Siemens 3AH37, Operating Instructions Manual, Page: 20 / 64

Description
20 9229 9992 176 0D
2013-07-08
Pole assembly 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.
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. 23 Pole assembly (I) Fig. 24 Pole assembly (II or III)
19. Pole assembly 29.1 Flexible connector
20. Upper interrupter support 29.2 Clamp
27. Upper terminal 30. Vacuum interrupter
28. Strut 40. Lower interrupter support
28.1 Centering 48.6 Angle lever
29. Lower terminal