95
1. Withdrawable assembly:
• Disconnect plug connector 10.3 (figure 148);
• Remove interlock rod 13.91 with pin 13.27 from the withdrawable assembly;
• For motor-operated withdrawable assemblies, remove the two socket head bolts (M4), which are
accessible from below the assembly;
• Remove the circuit-breaker from the withdrawable assembly (4 x M12 bolts);
• Mount the circuit-breaker on a new withdrawable assembly in the reverse order, using new circlips
and special pliers for pin 13.27;
• Check the setting of interlocking rod 13.91;
- Turn spindle 18 anti-clockwise to the stop for the disconnected position:
- The distance between lever 13.26 and cam 13.25 must be 2w1 mm;
- The distance between roller 13.24 and angle lever 13.92 must be 0.5 mm;
- Turn spindle 18 clockwise to the stop for the service position:
- The distance between lever 13.26 and cam 13.25 must be 2w1 mm;
- The distance between roller 13.24 and angle lever 13.92 must be 0.5 mm;
- Loosen bolts 13.91.2 or 13.92.1 for any necessary adjustment.
Figure 148 Detail of the withdrawable part of VD4 circuit-breaker with motor operator, seen from the left-hand side.
13.24 Roller
13.25 Plastic cam
13.26 Lever
13.27 Pin
13.90 Motor operator
13.91 Tie-rod
13.91.1 Bolt
13.91.2 Bolt
13.92 Angular lever
13.92.1 Bolt
13.91
13.27
13.91.1
13.92.1
13.90
3.25
3.26
3.24
3.92
max. 0.5
13.91.2
7.4.2 Replacement of complex functional groups
Precise matching of functions for control, interlocking and signalling only permits replacement of
individual components to a limited extent.
The following assemblies are prefabricated and tested at the works, maintaining high quality
standards. In the case of faults, they must therefore be completely replaced.
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