Siemens Aktiengesellschaft

Rudiger Hess

Heiner Marin

Horst Kippenberg

Reiner Muller

Irmo Paulus

Hannelore Schnodt

Contact pieces for vacuum switchgear comprise a base material with additives of readily vaporizable components to produce a sufficiently conductive switch path in the switch-off process. It is desired to have an overvoltage-free switching behavior for the vacuum switchgear. The additives are concentrated in a firmly adhering layer covering the switching surface of the contact piece. Such contact pieces can be manufactured in particular by direct fusing of the additives on the surface, by fusing a separate application of the additives in powder form, in granulate form or as foil or sheet on the surface or alternatively by vapor deposition of the additives on the switching surface of a given contact piece body of base material. Advantageously, a CuCr contact piece base material is used.

Contact pieces for vacuum switchgear, and method for the manufacture

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.

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Berlin, Germany

Rudiger Hess