The Omega is a low-cost Earth Fault relay that can be operated from a Bowden Band CT or a conventional cast resin core balance CT. It has a factory pre-set trip current and trip delay, but a user-selectable reset time of three or six hours. It can be powered by a replaceable long-life lithium battery giving a 15 year average life under normal operating conditions or it can be powered from the incoming LV mains, in which case the option for LV supply reset is available. The OMEGA EFI has a high-intensity red LED indicator and an alarm output relay. It also has manual controls for Test and Reset.


  • Earth Fault Indicator
  • Factory selectable for trip current and fault duration
  • User selectable timed reset function for three or six hours
  • Powered from 15 year lithium battery or LV mains
  • LV Reset is available when powered from LV
  • Alarm output relay – changeover Volts free
  • Push button Test & Reset
  • Band sensor CT or Cast Resin CT

OMEGA II  efi – as per Omega I apart from:

  • User selectable trip current between 20 and 100 Amps
  • User selectable fault duration between 40msecs and 200msecs
  • Two alarm output relays with latching or fleeting function
  • User selectable timed reset between 3 and 12 hours
  • Powered and reset from RTU supply option