Electricity: electrothermally or thermally actuated switches – Electrothermally actuated switches – Fusible element actuated
Patent
1979-02-12
1980-07-01
Broome, Harold
Electricity: electrothermally or thermally actuated switches
Electrothermally actuated switches
Fusible element actuated
337159, 337162, 337293, H01H 8504
Patent
active
042108926
ABSTRACT:
An electric fuse for elevated circuit voltages, such as, e.g. 5 to 15 KV. It includes a tubular casing or electric insulating material, terminal elements and a pulverulent arc-quenching filler. It further includes a plurality of equidistantly spaced fusible elements electrically connected in parallel, wound substantially helically in planes defining a prism and forming part of a current path conductively interconnecting the pair of terminal elements.
The point of novelty consists in that the fusible elements are formed by a unitary metal stamping. That stamping also includes aligned metal bridges conductively interconnecting all the fusible elements. The preferred number of planes or sides of the aforementioned prism is four and the preferred number of bridges is n-1 for each quarter turn of the fusible elements, wherein n is the number of fusible elements connected in parallel. The bridges are arranged in spaced relation from the edges of the prism. In case of a four-sided prism one single bridge per plane per quarter turn of the fusible elements may suffice.
The fusible element stamping may also consist of a plurality of fusible element sections whose constituent fusible elements define serially related points of reduced cross-sectional areas which are different for different stamping sections.
REFERENCES:
patent: 4093932 (1978-06-01), Kozacka
patent: 4099156 (1978-07-01), Salzer
patent: 4153892 (1979-05-01), Kozacka
Broome Harold
Gould Inc.
Salzer Erwin
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