US 2004/0201285 A1Published application

Apparatus operating an isolation switch in coordination with a circuit breaker

AssigneeEaton Corporation

InventorsBrad R. Leccia, Paul A. Colbaugh

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Abstract

The movable conductors of a three phase isolation switch are incorporated into the electrically insulative molded shaft, thereby mechanically supporting them and isolating them from the metal axle of the shaft. Movable contacts on the ends of each movable conductor are angularly spaced by α degrees, where α is less than 180° and is 90° in the exemplary embodiment. A common fixed load contact is located angularly between, and spaced α degrees from, both the fixed line and ground contacts so that the shaft is rotated only α degrees between a first, closed position, in which the movable conductors connect the fixed load contact for each phase to the corresponding fixed line contact, and a second, grounded position, where the fixed load contact of each phase is connected by the movable conductor to the corresponding fixed ground contact.

Claims16

Dependent claims

An isolation switch for an electric power circuit having a line conductor, load conductor and ground conductor, the isolation switch comprising:

a housing;
a shaft mounted for rotation about its longitudinal axis within the housing;
and
a pole unit comprising:
a movable conductor carried by the shaft and having a first movable contact at one end and a second movable contact at another end, the first and second movable contacts being angularly spaced in a plane perpendicular to the longitudinal axis of the shaft by angle α;
and
a fixed load contact, a fixed line contact, and a fixed ground contact all mounted in the housing in the plane perpendicular to the shaft with the fixed load contact between and angularly spaced from the fixed line contact and the fixed ground contact by the angle α, the shaft being rotatable to a first position in which the first movable contact engages the fixed load contact and the second movable contact engages the fixed line contact, and a second position α degrees from the first position in which the first movable contact engages the fixed ground contact and the second movable contact engages the fixed load contact.

4 more elements

Dependencies are inferred from the claim text.