Electronic trip unit with dedicated override current sensor
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United States of America Patent
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-
Aug 24, 1999
Grant Date -
N/A
app pub date -
Jan 12, 1998
filing date -
Jan 12, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An electronic trip unit for a circuit breaker having two current sensors per phase, wherein the first magnetic core current transformer is designed to monitor current in the normal and overcurrent range, and the second low-permeability core sensor is designed to produce an override trip signal at or below the short time withstand current rating of the circuit breaker. In a second embodiment the electronic trip unit includes only the low-permeability core sensor that has negligible output in the normal current range.
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