Short-circuit protection at
motor-protective circuit-
breakers
53
06/10 MN03402004Z-DE/EN
Short-circuit protection at
motor-protective circuit-
breakers
The following table 5 shows the short-circuit breaking
capacity of motor-protective circuit-breaker PKE.
To increase the switching capacity to 100 kA, fuses can be
fitted upstream.
Table 5:
Switching capacity of PKE with type “1” and type “2”
coordination
1) Rated uninterrupted current
I
u
2) Rated conditional short-circuit current
I
q
IEC/EN 60 947-4-1
3) Fuse (A gG/gL) for enhancing the switching capacity of the
motor-protective circuit-breaker to 100 kA
N Not necessary
230 V
400 V
440 V
500 V
690 V
I
u
1)
I
q
2)
I
q
2)
I
q
2)
I
q
2)
I
q
2)
[A]
[kA]
[A]
3)
[kA]
[A]
3)
[kA]
[A]
3)
[kA]
[A]
3)
[kA]
[A]
3)
PKE12/XTU(A)-1.2
50
50
50
50
50
50
10
50
3
50
PKE12/XTU(A)-4
50
50
50
50
50
50
10
50
3
50
PKE12/XTU(A)-12
50
50
50
50
20
50
10
50
3
50
PKE32/XTU(A)-12
100
N
100
N
25
50
6
50
3
50
PKE32/XTU(A)-32
100
N
100
N
25
50
6
50
3
50
Summary of Contents for PKE12 Series
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