Ground fault circuit breaker with ground fault trip indicator
US3970975A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 5, 1975 |
| Grant date | Jul 20, 1976 |
| Priority date | — |
| Expiry date | May 5, 1995 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H83/226
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A circuit breaker module and a detector module are mounted side by side to form a ground fault interrupter. The detector module includes an electromagnet for mechanical engagement with operation of the automatic trip device of the circuit breaker to open the latter upon the occurrence of predetermined ground fault conditions. An indicator member is pivotally mounted between the detector and circuit breaker modules. When the electromagnet is energized, it moves the indicator member from a retracted to an indicating position. In the latter position a portion of the indicator member is readily visible to indicate that tripping has resulted from a ground fault rather than from an overload.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.