Patent ID: 6720515
Filing Date: 2004-04-13
Classification: H01H

Abstract:
A vacuum interrupter having three contacts, which are arranged in a cylindrical housing, for carrying out the functions of switching, disconnection and grounding, whereinthe housing has a metallic area in the form of a grounding connection and two areas having insulators, a moving contact and a first stationary contact form a first contact system, and the moving contact and a second stationary contact, which is connected to the grounding contact, form a second contact system, the two contact systems are arranged coaxially with respect to one another and concentrically with respect to an axis of the housing, the first contact system is surrounded by a shield, wherein the first contact system has radial or axial magnetic field contact pieces, and the second contact system has contact pieces which are each arranged by a contact support and are in the form of annular disks, with the contact support of one of the annular contact pieces being arranged on the rear face of the moving radial or axial magnetic field contact, and the contact support of the other contact piece, which is the form of an annular disk, forming the grounding connection, the two insulators are tubular and are connected to one another at ends with the grounding connection interposed therebetween, one of the insulators surrounds the first contact system, and essentially also the moving contact of the second contact system, and the shield is in the form of a labyrinth shielding system in order to physically isolate plasma in the first contact system from plasma in the second contact system, which shielding system comprises a tube which surrounds the first contact system, and, together with the contact support, which is arranged on the moving contact, of the contact piece which is in the form of an annular disk, forms a cap.