Patent ID: 8692149

Claim:
A switchgear assembly comprising: a vacuum interrupt chamber; and at least one short-circuiting device arranged in the vacuum interrupt chamber, the at least one short-circuiting device including: a fixed contact piece arranged in a vacuum area of the vacuum interrupter chamber; a moving contact piece; a unit for causing the moving contact piece to close onto the fixed contact piece; a membrane sub-dividing the vacuum area in which the fixed contact piece is arranged, the membrane having a breaking line which is configured to be penetrated during a switching operation when the moving contact piece is moved through the membrane and closed onto the fixed contact piece; and a piston-cylinder arrangement connected to the moving contact piece, the piston-cylinder arrangement having an electrically conductive piston arranged on a running surface of the moving contact piece and makes an electrically conductive connection with the moving contact, the piston at least partially surrounding the moving contact piece along a lengthwise axis, being configured to be acted on by the unit for causing the moving contact piece to come into contact with the fixed contact piece, and having a cutting edge on a lower face of the piston in proximity to the breaking line of the membrane, wherein the cutting edge is configured to pass through the breaking line of the membrane during operation.