Siemens 3AH3 Operating Instructions Manual page 48

Mounting
Fig. 68 Installing busbars flat
48
Note
For vacuum circuit-breakers with connecting bars, it is recommended to use the
stainless steel screws or non-magnetisable screws included in the accessory
pack.
Corresponding to the rated current strength, use M12 screws and nuts – strength
class 8.8 – for connection of the busbars and use the appropriate spring elements
and washers.
When tightening the screws, hold the nuts against tightening torque of 70 Nm with
a suitable screwdriver or socket wrench.
Screw-in depths in the upper and lower terminals
See dimension drawings.
Fig. 69 Installing busbars flat
9229 9860 176 0E
2013-08-22