Electric current limiting fuse having a filter disposed in one e

Details Electric current limiting fuse having a filter disposed in one e Electric current limiting fuse having a filter disposed in one e

1975-10-09

1976-06-29

Harris, George

Electricity: electrothermally or thermally actuated switches

Electrothermally actuated switches

Fusible element actuated

337414, H01H 8514

Patent

active

039672280

ABSTRACT:
The fuse is of the type including an electrically insulating cartridge, a pair of electrically conductive terminal caps at opposite ends of the cartridge, a fusible element within the cartridge in electrical contact with the terminals, and a self-supporting bound matrix filler of arc-quenching particulate matter. The improvement comprises that one of the terminal end caps has a filter disposed on its inside end surface over a drain port.
Also disclosed is a method of manufacturing a fuse. The method comprises the steps of assembling the components, packing with arc-quenching particulate matter, filling with a suspension of colloidal silica, removing excess suspension, and drying. In filling, the colloidal silica suspension is forced into a fill port in one end cap and released through a drain port in the other end cap. Before passing out through a drain port in the other end cap, the suspension passes through a filter disposed on the inside end surface of the end cap and overlapping the drain opening.

REFERENCES:
patent: 3465275 (1969-09-01), Swain
patent: 3479630 (1969-11-01), Kozacka

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