Page 193 - B_ELSB_Cat_2022_01_MCBs

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MCBs technical details
MCBs internal resistance, power loss and
max. permissible earth-fault loop impedance

S 200 P
Rated B C D K Z
current I A
n max. ZS max. ZS max. ZS max. ZS max. ZS
q q q q q
0.2 - - - 39.5 -
0.3 - - - 34.8 -
0.5 - 46.0 27.4 26.5 143.0
0.75 - - - 19.4 -
1 - 23 15 15 74.4
1.6 - 14.4 9.6 9.6 47.9
2 - 11.5 7.8 7.8 38.3
3 - 7.7 11.8 5.3 25.3
4 - 5.8 8.8 3.9 19.1
6 7.6 3.8 5.9 2.6 12.7
8 - 2.8 5.7 2.0 9.5
10 4.6 2.3 3.5 1.6 7.6
13 3.5 1.7 2.7 - -
16 2.9 1.4 2.2 1.0 4.7
20 2.3 1.1 1.7 0.8 3.8
25 1.8 0.9 1.4 0.6 3.0
32 1.4 0.7 1.1 0.5 2.4
40 1.1 0.6 0.9 0.4 1.9
50 0.9 0.5 0.7 0.3 1.5
63 0.7 0.4 0.6 0.25 1.1

S 300 P
Rated B C D K Z
current I A
n max. ZS max. ZS max. ZS max. ZS max. ZS
q q q q q
0.2 - - 41.2 -
0.3 - - - 36.3 -
0.5 - 46.0 27.4 27.7 143.0
0.75 - - - 20.2 -
1 - 24.0 15.7 15.7 77.6
1,6 - 15.0 10.0 10.0 50.0
2 - 12.0 8.1 8.1 40.0
3 - 8.0 12.3 5.5 26.4
4 - 6.1 9.2 4.1 19.9
6 7.9 4.0 6.2 2.7 13.3
8 - 2.9 5.9 2.1 9.9
10 4.8 2.4 3.7 1.7 7.9
13 3.7 1.8 2.8 - -
16 3.0 1.5 2.3 1.0 4.9
20 2.4 1.1 1.8 0.8 4.0
25 1.9 0.9 1.5 0.6 3.1
32 1.5 0.7 1.1 0.5 2.5
40 1.1 0.6 0.9 0.4 2.0
50 0.9 0.5 0.7 0.3 1.6
63 0.7 0.4 0.6 0.3 1.1

b U0 = rated voltage against earthed conductor; for U0 = 240 V~ is ZS · 1.04; for U0 = 127 V~ is ZS · 0.55
Take into account the voltage drop:
e.g. in the case of a 1.5 mm 2 conductor, protected by a B 16 circuit-breaker, the maximum cable length is 82 m. If the voltage drop is below 3%, this would result in a maximum cable
length (2-strand) of 17 m. For more details on this topic, get your own copy of the technical information leaflet “Maximum cable lengths”.

Maximum cable lengths in the case of different voltages and cross sections on request.