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Model no:165A Three single phase transformers are wired in star input and star output having input 220 volt and output at 12 volt. The contact relays which are used energized from the output of comparators in the event of fault conditions by tracking the input voltage conditions for each phase at the input of the comparators. Two 555 timers are used, one in monostable and the other in astable mode to drive a power relay that handles the load. Volt meters can be used to indicate the voltage while ammeter may be used to indicate the ground fault current for secondary. However Set of switches are used to introduce LL fault, LG fault ,3L short to get the comparator output to drive both the relays to disconnect the load. Short duration fault returns the load immediately while long duration shall result in permanent trip. For more info visit http://www.efxkits.com; http://www.facebook.com/edgefx