Means for detecting the contact wear of electrical switching devices
US4532499A · kind A · utility
17Cited by
1References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 26, 1983 |
| Grant date | Jul 30, 1985 |
| Priority date | — |
| Expiry date | Sep 26, 2003 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H9/168
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
In a means for detecting the wear of a current interrupting contact (4) there is used a light conductor (12) as a connecting link between the contact (4) and a detector (20) arranged at ground potential. The light conductor is inserted into an aperture (11) provided from the rear side of the contact, the bottom of said aperture being positioned at the level corresponding to a worn out contact. When the wear has grown so great that the light conductor (12) is exposed, the light or heat of the breaking arc will generate or interrupt a light signal, which via the light conductor is transmitted to the detector.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.