High voltage circuit-breaker

A circuit-breaker for high-voltage applications comprising:

• at least one making and breaking unit having a hollow first contact and a second contact in the shape of a pin to be plugged into the first contact for forming an electrically conductive connection in a connection region, wherein at least one of the contacts is movable along an axially extending switching axis of the circuit-breaker between a closed position where the electrically conductive connection is formed and an open position where the electrically conductive connection is separated;
• and
• a first contact housing having a guiding passage surrounding and forming with the first contact a circumferential gap, which first contact housing has at least one recess surrounding the first contact, which at least one recess is open towards the first contact by means of a recess opening facing the first contact for trapping particles carried by an insulating gas coming from the connection region and passing the circumferential gap;
• wherein
• an extension of the recess opening is shorter than an extension of the at least one recess and/or two or more of said at least one recesses are arranged axially adjacent to one another;
• and
• the first contact and the first contact housing are movable relative to one another in order to in the open position radially substantially close the recess opening and form the circumferential gap on both sides axially adjacent to the recess opening.