Adjustable magnetic trip unit and a circuit breaker incorporating the same
US6788174B1 · kind B1 · utility
10Cited by
8References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 3, 2004 |
| Grant date | Sep 7, 2004 |
| Priority date | — |
| Expiry date | Feb 3, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H71/2472
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The magnetic trip device of a circuit breaker has a magnetic pole in which a magnetic field is generated by load current, and an armature assembly that includes: a bracket supported for pivotal movement relative to the magnetic pole; a spring biasing the bracket to a position spaced from the magnetic pole; an armature hinged on the bracket; and an adjusting screw for adjusting a gap between the armature and the magnetic pole for calibrating the trip device without affecting the spring bias, which can be separately and independently adjusted to select the load current at which the magnetic trip is initiated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.