The phase unbalance feature will protect motors of any size against:
Excessive temperature rise due to unbalanced supplies ( e.g. a 10% unbalanced supply can increase the temperature rise by 150%)
The regenerated voltage generated during a single phase failure when running at low load.
  • Portable pumps
  • Portable compressors
  • Motors - Single Phasing
  • Gensets - correct engine rotation
  • All portable equipment
  • All rotating machines
  • Adjustable set point
  • Adjustable time delay
  • LED trip indication
  • 2 pole relay contacts
  • Internal Differential
  • Auto Reset
Principle of Operation
The protector comprises monitoring circuits for voltage phase reversal and phase unbalance. Outputs from these circuits are fed to a comparator which changes state under fault conditions.
When the comparator trips, the output relay will de-energise after a preset time delay & the red LED will then no longer be lit.
The relay and LED will automatically energise again when all the supply parameters have returned to safe and acceptable limits.