Overcurrent protection for circuit interrupting devices

Details Overcurrent protection for circuit interrupting devices Overcurrent protection for circuit interrupting devices

H - Electricity

01

H

H01H 83/00 (2006.01) H01H 83/02 (2006.01)

Patent

CA 2506007

The present invention is directed to current interrupting devices with overcurrent protection. In one embodiment, a ground fault circuit interrupter (GFCI) is disclosed having both ground fault and overcurrent protection. The GFCI has a current detection circuit that includes a switch connected across the load phase terminal and the line neutral terminal of the device. A comparator compares a predefined threshold voltage to a sensed voltage based on a current through the line and load neutral terminals of the device. If the sensed voltage exceeds the predefined threshold, the comparator causes the switch to conduct thereby tripping the device, disconnecting the load from the line terminals and preventing the overcurrent condition from causing damage to the device and/or load.

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