Contact assembly for high voltage fuse

Details Contact assembly for high voltage fuse Contact assembly for high voltage fuse

1976-11-11

1978-08-22

Harris, George

Electricity: electrothermally or thermally actuated switches

Electrothermally actuated switches

Fusible element actuated

337253, 337413, H01H 8516

Patent

active

041092279

ABSTRACT:
In a high voltage expulsion type fuse, a fusible element is connected between an arcing rod and a contact element. The arcing rod is biased for movement by a spring, and when the fuse is assembled, the contact element is pulled through the fuse compressing the spring until the contact element is pulled partially through an opening in a contact bridge which is threaded into the metal exhaust ferrule of the fuse. Once the contact element is in the correct position, the bridge is swaged to attach the element to the bridge. The element has tapered grooves at the end that is inserted into the bridge so that when the bridge is swaged, the tapered grooves tend to force the contact element further into the opening so that a shoulder on the element remains firmly against the bridge. A threaded member attached to the end of the element may be engaged to pull the element through the bridge. After the bridge has been swaged, the thread member is broken off since it is no longer needed.

REFERENCES:
patent: 2289207 (1942-07-01), Papp
patent: 2325540 (1943-07-01), Pittman et al.
patent: 3855563 (1974-12-01), Cameron et al.

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