Electric fuse having heat retaining means

Details Electric fuse having heat retaining means Electric fuse having heat retaining means

1978-01-27

1979-08-28

Broome, Harold

Electricity: electrothermally or thermally actuated switches

Electrothermally actuated switches

Fusible element actuated

337166, 337295, H01H 8504

Patent

active

041662679

ABSTRACT:
A time-lag fuse of the type including a fusible element proper, and heat dams formed by strips of sheet metal folded in a direction transversely to the direction of the fusible element proper impeding the axially outer heat flow from said fusible element proper. The fusible element proper has several straight edges extending parallel to the axis of the casing of the fuse. Points of the heat dams engage the inner surface of the casing of the fuse and thus ensure correct positioning of the fusible element proper, i.e. in such a way that its edges extend always parallel to, and are equidistantly spaced from, the axis of the casing. The heat dams engage the inner surface of the casing at discrete points only, to minimize the area of engagement between said heat dams and the inner surface of the casing and to thus minimize direct heat flow from one to the other.

REFERENCES:
patent: 1968763 (1934-07-01), Hanson et al.
patent: 3143615 (1964-08-01), Kozacka
patent: 3261952 (1966-07-01), Kozacka
patent: 3291943 (1966-12-01), Kozacka
patent: 3319028 (1967-05-01), Kozacka
patent: 3935553 (1976-01-01), Kozacka et al.

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