Power vacuum fuse using coaxial cylinders

Details Power vacuum fuse using coaxial cylinders Power vacuum fuse using coaxial cylinders

1975-02-03

1976-04-06

Miller, J. D.

Electricity: electrothermally or thermally actuated switches

Electrothermally actuated switches

Fusible element actuated

337278, H01H 8504

Patent

active

039493415

ABSTRACT:
A power vacuum fuse using coaxial electrodes with the fuse length disposed therebetween. In one embodiment of the invention a larger diameter outer cylinder is partially disposed around a hollow inner cylinder within an evacuated chamber and the fuse links are connected from the inner cylinder to the outer cylinder. The inner cylinder can have spiral or slots formed therein to move the arc as desired. In another embodiment of the invention a solid inner cylinder is disposed within a hollow diameter outer cylinder, which can form or be directly connected to a metallic enclosure. Current paths can be provided into the solid inner cylinder from both ends, thus substantially increasing the current carrying capacity of a given size vacuum fuse. In yet another embodiment of the invention a hollow inner cylinder is partially disposed within a larger diameter outer cylinder. The inner cylinder is connected at one end to a terminal means and the free end thereof has an outward radially extending lip which extends into a folded back hollow cylindrical portion from the inner diameter portion. Thus the hollow inner cylinder provides for an elongated current path in a direction to reduce some magnetic force.

REFERENCES:
patent: 3244839 (1966-04-01), Albright
patent: 3613039 (1971-10-01), Curtis et al.

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