Electric fuse having helically wound fusible element and process

Details Electric fuse having helically wound fusible element and process Electric fuse having helically wound fusible element and process

1975-07-10

1977-01-04

Broome, Harold

Electricity: electrothermally or thermally actuated switches

Electrothermally actuated switches

Fusible element actuated

337252, H01H 8504

Patent

active

040017486

ABSTRACT:
A fuse for elevated circuit voltages having a fusible element that is substantially in the shape of a helix and is, in essence, supported only by the pulverulent arc-quenching filler of the fuse, i.e. which is supported without resort to a mandrel of electric insulating material around which the fusible element is wound. The casing of the fuse is sealed to preclude the escape of hot arc products by circular disks of asbestos fibers and by ferrules mounted on the ends of the casing. Plug terminals performing that sealing function are dispensed with. The steps involved in assembling the fuse are described in detail.

REFERENCES:
patent: 3333336 (1967-08-01), Cameron et al.
patent: 3680019 (1972-07-01), Kozacka
patent: 3831126 (1974-08-01), Wakui
patent: 3848214 (1974-11-01), Salzer
patent: 3866318 (1975-02-01), Kozacka

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