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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.


  • 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

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