Electricity: electrothermally or thermally actuated switches – Electrothermally actuated switches – Fusible element actuated
Patent
1977-03-11
1979-04-17
Harris, George
Electricity: electrothermally or thermally actuated switches
Electrothermally actuated switches
Fusible element actuated
337252, H01H 8516
Patent
active
041503538
ABSTRACT:
A full-range, current limiting fuse which includes a modular fuse subassembly which can be assembled with any pair of several types of paired end caps to construct any one of several types of fuses. This modular subassembly 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.
This 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 to hermetically seal the openings. One of these end caps 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 to form watertight seals, and by filling the vent wire passage in the end cap with elastomeric material. During a fuse operation, the vent wire is vaporized to produce a vent hole for gases generated within the fuse and to give indication of the fuse operation.
REFERENCES:
patent: 3243552 (1966-03-01), Mikulecky
patent: 3333336 (1967-08-01), Cameron et al.
patent: 3962666 (1976-06-01), Knapp
patent: 4010438 (1977-03-01), Scherer
patent: 4063208 (1977-12-01), Bernatt
Hassler Stephen P.
Huber William J.
Majewski John V.
Gealow Jon Carl
Harris George
LaPorte Ronald J.
McDonald Thomas E.
McGraw-Edison Company
LandOfFree
Current limiting fuse does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Current limiting fuse, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Current limiting fuse will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1264377