Electronic trip unit with dedicated override current sensor

H - Electricity – 02 – H

Patent

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Details

H02H 3/08 (2006.01) G01R 15/18 (2006.01) H01F 38/30 (2006.01) H02H 3/093 (2006.01) H02H 1/00 (2006.01)

Patent

CA 2258179

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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