Siemens 3AH37 Operating Instructions Manual page 20

Description
Pole assembly
Fig. 23 Pole assembly (I)
20
The pole assembly (19.) of the 3AH37/38 vacuum circuit-breaker consists of
• the upper interrupter support (20.)
• with the upper terminal (27.)
• of 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 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 vacuum interrupters
A slight change in the contact stroke that occurs over the entire useful life of the
vacuum circuit-breaker has no effect on its function. There is no need for a status
indicator for the contact system.
Fig. 24 Pole assembly (II or III)
29.1
29.2
30.
40.
48.6
Flexible connector
Clamp
Vacuum interrupter
Lower interrupter support
Angle lever
9229 9992 176 0D
2013-07-08