Proprietary microcontroller based circuitry, constant monitoring of 1-phase, low voltage, voltage unbalance, phase reversal, harmful power line conditions|Auto-sensing wide voltage range, automatically senses system voltage between 190 to 480 VAC, saves setup time|Advanced LED diagnostics, quick visual indicator for cause of trip, LED indications include, normal operation, power-up restart delay, reverse phase trip, unbalance/single phase trip, high or low voltage trip|Adjustable trip delay prevent nuisance tripping due to rapidly fluctuating power line conditions|Low/high voltage 4 s (standard), unbalance and phasing faults 2 s|Has variable restart delay (manual or adjustable 2 to 300 s)