protection, e.g. ROCOF and Vector shift detection
• Monitoring of voltage and frequency in single- and three-phase mains
• Error memory for up to 99 entries (incl. cause of error, measured value, relative timestamp)
• Password protection
• Connection to ABB AbilityTM Electrical Distribution Control System


ABB’s CM-IWx insulation monitoring relays for IT systems provide continuous, reliable monitoring. The devices recognize insulation faults as they develop, tripping as soon as the value falls below minimum set thresholds. This makes systems more reliable and prevents interruptions caused by severe secondary insulation faults. Make your monitoring more secure and your maintenance smarter with CM-IWx insulation monitoring relays.

Main benefits

Continuous operation
• Reduced downtime with early pre-warnings
• More time for planned maintenance
• Early fault detection with monitoring of voltage-free networks
• Variants with rail and ship approvals available

Safety and Protection

• Safe and reliable insulation fault detection
• Compliance with latest standards
• Solutions for standard and challenging applications
• Fast, reliable earth fault detection supports fire prevention
• Self-diagnosis and interrupted wire detection

Easy installation

• Clear visualization of device status via LEDs
• Easy adjustments with rotary wheels
• Push-in terminals

Main features

• System voltage monitoring up to 1500 V DC and 1100 V AC
• System leakage capacitance monitoring up to 3000 µF
• Versatile system monitoring for 2-wire, 3-wire, 4-wire, and battery systems
• Easy-to-configure interrupted wire detection
• Easy-to-configure non-volatile fault storage

Protecting motors against overheating

ABB’s CM-MSx.xx range of thermistor motor protection relays monitor the winding temperature of motors. PTC sensors integrated in the motor windings directly measure the motor heat. This direct temperature measurement enables the thermistor motor protection relays to evaluate various motor conditions such as overheating, overload and insufficient cooling. ATEX approval is also available for products used in hazardous areas.

Find out ABB’s solution can make your motor operations more reliable.
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Main benefits

• Reliable motor operation
• Easy status indication and troubleshooting
• Operation in hazardous areas possible

Main features

• Dynamic interrupted wire detection
• Wide control supply voltage range of 24-240 V AC/DC
• Short circuit monitoring of the sensor circuit
• Non-volatile fault storage
• Remote reset
• Screw connection or Easy Connect push-in technology available

Temperature monitoring relays-abb

Two ranges of temperature monitoring relays meet the needs of your applications


The innovative CM-TCN temperature monitoring relays can be configured either via a back-​lit LCD or smartphone app. Parametrization and configuration are just one touch away with the ABB EPiC app – even in a non-​powered state – reducing installation time by 80%. And with just one relay covering a wide range of application, stocks can be reduced significantly, making ABB’s Smart monitoring relays a true game changer.

The well-established and proven CM-TCS range monitors and measures the temperatures of solids, liquids and gaseous media using a variety of different sensors. Overtemperature and undertemperature monitoring as well as open- or closed-circuit principle monitoring can be configured for any device quickly and easily.  When the temperature falls below or exceeds the set threshold value, output relays change position according to your configured functionality and the front-face LEDs show the current status.

High-performance monitoring of liquid levels

ABB’s liquid level monitoring relays are used for regulation and control of liquid levels and mixture ratios for conductive fluids. The range includes single function and multifunctional devices that can be used for overflow, dry-running protection of pumps, filling and draining applications as well as maximum and minimum level alarms. A wide selection of accessories complete the offer.

Main benefits

• Latest approvals for reliable use worldwide
• High EMC immunity due to advanced measurement technology supports reliability in harsh conditions
• Easy to adjust via front side potentiometer
• Easy to install with Easy Connect push-in technology
• Tool-free mounting and demounting

Main features

• Wide range power supplies such as 24–240 V AC/DC
• Adjustable measurement sensitivity
• Adjustable response sensitivity
• Compact housing, 22.5 mm wide

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