Overvoltage protection device
US4544983A · kind A · utility
16Cited by
7References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 28, 1983 |
| Grant date | Oct 1, 1985 |
| Priority date | — |
| Expiry date | Apr 28, 2003 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02H9/06
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An overvoltage protection device, for protecting communications equipment against hazardous voltages cue to lightning or power surges, comprises a primary protector, for example a gas tube device, and a back-up protector connected in parallel. The back-up protector includes a semiconductor pn junction, and is preferably a pair of diodes back-to-back. The back-up protector has a breakdown voltage slightly higher than that of the primary protector and is arranged to fail short-circuit once it has operated so as to provide an indication that the primary protector failed to operate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.