Patent · US Expired

Electrical contact construction for air-blast circuit breakers

US4321439A · kind A · utility

3Cited by

1References

4Claims

0Family size

Assignee

Siemens Aktiengesellschaft · DE

Inventors

Rudiger Hess · Berlin, DE
Heiner Marin · Berlin, DE

Key dates

Filing date	Nov 1, 1979
Grant date	Mar 23, 1982
Priority date	—
Expiry date	Nov 1, 1999

Classification

Technology area (CPC H)Electricity
CPC primaryH01H33/7053
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

An electrical contact construction for air-blast circuit breakers, particularly blast-piston or "puffer" type breakers, which subject the arc drawn during current interruption to a compressed-gas blast as well as a magnetic-force effect which lengthens the arc. To increase the interruption capacity of such breakers, and particularly to improve arc behavior during the interruption process, a tubular member is disposed within the interior spaces of the tubular contacts of such a breaker in which the switching gases flow. The member has an inner surface which is conically shaped and is matched to the contour of openings provided in nozzle members disposed at the end faces of the tubular contacts to improve gas flow.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.