Erosion resistant high current draw-out fuseholder

Details Erosion resistant high current draw-out fuseholder Erosion resistant high current draw-out fuseholder

1987-12-24

1989-02-28

Broome, H.

Electricity: electrothermally or thermally actuated switches

Electrothermally actuated switches

Fusible element actuated

337204, 337251, H01H 8516, H01H 8502

Patent

active

048089648

ABSTRACT:
A draw-out fuseholder 10 is made containing a first, electrically conductive metal fuse contact 11 having an outer chamfer 12 and a circumferential top surface 13, a second, extended, electrically conductive metal fuse contact 14 having an inner chamfer 15, an outer chamfer 16, and a circumferential top surface 17, and insulating tube 18 comprising fiber reinforced, thermoset resin between the fuse contacts, where the top of the insulating tube has a sharp edge 19 and discontinuity 20 near the second fuse contact inner chamfer 15, and where the ratio of first fuse contact exposed length 25: second fuse contact exposed length 26 is from 1:1.3 to 1:2.5. This fuseholder 10 can be placed in the housing 32 of a draw-out device 30, where housing contact sets 39 and 40 mate with the fuse contacts 14 and 11 in an at-rest position.

REFERENCES:
patent: 1853093 (1932-04-01), Steinmayer
patent: 2781434 (1957-02-01), Swain
patent: 3222482 (1965-12-01), Hitchcock
patent: 3911385 (1975-10-01), Blewitt et al.
patent: 3979709 (1976-09-01), Healey, Jr.
patent: 4320375 (1982-03-01), Lien
patent: 4625196 (1986-11-01), Muench et al.
patent: 4628292 (1986-12-01), Muench et al.

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