Circuit interrupter with improved adjustable trip unit
US4181922A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 23, 1977 |
| Grant date | Jan 1, 1980 |
| Priority date | — |
| Expiry date | Nov 23, 1997 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H2071/006
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A circuit interrupter includes an adjustable trip unit for tripping the circuit breaker to the open circuit position upon overload current conditions. The trip unit includes a shorting plug adjuster comprising a pair of connecting pins electrically connected together and insertable into cooperating sockets in the trip unit housing. One of the pins is common to all adjustment positions and is of greater length, having a retaining clip at the end thereof to permit the adjuster to be partially withdrawn, pivoted about the common pin, and inserted into the desired position. The adjuster comprises a flange which covers the trip unit panel socket in all positions, thereby providing protecting against dust and other contamination. The adjuster is cheaper and more reliable than the prior art, providing increased protection against shock, vibration, and contact bounce.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.