Power distribution system and electrical switching apparatus employing a filter trap circuit to provide arc fault trip coordination
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United States of America Patent
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Oct 18, 2011
Grant Date -
Jun 17, 2010
app pub date -
Dec 17, 2008
filing date -
Dec 17, 2008
priority date (Note) -
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Abstract
An electrical switching apparatus comprises: a first terminal; a second terminal; separable contacts electrically connected between the first terminal and the second terminal; an operating mechanism structured to open and close the separable contacts; and an arc fault trip circuit cooperating with the operating mechanism and structured to trip open the separable contacts responsive to an arc fault condition. An inductor is electrically connected in series between the first terminal and the second terminal. A capacitor includes a first lead electrically connected between the inductor and the second terminal, and a second lead electrically connected to a ground or neutral conductor. The inductor and the capacitor are structured to cooperate with a power circuit impedance downstream of the second terminal to form a filter trap circuit.
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