External neutral current sensor matched to a circuit breaker

Details External neutral current sensor matched to a circuit breaker External neutral current sensor matched to a circuit breaker

2009-07-22

2011-12-20

Levi, Dameon (Department: 2835)

Electricity: electrical systems and devices

Housing or mounting assemblies with diverse electrical...

For transformer

C361S001000, C361S837000, C324S127000

Reexamination Certificate

active

08081491

ABSTRACT:
A highly accurate current sensing transformer, such as an external neutral current transformer (ENCT), accommodates a wide range of loads. The ENCT includes a housing, first and second terminals each having an end portion extending from and external to the housing, a conductor for carrying a current to be measured, and a current sensor having an aperture for receiving the conductor and having a central axis. The conductor joins the first and second terminals to form a current path that passes through the aperture. Increased accuracy is achieved by arranging the conductor such that a portion thereof passing through the aperture forms a substantial angle relative to the central axis, such that the entry angle of the current path via the conductor through the aperture of the current sensor of the ENCT matches an entry angle of a conductor through an aperture of a current sensor in the electronic trip unit to which the ENCT is attached. Other features resist rotation of the terminals during attachment of the ENCT and allow the ENCT to receive any of a variety of different lugs or terminal nuts, enabling easy attachment.

REFERENCES:
patent: 7557563 (2009-07-01), Gunn et al.
patent: 7969140 (2011-06-01), Teppan
patent: 2009/0174508 (2009-07-01), Watford et al.
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Selected pages from Catalog for PowerPact® M-, P- and R-Frame, and Compact® NS630b-NS3200 Circuit Breakers; (Aug. 2009) (5 pages).
Selected pages from Catalog for Electronic Trip Molded Case Circuit Breakers; (2002) (5 pages).

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