Circuit interrupting device
US4220942A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 24, 1978 |
| Grant date | Sep 2, 1980 |
| Priority date | — |
| Expiry date | May 24, 1998 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H85/40
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An improved circuit interrupting device includes a pair of contacts which are relatively movable and between which an arc is established. Following melting of a fusible element, a stored energy source relatively moves the contacts apart to elongate the arc, and a container of pressurized dielectric fluid simultaneously directs fluid from a port at the arc. The fluid and the arc elongation ultimately extinguish the arc. A fusible diaphragm normally closes the port to prevent the escape of fluid, and also, due to its mechanical attachment to the contacts, restrains relative movement therebetween. The fusible element is so connected as to normally shunt current through the device away from the diaphragm. When the fusible element melts, all of the current through the device flows through and melts the diaphragm. As the diaphragm melts, two results are effected: fluid is permitted to escape from the port, and relative movement between the contacts occurs.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.