Thermal override for static trip circuit breakers
US4288770A · kind A · utility
7Cited by
5References
10Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 28, 1979 |
| Grant date | Sep 8, 1981 |
| Priority date | — |
| Expiry date | Nov 28, 1999 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H71/40
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A flux shifting type trip device, which is electrically activated under the control of a static trip unit to mechanically initiate tripping of a circuit breaker automatically in response to an abnormal current condition in a protected circuit, is equipped with a thermal responsive element operative to directly, mechanically activate the trip device and thereby initiate circuit breaker tripping automatically in response to an excessive ambient temperature condition within the circuit breaker enclosure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.