Installation
50
9229 0025 176 0A
2019-08-05
Use a steel brush to brush contact surfaces of the conductor bars (cross-wise) until
they are bright and wipe them off with a clean cloth.
After cleaning, very lightly grease the bright contact surfaces with acid-free Vaseline
(e.g. Shell-Vaseline 8420) and screw together immediately.
Screw-in depths from contact surface in the upper and lower terminals
Fig. 79
Screw-in depths
Connecting the main conductor
For vacuum circuit-breakers with connection bars, we recommend using the stain-
less steel screws or non-magnetisable stainless steel screws included with the sup-
plementary equipment.
Mounting conductor bars
Adjust the conductor bars in such a way that, before fastening, they lie flat easily and
fit the holes on the contact surfaces of the upper and lower terminal.
Depending on the rated current strength, use M12 or M16 screws and nuts - strength
class 8.8 - and the appropriate spring elements and washers for the connection of
the conductor bars.
Rated voltage
U
r
kV
7.2 - 17.5
24
Rated short-circuit breaking current
I
sc
kA
16 - 31.5
40
16 - 25
16 - 25
Rated normal current
I
r
A 800 - 1600
2000 -
2500
800 - 1250
2000 -
2500
Connection thread
M12
M16
M12
M16
M12
M16
Upper terminal (A)
mm
20 ±1
20 ±1
28 ±1
Lower terminal (B)
mm
20 ±1
28 ±1
38 ±1
28 ±1
44 ±1
Fig. 80
Screw-in depths in the upper and lower termi-
nals
Fig. 81
Mounting the conductor bars (flat). Example
for 1 250 A with drill hole for dowel pin