Patent ID: 7619177

Claim:
An interrupter unit for an electrical switching apparatus for power supply systems, the switching apparatus comprising a central axis and at least one first contact part with an insulating nozzle for blowing an arc and a second contact part and at least one of the contact parts being moveable by a switch drive, a holding device for connecting a first side of the insulating nozzle to a component part, which can move by the switch drive, of the interrupter unit being provided, wherein, the holding device produces a mechanical connection between the insulating nozzle and the component part by a clamping hold, the holding device comprises a holding ring, which is supported on the component part and which ensures fixing of the insulating nozzle with an alignment coaxially with respect to the central axis, and the holding ring fixes the insulating nozzle in the axial direction by clamping and has a restraining face for securing the insulating nozzle against sliding out in a first axial direction, wherein a) the component part is a buffer cylinder with a buffer cylinder wall, which has an internal groove, and b) the holding ring is a spring-securing ring, which fixes the insulating nozzle to the buffer cylinder by engaging in the internal groove and by protruding radially inwards from the internal groove and transfers a switch drive force acting in the axial direction from the buffer cylinder to the insulating nozzle, wherein c) the holding device and/or the insulating nozzle can rotate during fitting in relation to the component part about the central axis.