A switch, includes electrical contacts separated by a contact gap, a tubular guide disposed around at least one of the electrical contacts axially movable between an open position retracted from the contact gap and a closed position bridging the contact gap, a blast cylinder disposed radially outward of the tubular guide and defining a compression volume therebetween, the blast cylinder axially movable in coordination with the tubular guide between the open position and the closed position, an isolating ring coupled to a tubular guide end, and a blast cylinder bottom ring coupled to a blast cylinder end, the blast cylinder bottom ring and the isolating ring configured to engage each other to form a gas seal to prevent a gas from exiting the contact gap into the compression volume when the blast cylinder and the tubular guide are moved to the closed position.

An arc extinguishing contact assembly for a circuit breaker assembly is provided. The arc extinguishing contact assembly includes a fixed contact assembly, a movable contact assembly and an arc extinguishing assembly. The fixed contact assembly includes a fixed arc contact assembly, a fixed main contact assembly, and a number of movable, intermediate arc contact assemblies. The movable contact assembly includes a movable arc contact assembly and a movable main contact assembly. The arc extinguishing assembly is structured to extinguish an arc generated as the movable contact assembly moves between an open, first position and a closed, second position.

The disclosure relates to a circuit-breaker for high-voltage applications including at least one making and breaking unit having a first contact and a second contact for forming an electrically conductive connection in a connection region, wherein the first contact has an outlet arranged distant to the connection region for insulating gas passing the connection region and through the first contact and wherein the first contact is movable along an axially extending switching axis of the circuit-breaker over a moving distance between a closed position where the electrically conductive connection is formed and an open position where the electrically conductive connection is separated; a gas compression cylinder that is motion-coupled to the first contact and which defines a cylinder volume for the insulating gas, wherein the cylinder volume is variable by means of a piston sliding in the gas compression cylinder when moving the first contact.