Contact control assembly for a circuit breaker
US4149129A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 8, 1977 |
| Grant date | Apr 10, 1979 |
| Priority date | — |
| Expiry date | Jun 8, 1997 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H2069/013
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The following specification describes a magnetic assembly for use in controlling the main contacts of a circuit breaker. The magnetic assembly includes a yoke, an armature for attraction to the yoke to move an operating lever and a pivotable adjustment arm. The lever operates the trip crossbar, which opens the main contacts and is in turn pivotably carried by the adjustment arm. One end of the operating lever is held against longitudinal movement relative the trip crossbar, when the adjustment arm is pivoted to calibrate the circuit breaker. The lever therefore pivots on the adjustment arm to move the armature towards or from the yoke to control the armature air gap without altering the lever travel distance to the crossbar. The armature is also mounted on the lever for relatively linear movement in relationship to the yoke. The main contacts include a stationary contact, which is engaged by the mass of a spring supported floating arc quenching magnet that serves to absorb the shock of contact closure for reducing contact bounce.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.