Overcurrent protection for circuit interrupting devices

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

2005-04-20

2009-12-29

Nguyen, Danny (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

C361S044000

Reexamination Certificate

active

07639461

ABSTRACT:
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.

REFERENCES:
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patent: 5642248 (1997-06-01), Rosenbaum et al.
patent: 5844759 (1998-12-01), Hirsh et al.
patent: 6831819 (2004-12-01), Nemir et al.
patent: 7099130 (2006-08-01), Angle et al.
patent: 2005/0280961 (2005-12-01), Campolo

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