98 / 582
BETA Protecting
Miniature Circuit Breakers
Configuration
1/76
Siemens ET B1 · 10/2008
1
*
You can order this quantity or a multiple thereof.
Selectivity for miniature circuit breakers/miniature circuit breakers
Within narrow limits, miniature circuit breakers also offer selectivity
between circuit breakers in a fuseless distribution board.
The following table shows the short-circuit current in kA up to
which selectivity is still maintained between series-connected
miniature circuit breakers at 230 V AC.
This depends on the let-through peak current
Î
of the down-
stream miniature circuit breaker and on the tripping current of
the upstream miniature circuit breaker.
Limit values of selectivity for miniature circuit breakers/circuit breakers in kA
T
r
full selectivity up to rated breaking capacity
I
cn
of the downstream protective device.
1)
In 240/415 V, 50 Hz systems, the selectivity limits are reduced by 10 %.
The selectivity limits for adjustable releases apply to the maximum value,
I
n
= rated current.
I
>
r
tripping current.
Downstream miniature circuit breakers
Upstream miniature circuit breakers
5
SY4 ...-7
Characteristic C
5
SP4 ...-7
Characteristic C
5
SP4 ...-8
Characteristic D
I
n
[
A]
20
25
32
40
50
80
100
80 100
I
>[A]
200 250 320 400 500 800
1000 1200 1500
I
cn
[
kA]
10
10
10
10
10
10
10
10
10
Selectivity limits [kA]
1)
5
SY
Characteristic B
6
30 6/10/15 0.2
0.2
0.3
0.5
0.5
0.8
1.5
3
5
10
50 6/10/15 0.2
0.2
0.3
0.5
0.5
0.8
1.2
3
4
13
65 6/10/15 0.2
0.2
0.3
0.4
0.5
0.8
1.2
2
3
16
80 6/10/15 0.2
0.2
0.3
0.4
0.5
0.8
1.2
2
3
20
100 6/10/15 --
0.2
0.3
0.4
0.5
0.8
1.2
2
3
25
125 6/10/15 --
--
--
0.4
0.4
0.6
1.2
1.5
3
32
160 6/10/15 --
--
--
0.4
0.4
0.6
1.2
1.5
3
40
200 6/10/15 --
--
--
--
0.4
0.6
1.2
1.5
2.5
50
250 6/10/15 --
--
--
--
--
0.6
1
1.5
2.5
Characteristic C
0.5
5 6/10/15 0.2
0.3
0.5
0.8
0.8
1.2
4
T
T
1
10 6/10/15 0.2
0.3
0.5
0.8
0.8
1.2
4
T
T
1.5 15 6/10/15 0.2
0.3
0.5
0.8
0.8
1.2
4
T
T
2
20 6/10/15 0.2
0.3
0.5
0.8
0.8
1.2
4
T
T
3
30 6/10/15 0.2
0.2
0.3
0.5
0.5
0.8
1.5
3
4
4
40 6/10/15 0.2
0.2
0.3
0.5
0.5
0.8
1.5
3
4
6
60 6/10/15 0.2
0.2
0.3
0.5
0.5
0.8
1.5
3
4
8
80 6/10/15 0.2
0.2
0.3
0.4
0.4
0.6
1.2
2.5
3
10
100 6/10/15 0.2
0.2
0.3
0.4
0.4
0.6
1.2
2.5
3
13
130 6/10/15 0.2
0.2
0.3
0.4
0.4
0.6
1.2
2
3
16
160 6/10/15 0.2
0.2
0.3
0.4
0.4
0.6
1.2
2
3
20
200 6/10/15 --
0.2
0.3
0.4
0.4
0.6
1.2
2
3
25
250 6/10/15 --
--
--
0.3
0.4
0.6
1
1.5
2.5
32
320 6/10/15 --
--
--
0.3
0.4
0.6
1
1.5
2.5
40
400 6/10/15 --
--
--
--
--
--
0.8
1.5
2
50
500 6/10/15 --
--
--
--
--
--
0.8
1.5
2
63
630 6/10/15 --
--
--
--
--
--
0.8
1.2
1.5
© Siemens AG 2008