The Shield takes guesswork out of finding source of faults. Each feeder on control panel has its own light, which will indicate by name which feeder has fault. UL listed intelligent detector has PulserPlus controls and handles Wye and Delta systems of any size. High-resistance unit includes split core CTs and can be used for voltages of 13.8 kV, 7.2 kV, 4,160 V, 2,400 V, 600 V, and 480 V.