Fuse tube with mildly tapered bore

Details Fuse tube with mildly tapered bore Fuse tube with mildly tapered bore

1980-03-24

1982-01-26

Beha, Jr., William H.

Electricity: electrothermally or thermally actuated switches

Electrothermally actuated switches

Fusible element actuated

337282, H01H 8538

Patent

active

043131000

ABSTRACT:
A single-vented fuse tube has a bore lined with an arc-extinguishing material. A movable contact moves away from a stationary contact in the bore and toward and out of an exhaust opening. An arc established between the contacts causes de-ionizing arc-extinguishing gases to evolve from the bore. The gas is exhausted from the exhaust opening. The bore is mildly tapered--to about 1.degree. to 3.degree. of included angle--so that its greatest diameter is at the exhaust opening. The included angle and extent of the taper are sufficient to obviate stagnation of the gases evolved deep within the bore and clogging of the bore.

REFERENCES:
patent: 2231508 (1941-02-01), Schultz
patent: 2247702 (1941-07-01), Ramsey
patent: 2901573 (1959-08-01), Gesellschap

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