2kyokunosetsuchijikoshadansochono chuseitensetsuchikenshutsukikudokairo

摘要

A ground fault detector for a three-wire single phase A.C. system including protector means to maintain level of performance in the event the neutral is grounded on the load side of the detector is provided with solid state switching means which maintains the protector means energized so long as at least one hot wire of the A.C. system is energized.