Abstract: A compressed gas interrupter having a first contact piece having a hollow wear contact into which, during closure, there is inserted a rod-shaped wear contact provided on a second contact piece, an insulating nozzle on the same axis as the two contact pieces and fixed to the first contact piece with the throat of the nozzle having the wear contact of the second contact piece passing therethrough on closure, the nozzle connecting a gas compression chamber to an exhaust chamber, the wear contact of the second contact piece being movable along an axis and being displaced in the opposite direction to the wear contact of the first contact piece by a rack mechanism organized to transmit movement in opposite directions from the first contact piece to the second contact piece. The rack mechanism is disposed upstream from the throat of the nozzle so as to be situated off the path of the hot gases leaving the nozzle on interruption.

Abstract: The present invention relates to a high-voltage circuit-breaker including a casing that is filled with a dielectric gas and that contains a first arcing contact and a second arcing contact, which arcing contacts are mounted to move in opposite directions from an open position to a closed position and vice versa, the first contact being secured by means of a ring to a tube mounted to slide in a support portion electrically connected to a terminal. Said ring is made of an insulating material, the first contact is extended by a rod that is in alignment with the contact, which rod is disposed on the side of the first contact that is further from the second contact, and is connected to a resistance, and said rod carries a switching member organized to connect said rod directly to said support portion during closure.