Method and apparatus for magnetically tripping circuit breakers
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United States of America Patent
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Apr 11, 2006
Grant Date -
Dec 16, 2004
app pub date -
Mar 4, 2004
filing date -
Mar 13, 2003
priority date (Note) -
In Force
status (Latency Note)
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Abstract
An apparatus for interrupting an electrical short circuit current in an electrical distribution system having a plurality of phases is disclosed. The apparatus includes a housing, a plurality of separable conduction paths, an operating mechanism in operable communication with the plurality of conduction paths, an electronic trip unit in signal communication with each of the plurality of conduction paths and in operable communication with the operating mechanism, and an electromagnetic trip unit in signal communication with each of the plurality of conduction paths and in operable communication with the operating mechanism. The electromagnetic trip unit is configured to be operably responsive to a first half-cycle waveform of the short circuit current prior to the electronic trip unit being operably responsive to a second multi-cycle waveform of the short circuit current.
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