Vacuum fuse

Details Vacuum fuse Vacuum fuse

1986-10-14

1987-12-15

Broome, Harold

Electricity: electrothermally or thermally actuated switches

Electrothermally actuated switches

Fusible element actuated

200144B, H01H 8504

Patent

active

047136448

ABSTRACT:
A vacuum fuse (10) including a pair of arcing electrodes in the form of parallel, confronting, spaced apart disks (13, 14) supported on the inner ends of aligned contact rods (11, 12). The confronting surfaces of the electrodes define an arc gap (18) and are provided with a plurality of arcuate slots (54). A fusible element (19) projects from bores (23, 24) which are recessed relative to the confronting disk surfaces to bridge the arc gap and it and the arcing electrodes (13, 14) are electrically connected to the contact rods (11, 12). The fusible element (19) is flattened at the mid-point of the arc gap and a hole (22) is drilled in the flattened section. The outer housing (1) of the fuse (10) includes a metallic housing member (7) and ceramic end plates (4, 6). Use of a metallic housing (7) eliminates the need for a separate, axial, metallic shield to prevent deposition of vaporized metallic particles during current interruption. The electrical and structural connections are brazed with a vacuum being pulled on the fuse interior during the brazing operation. All structural elements are arranged with the longitudinal axis of the final assembly as the reference point.

REFERENCES:
patent: 3913047 (1975-10-01), Arthur et al.
patent: 4414448 (1983-11-01), Kashimoto et al.

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