Composite circuit protection devices
US4780598A · kind A · utility
135Cited by
21References
27Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 4, 1988 |
| Grant date | Oct 25, 1988 |
| Priority date | — |
| Expiry date | Feb 4, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B2203/02
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Circuit protection devices which comprise a PTC conductive polymer element and a second electrical component which is thermally coupled to the PTC element and which, when a fault causes the current in the circuit to become excessive, generates heat which is transferred to the PTC element, thus reducing the time taken to "trip" the PTC element. The second component is for example a voltage-dependent resistor which is connected in series with the PTC element under the fault conditions and is thus protected from damage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.