Protector unit
US5991136A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 1, 1997 |
| Grant date | Nov 23, 1999 |
| Priority date | — |
| Expiry date | Dec 1, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01T4/06
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A protector unit for use in retrofitting connector blocks, such as a 300-type connector block or a C-50 frame includes a housing; a back-up, fail-safe assembly for providing a connection to ground; and a positive temperature coefficient limiter ("PTCR") for temporarily preventing the passage of current through the protector unit when an over-current condition is detected and for allowing the passage of current through the protector unit when the over-current condition is no longer detected. The back-up, fail-safe assembly permanently prevents the passage of current through the protector unit when a sustained over-current condition is detected.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.