Apparatus operating an isolation switch in coordination with a circuit breaker
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United States of America Patent
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May 30, 2006
Grant Date -
Oct 14, 2004
app pub date -
Apr 10, 2003
filing date -
Apr 10, 2003
priority date (Note) -
Expired
status (Latency Note)
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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 .alpha. degrees, where .alpha. is less than 180.degree. and is 90.degree. in the exemplary embodiment. A common fixed load contact is located angularly between, and spaced .alpha. degrees from, both the fixed line and ground contacts so that the shaft is rotated only .alpha. 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.
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