Electrical switching apparatus including a second trip circuit responding to failure of a first trip circuit to provide a repetitive signal
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United States of America Patent
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Feb 3, 2009
Grant Date -
Jul 19, 2007
app pub date -
Jan 18, 2006
filing date -
Jan 18, 2006
priority date (Note) -
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Abstract
A receptacle includes separable contacts, an operating mechanism structured to open and close the separable contacts, and two trip circuits. A first microprocessor-based trip circuit includes a first output having a first arc fault/ground fault trip signal, and a second output having a periodic pulsed signal. A second failsafe trip circuit includes an input having the periodic pulsed signal and an output having a second trip signal. The second failsafe trip circuit is structured to output the second trip signal responsive to failure of the first microprocessor-based trip circuit to provide the periodic pulsed signal. A third circuit responds to the first trip signal and the second trip signal and cooperates with the operating mechanism to trip open the separable contacts.
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