BE1-81O/U, Digital Frequency Relay

These relays provide accurate and secure protection for underfrequency or overfrequency system conditions.


  • Accurate, repeatable, and reliable operation.
  • Incrementally-staged load shedding possible with up to four independent frequency setpoints.
  • Flexible protection options with selectable overfrequency or underfrequency sensing for each setpoint.
  • Clear settings indication from individually adjustable time delays and LED indicators for each frequency set point.
  • Minimized PT costs as a result of low sensing burden.
  • Reduced battery load with low burden power supply.
  • LED targets provide clear annunciation of status.
  • Easily perform in-case system and device tests using test paddles.


Technical Resources


Case Studies