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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

1.1

1.07

0.8 x I

Installed in the section from the bottom to the top, descending from size 3 to size

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

1.04

1.00

0.95

0.9

of the fuse

0.85

0.8