Electrical fuse with indicator
US6456189B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 28, 2000 |
| Grant date | Sep 24, 2002 |
| Priority date | — |
| Expiry date | Apr 11, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H85/30
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An electric fuse is comprised of a tubular fuse casing formed of an electrically insulating material. A first conductive component is attached to a first end of the casing and a second conductive component is attached to a second end of the casing. A first conductive path is formed through the tube between the first and second conductive components. The conductive path includes a fusible element having a first resistance. A second conductive path is formed along the exterior of the tubular fuse casing. The second conductive path is in parallel to the first conductive path and has a second resistance greater than the first resistance. The second conductive path includes an indicator component. The indicator component is comprised of first layer comprised of a colored material, and a second layer comprised of an electrically conductive material deposited onto the first layer. The second layer has a region of increased resistance. An inner cavity is located above the region of increased resistance on the second layer. A third layer comprised of a transparent, polymeric material covers the cavity and the first and second layers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.