Abstract: A ground fault isolation system and ground fault isolation circuit for isolating ground faults in electrical subsea conductor lines. The system includes a main power hub, a plurality of digital controllers operatively connected to the main power hub via electrical subsea conductor lines, and a ground fault isolation circuit. The ground fault isolation circuit includes a plurality of loads connected to a ground fault detection circuit, each load including one relay on the positive power bus and one relay on the negative power bus. The ground fault detection circuit is connected to a DC to DC isolation circuit that prevents a main power bus ground fault in the event of a ground fault on one of the loads. The relays are connected to a digital controller on the other end, which isolates a load when a ground fault is detected, but powers the remaining unaffected loads.