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6.2. Structure of the circuit-breaker poles
The poles are installed in the rear part of the circuit-breaker frame (fig. 7).
The active parts of the poles (vacuum interrupters) are embedded in epoxy resin and protected
against shocks and other external agents.
With the circuit-breaker closed, the current flows from the top terminal (1) to the fixed contact (1a)
in the vacuum interrupter (4), and then through the moving contact (2a) and the flexible connector
(6) as far as the bottom terminal of the circuit-breaker (2).
The movement of the moving contact are ensured by the insulating tie-rod (8) and by the kinemat-
ics (9).
1
2
5
6
7
8
1 Top terminal
1a Fixed contact
2 Bottom terminal
2a Moving contact
3 Pole in resin
4 Vacuum interrupter
5 Current sensor
6 Flexible connector
7 Contact pressure spring
8 Insulating tie-rod
Fig. 7
3
1a
4
2a
9 Drive shaft
10 Run regulator
11 Position sensors
12 Closing coil
13 Permanent magnets
14 Moving armature
15 Opening coil
16 Device for manual emergency opening
17 Supporting structure
17
16
15
14
13
12
11
10
9
11
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