ABB Feeder Protection REF611 Digits Relay


Technical Parameters

Linux system

Unique Smartlink technology

SSL data encryption

Support 4G full network pass

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ABB Feeder Protection REF611 Digits Relay


ABB REF611 Numerical Relay is a dedicated feeder protection relay designed for the protection, control, measurement and supervision of utility substations and industrial power systems.
The feeder protection relay ABB REF611 can be supplied either with directional or non-directional overcurrent and earth-fault protection. Directional earth-fault protection is mainly used in isolated neutral or compensated networks, whereas the non-directional earth fault protection is intended for directly or low-impedance earthed neutral networks.


Feeder protection relay

Product benefits

  • Pre-configured functions for feeder protection application
  • The relays are delivered pre-configured 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