18
3 Description
Parallel to the main circuit is the arcing circuit, which is made up of the movable pin 22.9 in the contact carrier
22.31 and the moving tube contact 22.11 situated in the heating cylinder 22.41.
The pin 22.9 and the tube contact 22.11 are made of materials which produce only minimal contact erosion.
The tube contact 22.11, the piston 22.11.17 and the heat cylinder 22.41 are mechanically interconnected and
coupled with the pull rod 22.17.1. They form the moving part of the interrupter unit.
A guide rail 22.5 is mounted at the nozzle 22.11.1. This engages with the control lever 22.46 via the pin 22.52. As
a result, the control lever is subjected to rotary movement, causing linear movement of the pin against the
direction of movement of the nozzle. The electrode 22.45 is connected to the nozzle via the gears using two
connecting rods and provides the pin with dielectric shielding.
The rear side of the piston 22.11.17 is equipped with a valve plate 22.11.18 which together with the valve group
22.11.19 makes up the compression unit for arc quenching.
The breaking process in the interrupter unit is described in a schematic diagram in the section 3.5
Arc Quenching.
