Undervoltage control apparatus for circuit interrupter
US4205361A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 21, 1978 |
| Grant date | May 27, 1980 |
| Priority date | — |
| Expiry date | Mar 21, 1998 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H47/325
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Apparatus for undervoltage control of a circuit breaker includes a holding coil, a switching transistor connected in series with the holding coil, and a rectifier providing pulsating DC voltage. A level detector responsive to the output voltage of the rectifier produces an actuating signal for the switching transistor when the rectifier output voltage rises above a predetermined value. A switching regulator is provided which is connected to the level detector and the switching transistor for modulating the actuating signal when the voltage to the rectifier input rises above a predetermined value. The switching transistor is thus rendered periodically non-conducting to regulate the average voltage appearing across the holding coil.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.