Electricity: electrical systems and devices – Safety and protection of systems and devices – Ground fault protection
Patent
1998-08-05
1999-12-07
Sherry, Michael J.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Ground fault protection
361 936, 361 937, 361 938, 361 939, 361106, H02H 300
Patent
active
059993847
ABSTRACT:
A circuit protection apparatus employs a PTC element for overload and/or short circuit protection and an arcing fault interruption arrangement. The circuit protection apparatus may be employed in a ground fault receptacle for interrupting the flow of electrical current in a line in response to any of a plurality of different types of fault conditions on the line. The circuit protection apparatus may include a set of contacts connected in series with the line, and having an open position and a closed position, a trip device coupled to the contacts, adapted to be actuated by a trip signal, to move the contacts from the closed position to the open position and an element having a positive temperature coefficient of resistivity (PTC) connected in series with the contacts. The PTC element is connected to the trip device to provide the trip signal to the device in response to overload or short circuit conditions in the line. A switching element is operatively coupled with the trip device for providing the trip signal to said device in response to an actuating signal. An arcing fault circuit is adapted for detecting an arcing fault in the line and producing the actuating signal when the arcing fault is detected.
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Chen William W.
Gregory George D.
Haun Andy A.
Scott Gary W.
Golden Larry I.
Irfan Kareem I.
Sherry Michael J.
Square D Company
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