Surge protection element for telephone lines, or data transmission lines or the like
US4729055A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 12, 1987 |
| Grant date | Mar 1, 1988 |
| Priority date | — |
| Expiry date | Jun 12, 2007 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02H9/06
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The surge protection element comprises an inert gas-filled protective device with electrodes inserted between two line input terminals, these terminals being connected respectively to branch terminals of an installation to be protected. The surge protection element also comprises initial protection apparatus, intended to be inserted between the terminals of the installation to be protected, and having a response time and a voltage threshold below that of said protective device, and also decoupling apparatus connected in series between the terminals of the protective device and those of the initial protection apparatus. The decoupling apparatus are capable of causing the voltage to rise at the terminals of the protective device when the current strength passing through the initial protection means increases, whereby the protective device can be tripped and can take over from the initial protection apparatus.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.