ABB VD4 Installation And Service Instructions Manual page 7

D I S T R I B U T I O N S O L U T I O N S
2 3
5
9
1 1.1 8 7
Figure 4/1: Circuit breaker front with controls and annunciations
1 Mechanism enclosure
1.1 Front plate
2 ON push-button
3 OFF push-button
4 Position indicator
5 Operating cycle counter
6 Recess for charging lever 9
7 Rating plate
8 Charging condition indicator
9 Charging lever
13
12
15
16.2
14
17
18
19
20
Figure 4/2: Sectional view of a vacuum circuit breaker,
type VD4, schematic diagram
1 Mechanism enclosure
1.1 Front plate, removable
12 Insulating material pole tube
13 Upper breaker terminal
14 Lower breaker terminal
15 Vacuum interrupter
16.2 Roller contact
17 Contact force spring
18 Insulated coupling rod
19 Opening spring
20 Shift lever pair
4
6
1 1.1
15.1
15.2
15.3
15.5
15.4
15.6
15.7
Figure 4/3: Partial section of a vacuum interrupter, simplified
schematic diagram (Details vary according
to the specified switching duties)
15.1 Insulator
15.2 Fixed contact
15.3 Movable contact
15.4 Metal bellows
15.5 Screen
15.6 Guide
15.7 Interrupter lid
15
15.3
15.2
17
18
19
30
21
20
Figure 4/4: Basic structure of the stored-energy spring mechanism
6 Recess
9 Charging lever
15 Vacuum interrupter
15.3 Movable contact
16.2 Roller contact
17 Contact force spring
18 Insulated coupling rod
19 Opening spring
20 Shift lever pair
21 Cam disk
30 Drive shaft
31 Release mechanism
32 Stop disk
33 Drum with spiral spring
34 Chain drive
35 Ratchet wheel
50 Left-hand control cam
7
35
9
6
34
33
33
32
50