Abstract: A ground fault detector for an AC circuit is responsive to resistive ground fault current but not to capacitive ground fault current. Current in the AC circuit is sensed and a corresponding signal current is produced. The direction of the signal current is reversed in each alternate half AC cycle without reversing the signal current in each intervening half cycle, the unreversed and the reversed signal current is averaged, and the presence of averaged signal current above a predetermined value is sensed to indicate significant resistive ground fault current.

Abstract: An apparatus for detecting a ground fault in an ungrounded DC power supply system having a DC power supply connected by positive and negative lines to a load, an AC voltage is selectively applied between a positive line and ground or between a negative line and ground. A current sensor including an electrical coil surrounding the positive and negative lines is responsive to significant alternating current in one of the lines, when the AC voltage is applied to the line and the line has a ground fault, to thereby indicate the fault.

Abstract: A fuseholder assembly for a fusible loadcenter is described. The assembly comprises a fuse unit and a base member. The fuse unit includes a pair of spaced apart U shaped fuse clips axially aligned about the longitudinal axis of a cartridge fuse. The fuse clips each have two mutually opposed wing contact portions that are substantially parallel to the longitudinal axis. The broad contacting surface area of the wing contact portions are capable of making contact with a load or line contact. The base member has an opening therein for receiving the fuse unit. The base member has a load and line contact each of which includes a base portion and two resilient side strips that are closely adjacent to each other. Each side strip is independently biased towards the opening in the base member and lies on a plane normal to the longitudinal axis.