Short-Circuit Breaking Capacity For Motor Starter Protectors In The It System - Siemens SIRIUS 3RT Series System Manual

SIRIUS 3RV2 motor starter protectors
4.10 Technical data
4.10.11.2

Short-circuit breaking capacity for motor starter protectors in the IT system

Short-circuit breaking capacity I
3RV2 motor starter protectors are suitable for use in IT systems. The values of I
apply for the three-pole short circuit. In the case of a double ground fault in different phases
(input and output side of a motor starter protector), the special short-circuit breaking capacity
I
cuIT
protectors.
In some ranges I
are short-circuit-proof in this range.
If the short-circuit current at the installation location exceeds the motor starter protector's
specified rated service short-circuit breaking capacity, you will need to use a backup fuse.
The maximum rated current of this backup fuse is indicated in the tables. The rated short-
circuit breaking capacity then applies as specified on the fuse.
Table 4- 34 Short-circuit breaking capacity I
Rated current I Up to 240 V AC
n
I
cuIT
A kA
Size S00
0.16 ... 0.4 100
0.5 100
0.63 100
0.8 100
1 100
1.25 100
1.6 100
2 100
2.5 100
3.2 100
4 100
5 100
6.3 100
8 100
10 100
12.5 100
16 55
464
in the IT system
cuIT
applies. The specifications listed in the table below apply for 3RV2 motor starter
is 100 kA and 50 kA respectively. As such the motor starter protectors
cuIT
in the IT system part 1
cuIT
Max. fuse (gL/gG)
A
1)
1)
1)
1)
1)
1)
1)
1)
1)
1)
1)
1)
1)
1).
1)
1)
80
Up to 400 V
I
4)
cuIT
kA
100
100
100
100
100
100
100
8
8
8
4
4
4
4
4
4
4
/415 V AC
2) 3)
Max. fuse (gL/gG)
4), 5)
A
1)
1)
1)
1)
1)
1)
1)
25
25
32
32
32
50
50
50
63
63
SIRIUS Innovations
System Manual, 01/2011, A8E56203870002-03
and I
cu cs