KRM72x Series
 
KRM72x - PHASE FAILURE / SEQUENCE RELAY
  • Phase failure
  • Phase Imbalance
  • Incorrect Phase Sequence
Description
KRM72x monitors three phase AC supplies for incorrect phase sequence, phase failure and phase imbalance on systems up to 500V.

Operation
A sensitivity adjustment on the top of the unit allows adjustment up to 50% of the phase to phase voltage. The minimum level is selected to avoid any nuisance tripping due to normal variations in voltages.

A factory set delay of approximately two seconds prevents tripping due to transients. The unit is factory set for 50/60Hz.

Green LED indicate the phase sequence and will lit when direction of rotation is correct.

Models:
KRM721 : 100-120VAC, 50/60Hz
KRM722 : 200-240VAC, 50/60Hz
KRM725 : 380-500VAC, 50/60Hz
 
 
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