ABB VD4 - Page 36

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Figure 4/6: Basic structure of the stored-energy spring mechanism
15 Recess
19 Charging lever
20 Vacuum interrupter
20.3 Movable contact
21 Upper breaker terminal
22 Lower breaker terminal
23 Flexible connector
25 Contact force spring
26 Insulated coupling rod
27 Opening spring
28 Shift lever pair
29 Cam disk
30 Drive shaft
31 Release mechanism
32 Stop disk
33 Drum with spiral spring
34 Chain drive
35 Ratchet wheel
36 Left-hand control cam
Figure 4/7: View of the stored-energy spring mechanism and
auxiliary equipment with the front plate removed
15 Recess for charging lever 19
31 Release and control mechanism on the drive shaft
33 Drum with spiral spring
34 Chain drive
35 Ratchet wheel
37 Charging motor
38 Release and control mechanism area
39 Auxiliary switch block
Figure 4/5: Partial section of a vacuum interrupter,
simplified schematic diagram
(Details vary according to the specified switching duties)
20.1 Insulator
20.2 Fixed contact
20.3 Movable contact
20.4 Metal bellows
20.5 Screen
20.6 Guide
20.7 Interrupter lid
Figure 4/4: Circuit-breaker front with controls and annunciations
9.1 Mechanism enclosure
9.2 Front plate
11 ON push-button
12 OFF push-button
13 Mechanical position indicator
14 Mechanical operating cycle counter
15 Recess for charging lever 19
17 Rating plate
18 Mechanical charging condition indicator
20.1
20.2
20.3
20.4
20.5
20.7
20.6
9.1
9.2
11
12
14
13
15
18
17
38
31
39
15
35
33
34
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