Siemens 3AH3 Operating Instructions Manual page 20

Description
Pole assembly
Fig. 23 Pole assembly (I)
20
The pole assembly (19.) of the 3AH3 vacuum circuit-breaker consists of
• the upper interrupter support (20.)
• with the upper terminal (27.)
• the vacuum interrupter (30.),
• the lower interrupter support (40.) with the lower terminal (29.) and the clamp
(29.2) with flexible connector (29.1);
• as well as the angle lever (48.6.).
The centering (28.1) and the struts (28.) relieve the vacuum interrupters of external
forces.
19. Pole assembly
20. Upper interrupter support
27. Upper terminal
28. Strut
28.1 Centering
29. Lower terminal
Contact system in the interrupters
A slight change in the contact stroke that occurs over the entire useful life of the
interrupter has no effect on the function of the vacuum circuit-breaker. There is no
need for a status indicator for the contact system.
Fig. 24 Pole assembly (II and III)
29.1
29.2
30.
40.
48.6
Flexible connector
Clamp
Interrupter
Lower interrupter support
Angle lever
9229 9860 176 0E
2013-08-22