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DBF Digital Breaker Failure - Legacy

DBF Digital Breaker Failure
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Manufacturing for this product has been discontinued. As an alternative, please refer to the 8 Series and UR Family relays.

The DBF is a digital breaker failure relay that provides phase and ground backup protection if the primary circuit breaker fails to clear a system fault.

Protection and Control
  • Two step instantaneous and/or time delayed breaker failure
  • Phase instantaneous overcurrent
  • Ground instantaneous overcurrent
  • Three phase direct trip
  • Internal arcing protection
  • Operation failure detection
  • Three settings groups
  • 14 configurable inputs
  • Monitoring and Metering
  • Current metering
  • Breaker health monitoring
  • Event recorder, last 165 events