Electric fuse having helically wound fusible elements
US4210892A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 12, 1979 |
| Grant date | Jul 1, 1980 |
| Priority date | — |
| Expiry date | Feb 12, 1999 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H85/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
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…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.