Electronic trip unit with dedicated override current sensor

Details Electronic trip unit with dedicated override current sensor Electronic trip unit with dedicated override current sensor

1998-01-12

1999-08-24

Gaffin, Jeffrey

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361 96, 361115, H02H 300

Patent

active

059432047

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.

REFERENCES:
patent: 5276416 (1994-01-01), Ozaki
patent: 5369542 (1994-11-01), Leone et al.
patent: 5650907 (1997-07-01), Ishii et al.

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