Page 227 - B_ELSB_Cat_2022_01_MCBs

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MCBs technical details
S800-SCL-SR range features

Internal resistance at 25 °C ambient temperature and nominal power losses
Rated operational current I Internal resistance R Power losses P
e i Vn
[A] [mΩ] [W]
32 2.8 3.6
63 1.3 5.7
100 0.7 7.8

Influence of ambient temperature – single mounted devices
Rated operational 10 °C 15 °C 20 °C 25 °C 30 °C 35 °C 40 °C 45 °C 50 °C 55 °C 60 °C 65 °C 70 °C
current I [A]
e
32 38.2 37.2 35.8 35.2 34.2 33.3 32 30.7 29.8 28.8 27.8 26.5 25.1
63 75.3 73.2 70.6 69.3 67.4 65.5 63 60.5 58.6 56.7 54.8 52.3 49.8
100 119.5 116.2 112 110 107 104 100 96 93 90 87 84 80

Installation requirements
The total sum of the rated currents of all downstream motor starters or circuit breakers shall not exceed the rated current
of the S800-SCL-SR (valid also for HV version). Furthermore the sum of all load currents including inrush currents shall not
exceed the maximum permissible load of the S800-SCL-SR (valid also for HV version).

Maximum load

10000
Example:
If you have 8 manual motor starters with each 5A as
rated operational current
Sum: 8 x 5A = 40A
1000 Then you have to use either the 63A or 100A S803-SCL-SR.
In this example we use the 63A version.
We know that our maximum load is 245A. Thus we have
to calculate if this maximum load can be handled with
the 63A version and, if yes, for how many seconds.
100 245A / 63A = 3.89 ~ 4
So now you can check where the multiplier „4“ crosses
the graph of the 63A version to know for how many
seconds this load can be handled. In this example
time [s] 10 a load of 245 A can be handled for max. 50 seconds.
Please note: always use the S800-SCL-SR in the left
Time in s area of this graphic, since it would be damaged
otherwise.

1

8 x Ie 12 x Ie
0.1

0.01
1 10 100
n x Ie
Multiple of the rated current Ie