Electrical switching apparatus including a trip coil open circuit test circuit and system including the same
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United States of America Patent
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May 7, 2013
Grant Date -
Mar 11, 2010
app pub date -
Sep 8, 2008
filing date -
Sep 8, 2008
priority date (Note) -
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Abstract
A circuit breaker includes separable contacts, an operating mechanism structured to open and close the separable contacts, and a trip circuit including a trip coil and a fault detector. The fault detector energizes the trip coil to cause the operating mechanism to open the separable contacts. A test circuit is structured to test the trip coil and determine an open circuit condition thereof. An annunciation circuit is structured to annunciate the open circuit condition of the trip coil.
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