High-voltage power breaker having an outlet flow channel

A method of designing a high-voltage power breaker comprising:

• providing two arcing contact pieces which are separated from one another when disconnected and between which an arc is struck in an arcing area filled with a quenching gas which has been heated by the arc;
• providing an insulating nozzle surrounding the arcing area, the insulating nozzle including a constriction point from which the quenching gas flows in an outlet flow direction through at least one outlet flow channel having a number of areas which the quenching gas passes through successively, wherein
• a first area faces the constriction point of the nozzle and has a specific flow resistance which is less than that of the constriction point,
• the first area in the outlet flow direction of the quenching gas is followed by at least a second area, a third area and a fourth area, in which a specific flow resistance of the second area and of the fourth area, respectively, is greater than a specific flow resistance of an immediately preceding area in the outlet flow direction, and
• the specific flow resistance of the third area is less than that of the second area.