Installation
9229 0025 176 0E
55
2021-11-15
A drill hole Ø 4H11 must be provided in the conductor bar (see Fig. 83, horizontal
arrow).
See dimension drawings.
*
)
X = Length of the spring pin, depending on the cross-section of the conductor bar in mm
Contact arms and systems
Two versions of contacts (contact arms and systems) are available for SION
®
vac-
uum circuit-breakers, each designed for different types of switchgear:
• Siemens contacts
• Third-party contacts
The two versions differ in terms of their construction and assembly, so that a distinc-
tion is made between the two versions below where it is technically relevant.
Mounting Siemens contacts
• Grease the screw-in section of the threaded rods (22.1) with Vaseline (see 1.).
• Screw in the threaded rod (22.1) and observe the screw-in depths A+B (see 2.)
(see Table “Screw-in depths for screws or threaded rods from the contact sur-
face in the upper and lower connection”, page 54).
• Tighten the threaded rods (22.1) on the contact surfaces of the upper and lower
connections (see 3.)
• Tightening torques for greased threads:
- M12: 40 ±4 Nm
- M16: 100 ±10 Nm
Fig. 84
Cleaning and mounting threaded rods (22.1)
for contact arms (22)
Fig. 85
Cleaning and mounting contact arms (22)
0025-68
22.1
A
B
1.
2.
0025-69
22.1
22
4.
3.
• Contact surfaces,
Copper,
silver-plated
- roughen
x
–
- clean,
x
x
- grease with Vaseline (see 4.)
x
x
