Voltage protection REU611

REU611 a dedicated voltage protection relay, preconfigured for voltage- and frequency-based protection in utility substations and industrial power systems

REU611 is designed for overvoltage and undervoltage protection, sequence protection, residual overvoltage and additional two-stage frequency protection of large-size power stations or small power units. The voltage protection relay is used for a wide variety of applications, including busbar, power transformer, motor and capacitor bank applications.

REU611 is a member of ABB's Relion® family and part of its 611 protection and control product series.


  • Voltage protection relay

Product benefits

  • Pre-configured functions for voltage protection application
  • The relays are delivered preconfigured and factory-tested to shorten engineering and commissioning time
  • Self-healing communication based on HSR/PRP using an optional second Ethernet bus
  • The compact design makes it suitable for both new and retrofit installations
  • Withdrawable plug-in unit design for swift installation and testing

Product features

  • Pre-configured voltage-based protection unit for utility distribution and industrial applications
  • Powerful and user-friendly web-browser-based human machine interface (HMI) including input/output (I/O) matrix with visual selections
  • Application-specific standard configurations resulting in a shorter relay setup and commissioning time
  • Supports IEC 61850 Editions 1 and 2, including binary GOOSE messaging
  • Pre-configured solutions for utility distribution and industrial applications

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