Voltage relay REU610

REU610 is a voltage relay for system voltage protection, measurement and supervision in utility and industrial power systems.

Not active product since 2017

REU610 is a member of ABB’s Relion® product family and part of its 610 product series. The series includes protection relays for feeder protection, motor protection and general system voltage supervision. The plug-in design facilitates the commissioning of the switchgear and enables fast and safe insertion and withdrawal of plug-in units.

REU610 is designed for distribution substation busbar over-voltage and under-voltage protection, feeder and power transformer over-voltage protection, motor under-voltage protection, and capacitor bank protection and supervision. In isolated neutral power systems, it is also used for non-discriminative earth-fault protection, based on residual voltage measurement. REU610 is used for initializing automatic substation busbar changeover and for disconnecting small power units from the public network, that is, islanding.


  • Voltage protection relay 

Product benefits

  • The compact design makes it suitable for both new and retrofit installations
  • Quick and easy routine maintenance thanks to the removable plug-in design
  • Complete type test certified by KEMA
  • Certificated for marine and off-shore use by Det Norske Veritas (DNV) 

Product features

  • Protection for utility distribution and basic industrial applications
  • REU610 offers integrated protection functions including two-stage overvoltage protection, two-stage undervoltage protection and two-stage residual overvoltage protection. Furthermore, REU610 includes two mutually exclusive protection functions, a single-stage negative phase-sequence overvoltage protection function or a single-stage positive phase-sequence undervoltage protection function.
  • REU610 supports a wide range of standard communication protocols, including IEC 61850, IEC 60870-5-103, Modbus®, Profibus, DNP3, SPA and LON.

Are you looking for support or purchase information?

Loading documents

Related offering

Select region / language