Siemens 3AK Operating Instructions Manual page 14

Description
Pole assembly
15. Pole plate
20. Upper interrupter support
21. Break contact
23. Pole column
26. Earth terminal
27. Upper terminal
29. Lower terminal
30. Interrupter
40. Lower interrupter support
14
The pole assembly of the 3AK vacuum circuit-breaker module consists of
• the upper interrupter support (20.),
• with the upper terminal (27.) and the break contact (21.),
• the vacuum interrupter (30.),
• the lower interrupter support (40.) with the lower terminal (29.) and the break
contact (21.).
Each of the 3 pole assemblies is supported by the pole columns (23.), which are
screwed to the pole plate (15.).
Fig. 8 Pole side
Contact system in the vacuum interrupters
A slight change in the contact stroke that occurs over the entire useful life of the vac-
uum interrupter has no effect on its function. There is no need for a status indicator
for the contact system.
48. Insulating operating rod
68.7 Automatically coupling low-voltage plug
80. Withdrawable part
84. Mounting rail
87. Coding
90. Cartridge insert
93. Locking pin
109. Coupling of the earthing switch drive
9229 9923 176 0B
2013-09-09