Electric fuse for compensating heating in the center of the fusi

Details Electric fuse for compensating heating in the center of the fusi Electric fuse for compensating heating in the center of the fusi

1980-12-08

1982-03-09

Broome, Harold

Electricity: electrothermally or thermally actuated switches

Electrothermally actuated switches

Fusible element actuated

337159, 337279, H01H 8504, H01H 8512

Patent

active

043192130

ABSTRACT:
An electric fuse, in particular an electric time-lag fuse, comprising a tubular casing, a pair of terminal elements, a granular arc-quenching filler, and a pair of parallel fusible elements inside the casing interconnecting the pair of terminal elements. Each of the pair of fusible elements has a plurality of juxtaposed points of reduced cross-section. Juxtaposed points of reduced cross-section support an M-effect causing overlay thereon. Each of the M-effect causing overlays extends from a pair of juxtaposed points of reduced cross-section in opposite directions longitudinally of said pair of fusible elements. A substantially E-shaped member of a solid gas-evolving material having three arms is associated with said pair of fusible elements. One of said three arms is interposed between said pair of fusible elements at the region thereof where the juxtaposed points of reduced cross-section are located. One of each of the two remaining arms of the substantially E-shaped member is arranged close to said parallel fusible elements and extends at right angles to edges formed by them. The aforementioned three arms are tied together by a fourth arm, at right angles to the aforementioned three arms, so that a substantially E-shaped solid is formed.

REFERENCES:
patent: 3935553 (1976-01-01), Kozacka et al.
patent: 4167723 (1979-09-01), Wilks

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