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2 Engineering
2.3 Short-circuit protection of the motor-protective circuit-breakers
2.3 Short-circuit protection of the motor-protective circuit-breakers
32
The following table 2 shows the short-circuit breaking capacity of the
PKZM0-.../XTPR...BC1NL, PKZM0-...-T/XTPT...BC1NL motor-protective
circuit-breakers.
Fuse can be interconnected in the upstream circuit to increase the switching
capacity to 100 kA.
Table 2: Switching capacity of PKZM0-.../XTPR...BC1NL and PKZM0-...-T/XTPT...BC1NL
with type of coordination "1" and "2"
230 V
1)
2)
I
I
u
q
A
kA
0,16 - 1
150
N
1,6
N
2,5
N
4
N
6,3
N
10
N
12
50
50
16
50
50
20
50
50
25
50
50
32
50
50
No upstream protective device required, as it is the auto-protected range (150 kA)
N = Not required
1) Rated uninterrupted current I
2) Conditional rated short-circuit current I
3) Primary fusing is required if the short-circuit current exceeds the conditional rated short-circuit current (I
The conditional rated short-circuit current is determined by the primary fuse used:
100 A gG/gL, I
= 30 kA
q
50 A gG/gL, I
= 100 kA
q
PKZM0-.../XTPR...BC1NL, PKZM0-...-T/XTPT...BC1NL 01/22 MN03402003Z-DE/EN www.eaton.com
400 V
440 V
2)
2)
I
I
q
q
3)
kA
A
kA
150
N
150
N
N
N
N
N
50
50
50
50
50
50
50
50
50
50
50
50
50
50
50
50
u
according to IEC/EN 60947-4-1
q
500 V
690 V
2)
I
I
q
3)
3)
A
kA
A
kA
N
150
N
150
N
N
N
N
5
N
N
3
N
42
50
3
50
42
50
3
50
15
50
3
50
15
50
3
50
10
50
3
50
10
50
3
50
10
50
3
2)
q
3)
A
N
N
50
50
50
50
50
50
50
50
50
> I
).
cc
q
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