25-10-2014, 03:04 PM
Abstracts: Many of our costly appliances require three phase a.c supply for operation. Failure of any of the phases Makes the appliance protection functioning and of paramount importance to monitor the availability of the three phase supply and switch off the appliance in the event of failure one or two phases. The power of the appliance should resume with the availability of the all phases of the supply with certain time delay in order to avoid surges and momentary fluctuations.