Voltage protection and control REU615 IEC

Compact and versatile solution for utility and industrial power distribution systems

REU615 is a voltage protection and control relay for voltage and frequency-based protection in utility and industrial power distribution systems, including networks with distributed power generation. REU615 is also ideal for voltage regulation.

REU615 is a member of ABB’s Relion® product family and part of its 615 protection and control series of relays.


  • Voltage and frequency protection as well as automatic voltage regulation of power transformers with a motor-driven on-load tap changer

Product features

  • Exclusively designed for automatic and manual voltage regulation, or alternatively for busbar under voltage and overvoltage supervision, load shedding and restoration
  • Ready-made standard configurations for fast and easy setup with tailoring capabilities
  • Withdrawable plug-in unit for swift installation and testing
  • Large graphical display showing customizable SLDs, accessible either locally or through an easy-to-use web-browser-based HMI
  • Extensive life-cycle services

Product benefits

  • Extensive range of protection and control functionality for busbar voltage supervision, load shedding and restoration, including over frequency and under frequency protection for power generators and other AC equipment
  • Automatic voltage regulation of power transformers with a motor-driven on-load tap changer
  • Optional arc protection and high-speed outputs (not with automatic voltage regulator)
  • Supports IEC 61850 Editions 1 and 2, including HSR and PRP, GOOSE messaging and IEC 61850-9-2 LE for less wiring and supervised communication
  • IEEE 1588 V2 for high-accuracy time synchronization and maximum benefit of substation-level Ethernet communication
  • Supports Modbus, DNP3 and IEC 60870-5-103 communication protocols

Are you looking for support or purchase information?

Have you seen REX615, the next step for our 615 and 620 series relays?

Go to REX615

Technical documentation portal

The newest technical documentation In English for this product is on our technical documentation portal. On this portal, you can quickly search topics in all available technical documentation. You can also print topics of your choice to PDF format. As a registered user you will be able to bookmark and add your own comments in your own personal book. You can save the documents you need the most as collections and you can use them also in offline mode.

ABB Library

In ABB Library you can find other product related material. For now, please also use ABB Library to find technical documentation of earlier product versions.
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