H - Electricity – 01 – H
Patent
H - Electricity
01
H
306/149
H01H 85/08 (2006.01) H01H 85/143 (2006.01) H01H 85/165 (2006.01) H01H 85/00 (2006.01)
Patent
CA 1081295
CURRENT LIMITING FUSE Abstract of the Disclosure A modular fuse subassembly of a full-range, current limiting fuse includes a main fuse element helically wound about a gas-evolving spider and connected to element termination plates mechanically attached to each end of the spider, and an auxiliary fuse element, electrically isolated from the main element, which is also helically wound about the spider and connected at one end to a contact button centrally disposed at one end of the spider. The modular subassembly is positioned within a sand-filled fuse tube sealed at both ends by brass end caps which are magnetically formed and epoxied thereon. The main fuse element is electrically connected at each end to a respective end cap by terminal tabs of the element terminations which extend through matching openings in the caps, and are soldered therein. One end cap includes a centrally disposed contact button which is electrically connected to an outside surface of the end cap by a high resistance vent wire extending through a passage in the end cap, and which makes electrical contact with the contact button of the modular subassembly to thus connect the auxiliary element to the outside surface of one of the end caps. The fuse can be made watertight by positioning elastomeric gaskets between the caps and the tube which are compressed during the forming operation, and by filling the vent wire passage in the end cap with elastomeric material.
296615
Hassler Stephen P.
Huber William J.
Majewski John V.
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