Siemens 3AH4, Operating Instructions Manual

Page: 17 / 66

Description
9229 9862 176 0D 17
2013-08-28
Description
Design
Vacuum circuit-breaker The 3AH4 vacuum circuit-breaker consists of
•
the mechanism box (60.),
• the 3 pole assemblies (19.) with vacuum interrupters (30.),
• the cast resin post insulators (16.1 and 16.2) with reinforcing struts (28.) and
• the insulating operating rods (48.) with contact pressure springs (49.) required
for contact actuation.
Each of the 3 pole assemblies (19.) is carried by the cast resin post insulators (16.1
and 16.2) that are screwed to the pole plate (15.).
Fig. 18 Side view
15. Pole plate
16.1 Upper post insulator
16.2 Lower post insulator
19. Pole assembly, complete
28. Strut
30. Interrupter
48. Insulating operating rods
49. Contact pressure spring
60. Mechanism box