Fusible element for a current-limiting fuse having groups of spa

Details Fusible element for a current-limiting fuse having groups of spa Fusible element for a current-limiting fuse having groups of spa

1982-10-29

1984-11-06

Harris, George

Electricity: electrothermally or thermally actuated switches

Electrothermally actuated switches

Fusible element actuated

337290, 337292, H01H 8504

Patent

active

044814950

ABSTRACT:
A fusible element for a current-limiting fuse comprises a metal ribbon having groups of holes therethrough and therealong. The distance along the ribbon between adjacent holes in a group is less than the distance along between adjacent groups. The lateral width of the ribbon between the hole groups is greater than its laterial width where the holes are located. The ribbon initially melts at the holes and multiple arcs burn back the ribbon at a first rate until the ribbon containing the holes is consumed, following which merger of the arcs occurs. This merger and the greater width of the ribbon between the groups results in burn-back of the ribbon at a second reduced rate. In this way, both 9 kv and 15 kv fault currents may be interrupted without exceeding the spark-over voltage of phase-to-ground arrestors when 9 kv fault currents are interrupted.

REFERENCES:
patent: 2883891 (1958-05-01), Jacobs
patent: 4041435 (1977-08-01), Gaia
patent: 4123738 (1978-10-01), Huber

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