Gas blast switch comprising an optimized gas storage chamber

A gas blast switch, comprising:

• two arcing contacts movable relative to one another along an axis,
• a main nozzle and an auxiliary nozzle both made from insulation-material and extending around the axis such as to delimit an arcing region,
• a gas storage chamber for storing quenching gas, the gas storage chamber being delimited by respective surfaces of radially opposite inner and outer walls and of axially opposite first and second end walls,
• a gas channel extending between an outer surface of the auxiliary nozzle and an inner surface of the main nozzle and connecting the gas storage chamber to the arcing region through an opening in the first end wall, and
• a flow guiding radial wall extending in the gas storage chamber at a distance from each of the inner and outer walls and the first and second end walls,
• wherein the opening of the gas channel through the first end wall faces a first space between the flow guiding radial wall and the inner wall,
• the surface of the outer wall comprises a deflecting portion protruding towards the inside of the gas storage chamber and facing the second end wall, and
• at least part of the deflecting portion is offset from the flow guiding radial wall in a direction parallel to the axis and oriented from the gas channel towards the gas storage chamber.