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5SW3-005 Folha de dados(PDF) 9 Page - Siemens Semiconductor Group

Nome de Peças 5SW3-005
Descrição Electrónicos  Miniature Circuit-Breakers (MCBs)
PDF  64 Pages
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Fabricante Electrônico  SIEMENS [Siemens Semiconductor Group]
Página de início  http://www.siemens.com/
Logo SIEMENS - Siemens Semiconductor Group

5SW3-005 Folha de dados(HTML) 9 Page - Siemens Semiconductor Group

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Description
2/9
Siemens I 2.1 · 2001
General Data
Miniature Circuit-Breakers (MCBs)
s Selectivity of miniature circuit-breakers/fuses
Generally, distribution networks
are configured as radial net-
works. An overcurrent device
must be provided at each re-
duction of the conductor cross
section. This results in a cas-
cade graded according to the
rated current, which should,
where possible, provide selec-
tivity.
Selectivity means, that in the
event of a fault, only the protec-
tive device in the vicinity of the
fault trips. Thus, parallel current
paths can continue to provide
the necessary power.
For MCBs with upstream fuses,
the selectivity limit essentially
depends on the current limits
and tripping characteristics of
the MCB as well as on the pre-
arcing I2t value of the fuse.
Therefore, MCBs with different
characteristics and rated
breaking capacities also have
different selectivity limits.
The subsequent tables show
the currents up to which selec-
tivity is provided between MCBs
and upstream fuses according
to DIN VDE 0636 Part 21. The
values specified in kA are limit
values which have been deter-
mined under unfavorable test
conditions. In practice, better
values can be obtained, de-
pending on the type of the up-
stream fuse.
Limit values of the MCBs/fuses selectivity
in kA
Downstream
MCBs
Upstream fuses
In [A]
16 A
20 A
25 A
35 A
50 A
63 A
80 A
100 A
5SX2
Characteristic A
≤ 2
0.4
0.7
2.0
•
•
•
•
•
3
0.3
0.6
1.6
2.0
•
•
•
•
4
0.3
0.6
0.9
1.6
•
•
•
•
6
0.2
0.4
0.8
1.2
3.0
3.2
•
•
10
-
0.4
0.6
1.1
2.2
3.0
•
•
16
-
-
0.5
1.0
2.0
2.6
4.5
•
20
-
-
-
1.0
2.0
2.4
4.1
•
25
-
-
-
-
1.5
2.0
3.7
•
32
-
-
-
-
1.2
1.8
3.0
5.0
40
-
-
-
-
-
1.7
2.5
4.0
Characteristic B
6
0.3
0.4
0.7
1.2
3.0
3.2
•
•
10
-
0.4
0.6
1.0
2.2
3.0
5.0
•
13
-
-
0.5
1.0
2.2
3.0
5.0
•
16
-
-
-
1.0
2.0
2.4
4.0
•
20
-
-
-
-
2.0
2.4
4.0
•
25
-
-
-
-
-
2.0
3.5
•
32
-
-
-
-
-
1.7
2.9
•
40
-
-
-
-
-
-
2.0
4.0
50
-
-
-
-
-
-
-
4.0
Characteristic C
≤ 2
0.3
0.5
1.2
1.7
•
•
•
•
3
0.3
0.4
0.8
1.4
4.0
5.0
•
•
4
0.3
0.4
0.6
1.1
3.0
4.0
•
•
6
-
0.4
0.6
1.0
2.4
3.2
•
•
8
-
-
0.5
0.9
1.4
2.6
3.1
•
10
-
-
0.5
0.9
1.4
2.1
3.1
•
13
-
-
-
0.8
1.3
2.0
3.0
•
16
-
-
-
0.8
1.3
2.0
3.0
•
20
-
-
-
-
1.3
2.0
2.7
•
25
-
-
-
-
-
2.0
2.4
5.0
32
-
-
-
-
-
-
2.2
4.0
40
-
-
-
-
-
-
-
3.5
50
-
-
-
-
-
-
-
3.0
63
-
-
-
-
-
-
-
3.0
Characteristic D
≤ 2
0.3
0.4
0.7
1.3
3.0
•
•
•
3
0.3
0.4
0.7
1.2
3.0
•
•
•
4
-
0.4
0.6
1.0
2.5
4.0
•
•
6
-
-
0.5
0.9
2.0
3.0
•
•
8
-
-
-
0.7
1.4
2.0
3.1
•
10
-
-
-
-
1.4
2.0
3.1
•
13
-
-
-
-
-
1.7
3.0
•
16
-
-
-
-
-
1.7
3.0
•
20
-
-
-
-
-
-
2.4
5.0
25
-
-
-
-
-
-
-
5.0
32
-
-
-
-
-
-
-
4.0
40
-
-
-
-
-
-
-
-
50
-
-
-
-
-
-
-
-
• r
≥ Rated breaking capacity 5SX2 acc. to EN 60 898
.
6 000
i21_01.fm Seite 9 Mittwoch, 20. Juni 2001 10:09 10



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