PTC circuit protection device comprising mechanical stress riser
US5303115A · kind A · utility
56Cited by
28References
18Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 27, 1992 |
| Grant date | Apr 12, 1994 |
| Priority date | — |
| Expiry date | Jan 27, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02H3/025
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A circuit protection device in which a PTC element made from a PTC composition includes or has at a boundary thereof a mechanical stress riser. The device will be tripped by, and provide reversible protection against, a first set of fault conditions, and will also provide protection at least one time against a second, more severe, set of fault conditions which cause physical disruption of the device and which cause the device to have a substantially infinite resistance. Devices of the invention are useful in protecting against relatively high voltages.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.