
Miniature Circuit Breaker S 200 M UC | 1SXU400144L0201 5
Miniature Circuit Breaker S 200 M UC
Derating
For installations of miniature circuit breakers at temperatures other than the referenced value and installations of several
miniature circuit breakers directly side by side, derating factors must be considered.
Deviating ambient temperature
The rated value of the current of a miniature circuit breaker refers to a temperature of 20 °C for circuit-breakers with characteristics
K and Z and 30 °C for characteristics B and C. The following table contains the derating of load capability of S 200 M UC MCBs
with temperatures from -40 °C to 70 °C for the curves B, C, K, and Z.
Tripping Rated Maximum operating current at ambient temperature T
characteristics current
In°C
A - 40 - 30 - 20 - 10 0 10 20 30 40 50 60 70
B, C 0.5 0.61 0.59 0.58 0.56 0.55 0.53 0.52 0.50 0.49 0.47 0.46 0.44
1.0 1.21 1.18 1.15 1.12 1.09 1.06 1.03 1.00 0.97 0.94 0.91 0.88
1.6 1.94 1.89 1.84 1.79 1.74 1.70 1.65 1.60 1.55 1.50 1.46 1.41
2.0 2.42 2.36 2.30 2.24 2.18 2.12 2.06 2.00 1.94 1.88 1.82 1.76
3.0 3.63 3.54 3.45 3.36 3.27 3.18 3.09 3.00 2.91 2.82 2.73 2.64
4.0 4.84 4.72 4.60 4.48 4.36 4.24 4.12 4.00 3.88 3.76 3.64 3.52
6.0 7.26 7.08 6.90 6.72 6.54 6.36 6.18 6.00 5.82 5.64 5.46 5.28
8.0 9.68 9.44 9.20 8.96 8.72 8.48 8.24 8.00 7.76 7.52 7.28 7.04
10.0 12.10 11.80 11.50 11.20 10.90 10.60 10.30 10.00 9.70 9.40 9.10 8.80
13.0 15.70 15.30 15.00 14.60 14.20 13.80 13.40 13.00 12.60 12.20 11.80 11.40
16.0 19.40 18.90 18.40 17.90 17.40 17.00 16.50 16.00 15.50 15.00 14.60 14.10
20.0 24.20 23.60 23.00 22.40 21.80 21.20 20.60 20.00 19.40 18.80 18.20 17.60
25.0 30.30 29.50 28.80 28.00 27.30 26.50 25.80 25.00 24.30 23.50 22.80 22.00
32.0 38.70 37.80 36.80 35.80 34.90 33.90 33.00 32.00 31.00 30.10 29.10 28.20
40.0 48.40 47.20 46.00 44.80 43.60 42.40 41.20 40.00 38.80 37.60 36.40 35.20
50.0 60.50 59.00 57.50 56.00 54.50 53.00 51.50 50.00 48.50 47.00 45.50 44.00
63.0 76.20 74.30 72.50 70.60 68.70 66.80 64.90 63.00 61.10 59.20 57.30 55.40
K, Z 0.5 0.59 0.58 0.56 0.55 0.53 0.52 0.50 0.49 0.47 0.46 0.45 0.44
1.0 1.18 1.15 1.12 1.09 1.06 1.03 1.00 0.97 0.94 0.91 0.88 0.85
1.6 1.89 1.84 1.79 1.74 1.7 1.65 1.60 1.55 1.50 1.46 1.42 1.38
2.0 2.36 2.3 2.24 2.18 2.12 2.06 2.00 1.94 1.88 1.82 1.77 1.72
3.0 3.54 3.45 3.36 3.27 3.18 3.09 3.00 2.91 2.82 2.73 2.65 2.57
4.0 4.72 4.60 4.48 4.36 4.24 4.12 4.00 3.88 3.76 3.64 3.53 3.42
6.0 7.08 6.90 6.72 6.54 6.36 6.18 6.00 5.82 5.64 5.46 5.30 5.14
8.0 9.44 9.20 8.96 8.72 8.48 8.24 8.00 7.76 7.52 7.28 7.06 6.85
10.0 11.80 11.50 11.20 10.90 10.60 10.30 10.00 9.70 9.40 9.10 8.83 8.57
13.0 15.30 15.00 14.60 14.20 13.80 13.40 13.00 12.60 12.20 11.80 11.45 11.11
16.0 18.90 18.40 17.90 17.40 17.00 16.50 16.00 15.50 15.00 14.60 14.16 13.74
20.0 23.60 23.00 22.40 21.80 21.20 20.60 20.00 19.40 18.80 18.20 17.65 17.12
25.0 29.50 28.80 28.00 27.30 26.50 25.80 25.00 24.30 23.50 22.80 22.12 21.46
32.0 37.80 36.80 35.80 34.90 33.90 33.00 32.00 31.00 30.10 29.10 28.23 27.38
40.0 47.20 46.00 44.80 43.60 42.40 41.20 40.00 38.80 37.60 36.40 35.31 34.25
50.0 59.00 57.50 56.00 54.50 53.00 51.50 50.00 48.50 47.00 45.50 44.14 42.82
63.0 74.30 72.50 70.60 68.70 66.80 64.90 63.00 61.10 59.20 57.30 55.58 53.91
No. of adjacent devices Factor F
1 1
2, 3 0.9
4, 5 0.8
≥ 6 0.75
Influence of adjacent devices
If several miniature circuit breakers are installed directly side by side
with high load on all poles, a correction factor must be applied to the
rated current (see table). If distance pieces are used, the factor does
not apply.