Cutout fuse tube having a mildly tapered bore

Details Cutout fuse tube having a mildly tapered bore Cutout fuse tube having a mildly tapered bore

H - Electricity

01

H

306/124

H01H 85/38 (2006.01) H01H 85/43 (2006.01)

Patent

CA 1145798

ABSTRACT OF THE DISCLOSURE 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° to 3° 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.

373576

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