Undervoltage release with electrical reset for circuit breaker
US4011484A · kind A · utility
7Cited by
3References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 23, 1976 |
| Grant date | Mar 8, 1977 |
| Priority date | — |
| Expiry date | Feb 23, 1996 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02H3/24
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An undervoltage circuit having a power supply voltage level detector, a reset circuit, and a hold-in circuit. The level detector of the circuit causes an undervoltage coil to trip a circuit breaker when the power being supplied falls below a predetermined voltage level. When power is restored, an automatic reset circuit resets the circuit breakers undervoltage coil at a preset voltage level by applying a repetitive pulse to the coil. The hold-in circuit applies a continuous current to the same coil of the undervoltage circuit to hold it in once it has been reset.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.