Electronic trip units powered by current transformers and circuit breakers comprising the same
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United States of America Patent
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Dec 12, 2017
Grant Date -
Sep 22, 2016
app pub date -
Mar 20, 2015
filing date -
Mar 20, 2015
priority date (Note) -
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status (Latency Note)
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Abstract
A circuit breaker includes a set of separable contacts moveable between a closed position and an open position, an operating mechanism configured to open the set of contacts, a conductor coupled to the set of contacts, a current transformer coupled to the conductor, and a trip circuit coupled to the operating mechanism and to the current transformer and configured to cause the operating mechanism to open the set of contacts when a current through the conductor exceeds a current threshold that is greater than a saturation threshold of the current transformer. The trip circuit is further configured to vary the current threshold during an interval following a closure of the set of the contacts and to provide a fixed current threshold thereafter.
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