11
45.2
45.1
45.3
Figure 7: Push button for mechanical ON/OFF breaker
operation with the door closed (on request).
If the withdrawable part is in the service
position, operation is carried out using the
knob which swings a push rod extension out.
45.1 Mechanical pushbutton
45.2 Turning knob
Figure 8: View of the push rod extension swung out by
the knob at the front, with the withdrawable
circuit-breaker part in service position and the
door open
45.3 Swivelling push rod
3.3.3 Withdrawable parts (Figure 2)
1. Withdrawable circuit-breaker parts
The withdrawable circuit-breaker forms a complete module consisting of the vacuum circuit-
breakers type VD4, Vmax or VM1, SF6 circuit-breaker type HD4, the withdrawable assembly 13.15
(figure 9), isolated contact arm 4.2 with contact system 4.3 and control wiring plug 10.2.
The withdrawable assembly 13.15 and the circuit-breaker are coupled via a multi-pole control
wiring plug connector 10.3 (figure 10).
The withdrawable assembly establishes the mechanical connection between the panel and the
circuit-breaker. The fixed part is connected to the panel by forking, which is form coded on both
sides. The moving part with the circuit-breaker is moved manually or by a motor by means of a
spindle, between the service or test/disconnected positions with the front doors closed.
Service and test disconnected positions are set precisely by means of auxiliary switches, which
register the final position reached and the angular position of the spindle.
The earthing connection between the withdrawable part and the panel is established by its rollers
and travel rails 42 (figure 4), which are bolted onto the panel.
Withdrawable parts of the same design are interchangeable. In the case where the withdrawable
parts have the same dimensions, but different circuit-breaker fittings, the control wiring plug coding
prevents any erroneous connections between the withdrawable part and the panel.
The coding is indicated in the order documents (figure 23).
2. Withdrawable contactor parts (Figures 2, 11, 12)
In place of the circuit-breaker type, the withdrawable part can also be fitted with the V-Contact VSC
type vacuum contactor.
V-Contact VSC is fitted with MV fuses 91.15 and can be used for rated voltage up to 12 kV.
All the data mentioned in this chapter for circuit-breakers also apply to the contactors.
3. Other withdrawable parts
The withdrawable part can also be fitted with the following trucks:
• metering voltage transformer truck with fuses;
• earthing truck without making capacity (for main busbar system and power cables);
• earthing truck with making capacity (for main busbar system and power cables);
• power cable testing truck;
• isolation truck;
• isolation truck with fuses;
• shutter lifting truck.
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