Phase-to-phase isolation of cassette type circuit breakers

Details Phase-to-phase isolation of cassette type circuit breakers Phase-to-phase isolation of cassette type circuit breakers

2005-08-23

2005-08-23

Barrera, Ramon M. (Department: 2832)

Electricity: magnetically operated switches, magnets, and electr

Electromagnetically actuated switches

Automatic circuit-interrupting devices

C335S006000, C200S244000

Reexamination Certificate

active

06933814

ABSTRACT:
A molded case, cassette type circuit breaker for a multi-pole electrical distribution circuit includes a number of cassettes equal to the number of poles in the multi-pole electrical distribution circuit and a pin disposed through each cassette. The pin is formed from a dielectric material. The pin may be further disposed through a portion of an operating mechanism for aligning the cassettes and the operating mechanism. Each cassette may include a rotor, a pair of electrical contacts, and a contact arm supported in the cassette by the rotor. In this embodiment, the pin may be a cross pin that extends between each rotor. The dielectric material may include phenolic, melamine, silicone, epoxy, polyester, fiberglass and the like. Alternatively, the pin includes a steel bar coated with the dielectric material, where the dielectric material may include, for example, epoxy, silicon, Teflon, and the like. A pair of end caps may be disposed over end surfaces of the rotor. Pole spacing between adjacent cassettes may be about one inch or less while providing sufficient dielectric integrity to meet requirements of the UL 489 standard.

REFERENCES:
patent: 6052046 (2000-04-01), Ennis et al.
patent: 6218919 (2001-04-01), Ciarcia et al.
patent: 6310307 (2001-10-01), Ciarcia et al.

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