A switching device for an encapsulated electric power distribution switchgear comprising a switch, an electrically conductive housing to which the switch is mounted, and which housing comprises an opening that leads into the housing, wherein the switch comprises a first electric contact assembly electrically connected to a first electric conductor and a second electric contact assembly electrically connected to a second electric conductor, the second electric contact assembly being movable in relation to the first electric contact assembly and in relation to the housing, the switching device further comprising an insulated operating shaft of electrically insulating material for operating the switch and having a longitudinal axis Y and being rotatable about its longitudinal axis Y in relation to the housing, and of which a part is inserted into the housing via the opening, an actuator member located inside the housing and having a first end coupled to the operating shaft and a second end coupled to the second electric contact assembly, wherein, by rotation of the operating shaft coupled to the actuator member, the second electric contact assembly is movable between a first closed position of the switch and a second open position of the switch, in which closed position the second contact assembly is in contact with the first electric contact assembly and in which open position the second contact assembly is not in contact with the first electric contact assembly, characterized in that - the actuator member is made of an electrically insulating material, - the operating shaft extends through the opening and into the housing without directly contacting the housing at the opening, - the operating shaft is supported in the housing by the actuator member, - the actuator member is movably supported in the housing at a connection area that is located within the housing and which connection area forms an interface between the actuator member and the housing, and that - the interface is located at a first distance D from the longitudinal axis Y of the operating shaft that is longer than a second distance d between the longitudinal axis Y of the operating shaft and a circumferential edge that delimits the opening in the housing, which first and second distances are measured in the same radial direction in relation to the longitudinal axis Y. a switch, an electrically conductive housing to which the switch is mounted, and which housing comprises an opening that leads into the housing, an insulated operating shaft of electrically insulating material for operating the switch and having a longitudinal axis Y and being rotatable about its longitudinal axis Y in relation to the housing, and of which a part is inserted into the housing via the opening, an actuator member located inside the housing and having a first end coupled to the operating shaft and a second end coupled to the second electric contact assembly, - the actuator member is made of an electrically insulating material, - the operating shaft extends through the opening and into the housing without directly contacting the housing at the opening, - the operating shaft is supported in the housing by the actuator member, - the actuator member is movably supported in the housing at a connection area that is located within the housing and which connection area forms an interface between the actuator member and the housing, and that - the interface is located at a first distance D from the longitudinal axis Y of the operating shaft that is longer than a second distance d between the longitudinal axis Y of the operating shaft and a circumferential edge that delimits the opening in the housing, which first and second distances are measured in the same radial direction in relation to the longitudinal axis Y.