Ground fault circuit interrupter and electronic module therefor
US3953766A · kind A · utility
31Cited by
7References
24Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 16, 1974 |
| Grant date | Apr 27, 1976 |
| Priority date | — |
| Expiry date | Sep 16, 1994 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02H3/17
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An electronic module for ground fault circuit interrupters (GFCI) in both circuit breaker and receptacle configurations includes a signal processor having a plurality of fault signal threshold stages for differentially charging an integrating capacitor in accordance with the magnitude of the fault signal as amplified by a high gain differential amplifier. The accumulated charge on the integrating capacitor controls the generation of a trip signal. The processor also includes a highly stable grounded neutral excitation oscillator and a noise rejection network to combat nuisance tripping.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.