Circuit interrupter
US4325041A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 6, 1980 |
| Grant date | Apr 13, 1982 |
| Priority date | — |
| Expiry date | Nov 6, 2000 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H71/7445
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The disclosed circuit interrupter comprises a magnetic core structure including a magnetic core and magnetic yokes defining an annular magnetic gap around the core, and a primary and a secondary coil wound on the core to form a current transformer. The movable contact arm is disposed in the magnetic gap to be magnetically driven to the open position, and a magnetic armature of an instantaneous trip means is disposed adjacent to the magnetic yokes so that it is magnetically actuated upon a short-circuit current. A bimetallic element of a thermally responsive trip means is electrically connected to the secondary coil of the transformer. The magnetic yokes include extended portions which serve as magnetic means for driving an electric arc established between the separated contacts into an arc extinguisher which is also disposed between the magnetic yokes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.