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BETA Protecting
Miniature Circuit Breakers
Configuration
1/81
Siemens ET B1 · 10/2008
1
*
You can order this quantity or a multiple thereof.
Personnel safety with miniature circuit breakers
According to DIN VDE 0100-410, in order to protect against
dangerous leakage currents in the TN system, the cross-sections
of the conductor, or its distance from the protective device, must
be dimensioned such that if a fault with negligible impedance
(
i.e. short circuit) occurs at any point between a phase conductor
and a PE conductor, or a connected exposed conductive part,
the device automatically trips within the specified times of 0.4 s
or 5 s.
This requirement is met through the following condition:
Z
s
×
I
a
U
o
Maximum permissible impedance of fault loop at U
o
= 230 V AC for compliance with trip conditions according to DIN VDE 0100-410
Z
s
r
Impedance of the fault loop of all electrical circuits
I
a
r
Current that trips within the specified times
U
o
r
Voltage against ground
I
n
[
A]
Characteristic A Characteristic B Characteristic C Characteristic D
t
a
0.4
s 5 s
t
a
0.4
s 5 s
t
a
0.4
s 5 s
t
a
0.4
s 5 s
5
SY, 5SP
0.3
--
--
--
--
76.6
153
--
--
0.5
--
--
--
--
46
92
--
92
1.0
76.6
76.6
--
--
23
46
15.3
46
1.6
47.9
47.9
--
--
14.4
28.8
9.6
28.8
2
38.3
38.3
--
--
11.5
23
7.6
23
3
25.5
25.5
--
--
7.7
15.4
5.1
15.4
4
19.1
19.1
--
--
5.8
11.6
3.8
11.6
6
12.7
12.7
7.6
7.6
3.8
7.6
2.5
7.6
8
--
--
--
--
2.8
5.7
1.9
5.7
10
7.6
7.6
4.6
4.6
2.3
4.6
1.1
4.6
13
--
--
--
3.57
1.7
3.4
0.9
3.4
16
4.7
4.7
2.9
2.9
1.4
2.8
0.7
2.8
20
3.8
3.8
2.3
2.3
1.1
2.2
0.5
2.2
25
3.0
3.0
1.8
1.8
0.9
1.8
0.4
1.8
32
2.4
2.4
1.4
1.4
0.7
1.4
0.3
1.4
40
1.9
1.9
1.1
1.1
0.6
1.2
0.28
1.2
50
--
--
0.9
0.9
0.5
1.0
0.23
1.0
63
--
--
0.7
0.7
0.4
0.8
0.2
0.8
80
--
--
--
--
0.3
0.6
0.14
0.6
100
--
--
--
--
0.2
0.4
0.1
0.4
125
--
--
--
--
0.16
0.3
0.1
0.3
At U
o
= 240 V AC,
Z
s
× 1.04 applies.
At U
o
= 127 V AC,
Z
s
× 0.55 applies.
© Siemens AG 2008