Siemens SIVACON S8 Operating Instructions Manual page 17

Enclosure:
Configuration notes for in-line fuse switch-disconnectors 3NJ6
Within the scope of the configuration, a blanking cover is automatically positioned at the top of the device compartment, which, however, does not
reduce the effective device compartment of 1750 mm or 1550 mm.
Configuration rule for ventilated sections with plug-in 3NJ6 switch disconnectors:
If these notes are not observed, premature aging of fuses and uncontrolled release may occur as a result of the local overheating. All data refer
to ambient temperatures of the power distribution board of 35 °C as a 24 h average.
Conversion factors for other ambient temperatures:
Ambient temperature of the power
distribution board [°C]
Conversion factor
Method 1: Summation current of all feeders in the section  2000 A
Operating current of the
fuse links:
Disconnector arrangement:
Disconnectors size 3
(group formation not
permissible)
Disconnectors size 2
(group formation not
permissible)
Disconnector groups size
00 and 1
* below the last strap in the section there are 100 mm blanking cover instead of 50 mm resp. instead of 50 mm blanking cover no ones needed
8PQ9800-8AA57
20 25
1.1 1.07
0.8 x I
Installed in the section from the bottom to the top, descending from size 3 to size
00
Permissible current Arrangement of disconnectors and blanking covers
(continuous operating
current at an ambient
temperature of
35 °C)
200 mm = each 100 mm blanking cover
 440 A to 500 A
above and below *
of the individual device
< 440 A 150 mm = each 50 mm blanking cover
of the individual device above and below *
 320 A 50 mm = each 50 mm blanking cover
below *
of the individual device
 400 A 100 mm = each 100mm blanking cover
below * per group
= summation current of
the fuse links group x 0.8
30 35 40 45
1.04 1.00 0.95 0.9
of the fuse
N
50 55
0.85 0.8
A1