The Model GFIR0100 Ground Fault Indicator & Relay unit is a split core transformer system illustrated in the drawing tab. The device combines a current transformer, fault level circuitry, dual relays and a reset feature. The unit is totally water proof according to IP-68 including the external control cable. The relays will close for any fault current impulse starting at a threshold of about 100A and will also close for any current as high as 7500A ( tested for 3 cycles). Two relay Form C 2A rated contacts are provide for external control of indicators such as LEDs or horns. The GFIR is designed to be mounted outdoors inside switch yards or other distribution centers. External reset control wire are provided to reset the relays.