H - Electricity – 01 – H
Patent
H - Electricity
01
H
317/11, 306/118
H01H 85/02 (2006.01) H01H 33/666 (2006.01) H01H 85/46 (2006.01) H02H 3/16 (2006.01)
Patent
CA 1167906
CIRCUIT PROTECTING APPARATUS INCLUDING RESETTABLE VACUUM FUSE AND SWITCH Abstract of the Disclosure A current-responsive, resettable, vio- lence-free low fault range vacuum-type switch interrupter is disclosed which is especially designed for series connection with a high fault range current limiting fuse (CLF) to achieve an improved, full range circuit protecting device adapted for use in padmounted, oil filled switch gear apparatus or the like. The resettable switch includes a spring-loaded, over center toggle motive assembly along with a current-responsive, temperature sensitive, bimetallic U-shaped latch- ing element; in the event of a fault, the element deforms and releases the motive assembly to quick- ly open the vacuum contacts without the violence or oil contamination associated with fuse links. Manual opening of the contacts, and resetting thereof after either manual or fault-induced contact opening, is achieved through appropriate manipulation of an external, trip-free operating handle. The switch further includes a weighted, shock-absorbing element for slowing the contacts just prior to engagement thereof during the switch closing sequence, and a novel, high-impact hammer arrangement for breaking any contact welds during the fault-induced operation of the switch. The resettable switch-CLF combination is synergis- tically coordinated such that the switch is oper- ated when it experiences the characteristic let through current incident to the operation of the CLF, so as to enhance the overall protective Docket 16905 result. In three-phase systems where each phase conductor is separately protected, the respective switches may be advantageously gang coupled to operate together, even if only one conductor experiences a fault.
373051
Bruning Armin M.
Kamp Eugene L.
Popeck Charles A.
A. B. Chance Company
Gowling Lafleur Henderson Llp
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