Electrical switching apparatus, circuit interrupter and method of interrupting overcurrents of a power circuit
US7518475B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 24, 2007 |
| Grant date | Apr 14, 2009 |
| Priority date | — |
| Expiry date | Dec 3, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H2071/124
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A circuit interrupter includes a housing, separable contacts, and an operating mechanism including a latch. The operating mechanism opens the contacts responsive to actuation of the latch. A trip mechanism cooperates with the latch to trip open the contacts. The trip mechanism includes a thermal overload mechanism actuating the latch responsive to a thermal fault caused by current flowing through the contacts, a solenoid cooperating with the thermal overload mechanism to actuate the latch responsive to the electromagnetic device being energized, and a processor repetitively determining a value of the current flowing through the contacts, determining if the value exceeds a predetermined value for a number of occurrences, and responsively energizing the solenoid, in order to actuate the latch contemporaneous with actuation of the latch by the thermal overload mechanism, in order to decrease the time to trip open the contacts.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.