Bell alarm for circuit breaker
US4246557A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 26, 1979 |
| Grant date | Jan 20, 1981 |
| Priority date | — |
| Expiry date | Jun 26, 1999 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H2071/467
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A multipole circuit breaker having a single contact operating mechanism for all poles and a fault current sensing means for automatic tripping of the breaker is provided with alarm switch means to indicate when opening of the circuit breaker has been caused by a fault condition. The operating mechanism includes a metal frame to which a latchable cradle is pivotally mounted. The frame includes parallel guide slots through which a formed pin actuator extends to be moved by the cradle as it operates between its latched and released (tripped) positions. A spring connected between the mechanism frame and the pin actuator biases the latter toward the cradle. An insulating extension element is adjustably mounted on the actuator to transmit motion of the latter to operate a switch in an alarm circuit, in accordance with cradle position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.