Solid-state trip unit for DC circuit breakers
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United States of America Patent
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-
Sep 11, 1990
Grant Date -
N/A
app pub date -
Jul 3, 1989
filing date -
Jul 3, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A contactor includes two DC sensors within the housing which are isolated from the tripping unit, from the power supply and from each other by the combination of a transformer and photoelectric coupling, the sensed signals being pulse width modulated and demodulated on the respective sides of the photoelectric coupling barrier.
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