Technical data
51
Protective Devices
1)
Selectivity limit current I
s
under 0.5 kA
2)
Selectivity limit current I
s
= rated breaking capacity I
cn
of the
RCD/MCB device
Darker areas: no selectivity
Short Circuit Selectivity CKN4-../1N/ towards NH-00
In case of short circuit, there is selectivity between the combined RCD/MCB devices CKN4../1N/ and the upstream fuses up to the specified values of the selec-
tivity limit current I
s
[kA] (i. e. in case of short-circuit currents I
ks
under I
s
, only the MCB will trip, in case of short circuit currents above this value both protec-
tive devices will respond).
*) basically in accordance with EN 60898-1 D.5.2.b
Short circuit selectivity characteristic B towards fuse link NH-00*)
CKN4
NH-00 gL/gG
I
n
[A]162025323540506380100125160
2 0.5 0.8 1.5 3.1 4.5
2)
4.5
2)
4.5
2)
4.5
2)
4.5
2)
4.5
2)
4.5
2)
4.5
2)
4 <0.5
1)
<0.5
1)
0.5 0.9 1.7 2.6 4.5
2)
4.5
2)
4.5
2)
4.5
2)
4.5
2)
4.5
2)
6 <0.5
1)
<0.5
1)
0.5 0.8 1.3 1.8 3.1 4.5
2)
4.5
2)
4.5
2)
4.5
2)
4.5
2)
10 <0.5
1)
0.5 0.8 1.2 1.8 2.5 3.9 4.5
2)
4.5
2)
4.5
2)
4.5
2)
13 <0.5
1)
0.5 0.8 1.2 1.6 2.4 3.6 4.5
2)
4.5
2)
4.5
2)
4.5
2)
16 0.5 0.8 1.2 1.6 2.4 3.3 4.5
2)
4.5
2)
4.5
2)
4.5
2)
20 0.8 1.1 1.4 2.1 3.1 4.2 4.5
2)
4.5
2)
4.5
2)
25 0.7 1.0 1.4 1.9 2.7 3.8 4.5
2)
4.5
2)
4.5
2)
32 1.8 2.5 3.4 4.5
2)
4.5
2)
4.5
2)
40 2.3 3.2 4.5
2)
4.5
2)
4.5
2)
Short circuit selectivity characteristic C towards fuse link NH-00*)
CKN4
NH-00 gL/gG
I
n
[A] 16 20 25 32 35 40 50 63 80 100 125 160
2 0.5 0.6 0.8 2.2 4.5
2)
4.5
2)
4.5
2)
4.5
2)
4.5
2)
4.5
2)
4.5
2)
4.5
2)
4 <0.5
1)
<0.5
1)
0.5 1.0 1.6 2.8 4.5
2)
4.5
2)
4.5
2)
4.5
2)
4.5
2)
4.5
2)
6 <0.5
1)
<0.5
1)
0.5 0.8 1.2 1.7 3.0 4.5
2)
4.5
2)
4.5
2)
4.5
2)
4.5
2)
10 <0.5
1)
0.7 1.0 1.3 2.0 3.0 4.5
2)
4.5
2)
4.5
2)
4.5
2)
13 0.9 1.2 1.8 2.6 4.0 4.5
2)
4.5
2)
4.5
2)
16 0.8 1.1 1.6 2.4 3.5 4.5
2)
4.5
2)
4.5
2)
20 0.8 1.1 1.5 2.3 3.3 4.5
2)
4.5
2)
4.5
2)
25 1.4 2.1 3.0 4.5
2)
4.5
2)
4.5
2)
32 1.9 2.7 4.5
2)
4.5
2)
4.5
2)
40 2.6 4.5
2)
4.5
2)
4.5
2)
Let-through Energy CKN4-../1N/
Let-through energy CKN4, characteristic B, 1+N-pole
Let-through energy CKN4, characteristic C, 1+N-pole
Prospective short-circuit current [A]
Let through energy I
2
t [A
2
sec]
Prospective short-circuit current [A]
Let through energy I
2
t [A
2
sec]