Patent ID: 7772958

Claim:
A circuit breaker comprising: a first contact sleeve, a second contact sleeve, an insulating sleeve disposed between the first contact sleeve and the second contact sleeve, a switching piston with at least one contact section and an isolating section, which is disposed at a side of the contact section, wherein the switching piston is movable in the first contact sleeve, the second contact sleeve and the insulating sleeve between a closed position in which the contact section of the switching piston connects the first contact sleeve with the second contact sleeve so as to be electrically conductive, and an open position in which the contact section of the switching piston- does not connect the first contact sleeve with the second contact sleeve, wherein the contact section has contact areas that establish an electrically conductive contact with the first contact sleeve and/or the second contact sleeve, wherein the contact section has a metal sleeve into which is inserted a split piston of elastic material with split rings-and that the contact areas are ring-shaped spread out areas of the metal sleeve formed by the split rings, wherein the isolating section is elastically deformable and in the insulating sleeve exerts a surface pressure force on a surface thereof due to elastic deformation, wherein the first contact sleeve is sealed by means of a flange in which is inserted at least one propellant charge that generates gas; and wherein there is a plurality of propellant charges inserted in recesses of the flange and the recesses of the flange are sealed with plugs.