Electrical device comprising a PTC polymer element for overcurrent fault and short-circuit fault protection
US6429766B1 · kind B1 · utility
4Cited by
12References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 24, 2001 |
| Grant date | Aug 6, 2002 |
| Priority date | — |
| Expiry date | Jan 24, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01C7/027
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The invention relates to an electric device with a PTC polymer element having a constriction. The constriction defines a web extending in a main current direction over a length longer than in the prior art, namely longer than 5 mm, preferably longer than 15 mm. Further, the aperture angle of the PTC polymer material at the ends of the web is larger than 100°. A preferred choice of material is given, further. The invention achieves very high voltage-withstand capabilities.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.