The MGFR series of ground fault relays are microprocessor based relays that measure the ground fault current from the secondary of a zero sequence current sensor connected to the relay. When a ground fault occurs, the relay computes the RMS value of the fault current. If the fault current is above the level of the pick up setting of the relay, the trip unit operates to open a circuit breaker in accordance with a set of programmable time current characteristics.

The MGFR series has five basic models each with eight discrete pick-up and time settings. The range of the pick-up settings varies from model to model. The entire series covers the range from 10mA to 1200 amps.

pick-up settings from 10mA to 1200 amps with discrete time settings

visual display of leakage current measured by the zero sequence current sensor

Suitable for use on solidly grounded and resistance grounded systems

Time coordinated protection and zone selective instantaneous trip modes available