Electric current limiting fuse having a filter disposed in one end cap
US3967228A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 9, 1975 |
| Grant date | Jun 29, 1976 |
| Priority date | — |
| Expiry date | Oct 9, 1995 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H85/18
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The fuse is of the type including an electrically insulating cartridge, a pair of electrically conductive terminal caps at opposite ends of the cartridge, a fusible element within the cartridge in electrical contact with the terminals, and a self-supporting bound matrix filler of arc-quenching particulate matter. The improvement comprises that one of the terminal end caps has a filter disposed on its inside end surface over a drain port. Also disclosed is a method of manufacturing a fuse. The method comprises the steps of assembling the components, packing with arc-quenching particulate matter, filling with a suspension of colloidal silica, removing excess suspension, and drying. In filling, the colloidal silica suspension is forced into a fill port in one end cap and released through a drain port in the other end cap. Before passing out through a drain port in the other end cap, the suspension passes through a filter disposed on the inside end surface of the end cap and overlapping the drain opening.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.