5SY4-101-7 datasheet(9/64 Pages) SIEMENS

9 / 64 page

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

•

0.3

0.6

1.6

2.0

•

0.3

0.6

0.9

1.6

•

0.2

0.4

0.8

1.2

3.0

3.2

•

0.4

0.6

1.1

2.2

3.0

•

0.5

1.0

2.0

2.6

4.5

•

1.0

2.0

2.4

4.1

•

1.5

2.0

3.7

•

1.2

1.8

3.0

5.0

1.7

2.5

4.0

Characteristic B

0.3

0.4

0.7

1.2

3.0

3.2

•

0.4

0.6

1.0

2.2

3.0

5.0

•

0.5

1.0

2.2

3.0

5.0

•

1.0

2.0

2.4

4.0

•

2.0

2.4

4.0

•

2.0

3.5

•

1.7

2.9

•

2.0

4.0

Characteristic C

≤ 2

0.3

0.5

1.2

1.7

•

0.3

0.4

0.8

1.4

4.0

5.0

•

0.3

0.4

0.6

1.1

3.0

4.0

•

0.4

0.6

1.0

2.4

3.2

•

0.5

0.9

1.4

2.6

3.1

•

0.5

0.9

1.4

2.1

3.1

•

0.8

1.3

2.0

3.0

•

0.8

1.3

2.0

3.0

•

1.3

2.0

2.7

•

2.0

2.4

5.0

2.2

4.0

3.5

3.0

Characteristic D

≤ 2

0.3

0.4

0.7

1.3

3.0

•

0.3

0.4

0.7

1.2

3.0

•

0.4

0.6

1.0

2.5

4.0

•

0.5

0.9

2.0

3.0

•

0.7

1.4

2.0

3.1

•

1.4

2.0

3.1

•

1.7

3.0

•

1.7

3.0

•

2.4

5.0

4.0

• 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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