Dual trip circuit for circuit breaker
US5369542A · kind A · utility
12Cited by
2References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 6, 1992 |
| Grant date | Nov 29, 1994 |
| Priority date | — |
| Expiry date | Mar 6, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H71/28
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A trip circuit for tripping a circuit breaker has a first coil having a relatively large number of turns and therefore a relatively slow reaction time and a second coil having a relatively small number of turns and therefore a relatively fast reaction time. The first coil is responsive to a relatively low current level through a circuit breaker for tripping the circuit breaker at the rated tripping current. The second coil is responsive to a higher current through the circuit breaker for tripping the circuit breaker with great rapidity in case the higher level is reached before the first coil has an opportunity to react.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.