Fuse with overstoichiometric amount of oxidant
US6515570B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 8, 2000 |
| Grant date | Feb 4, 2003 |
| Priority date | — |
| Expiry date | Mar 21, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H2085/0008
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A fuse has a fuse element (6), composed of silver, with constrictions (7) which follow one another at regular intervals, and which fuse element makes contact with a combustible element (8), preferably over its entire length. The combustible element (8) is composed of a combustion compound, which is essentially of a fuel such as guanidine or a guanidine derivative and a metal such as Mg or Al and an oxidant such as KNO3, NaNO3, NH4NO3, KClO4, NaClO4, KMnO4, the proportion of which is overstoichiometric by a factor of at least 1.1, and preferably of at least 10. The combustible compound also preferably contains a binding agent such as paraffin, a thermoplastic or an elastomer, so that it can be extruded. It has an ignition temperature of between 160° C. and 260° C. and emits more than 200 J/g of heat, so that it ignites even in the event of small overcurrents and melts the entire length of the fuse element (6).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.