Page 31 - B_ELSB_Cat_2022_01_MCBs

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MCBs technical details
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Limitation of specific let-through energy I t

S800 S characteristics B, C, D and K
400 V let-through energy

200 A
125 A
10 5 80 A
160 A
50 A
Sine-shaped half-wave 100 A 125 A 20 A
32 A
13 A
Let-through energy I 2 t [A 2 s] 10 4 63 A 80 A 2

1

400 VAC/50 Hz
60˚

2 10 50
Prospective short-circuit current I [kA]
cc

200 A
100 A
10 5 63 A
160 A
40 A
Sine-shaped half-wave 100 A 125 A 16 A
25 A
Let-through energy I 2 t [A 2 s] 10 4 63 A 80 A
10 A

400 VAC/50 Hz
60˚

2 10 50
Prospective short-circuit current I [kA]
cc
 Min. pre-arching I 2 t, e.g. NH80 A gL/gG
 Max. let-through I 2 t, e.g. S803S-C20
Selectivity with respect to the upstream fuse to the point of intersection of both curves 1 and 2, e.g.
S801S-C20 to NH80A gL/gG: Selectivity up to min. 5 kA.