Overcurrent protection device
US5858454A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 27, 1996 |
| Grant date | Jan 12, 1999 |
| Priority date | — |
| Expiry date | Dec 27, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H85/0411
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An overcurrent protection device and a method for the production thereof is provided wherein a fusible link is bonded across a pair of electrodes. A composite layer envelops the fusible link and is formed from a gelatinous composition. The composite layer and the fusible link are further encased within a molded housing. The gelatinous composition includes a nonconductive inorganic powder and a synthetic resin. The inorganic powder has a melting temperature below a fusion temperature of the fusible link. In an embodiment, the inorganic powder includes lead glass powder and alumina powder, and the synthetic resin is a low viscosity silicone resin. The inorganic powder is mixed with the silicone resin in a three to one ratio. Heat treatment dries the composite layer. The composite layer includes air pockets between particles of the inorganic powder elastically bound together by the synthetic resin. The air pockets support fusion combustion of the fusible link, contribute to the elasticity of the composite layer, and provide spaces for melted portions of said fusible link to flow into. The elasticity of the composite layer absorbs stresses thereby protecting the fusible link from damag…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.