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Accessories and spare parts
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Siemens LV 10.1 · 2011
* You can order this quantity or a multiple thereof.
4NC51 window-type current transformers, used as pin-wound transformers, Classes 1 and 3, from 5 A to 75 A
Pin-winding increases the primary current of the current trans-
former. Consequently, window-type current transformers can
also be used for low primary currents.
Rated secondary current 5 A
4NC51 12-2BC20
Class 3
• For circular conductors with max. diameter 17.5 mm
• For 1 busbar up to max. 12 mm
×
10 mm
50
2.5
A
4NC51 12-2BC20
1 1 unit
103 0.426
60
2.5
A
4NC51 13-2BC20
1 1 unit
103 0.430
75
2.5
A
4NC51 15-2BC20
1 1 unit
103 0.431
4NC51 17-2CC20
Class 1
• For circular conductors with max. diameter 17.5 mm
• For 1 busbar up to max. 12 mm
×
10 mm
100
2.5
A
4NC51 17-2CC20
1 1 unit
103 0.340
150
2.5
A
4NC51 21-2CC20
1 1 unit
103 0.327
200
5
A
4NC51 22-2CE20
1 1 unit
103 0.339
250
5
A
4NC51 23-2CE20
1 1 unit
103 0.345
4NC52 22-2CE20
• For circular conductors with max. diameter 28 mm
• For 1 busbar up to max. 30 mm
×
10 mm
• For 2 busbars up to max. 25 mm
×
5 mm
200
5
A
4NC52 22-2CE20
1 1 unit
103 0.467
250
5
A
4NC52 23-2CE20
1 1 unit
103 0.474
300
5
A
4NC52 24-2CE20
1 1 unit
103 0.356
400
5
A
4NC52 25-2CE20
1 1 unit
103 0.379
4NC53 25-2CE20
• For circular conductors with max. diameter 36 mm
• For 1 busbars up to max. 50 mm
×
10 mm
• For 2 busbars up to max. 40 mm
×
5 mm
400
5
A
4NC53 25-2CE20
1 1 unit
103 0.452
500
5
A
4NC53 26-2CE20
1 1 unit
103 0.406
600
5
A
4NC53 27-2CE20
1 1 unit
103 0.425
750
5
A
4NC53 28-2CE20
1 1 unit
103 0.379
4NC54 31-2CH20
• For circular conductors with max. diameter 45 mm
• For 1 busbar up to max. 60 mm
×
10 mm
• For 2 busbars up to max. 60 mm
×
10 mm
• For 3 busbars up to max. 60 mm
×
5 mm
1000
10
A
4NC54 31-2CH20
1 1 unit
103 0.660
1250
10
A
4NC54 33-2CH20
1 1 unit
103 0.631
1500
10
A
4NC54 34-2CH20
1 1 unit
103 0.669
Rated primary current
I
pn
Rating P
n
DT Order No.
Price
per PU
PU
(UNIT,
SET,
M)
PS*/
P. unit
PG Weight
per PU
approx.
A
VA
kg
Basic type
4NC51 12 4NC51 13 4NC51 15 4NC51 17 4NC51 21 4NC51 22 4NC51 23
Rated primary
current
A 50
60
75
100
150
200
250
Rating
VA 2.5
2.5
2.5
2.5
2.5
5
5
Primary current to
be measured
Number of required pin windings
A
Class 3
Class 1
4NC51 used as pin-
wound transformer
5
10
--
--
--
--
--
--
10 5
6
--
10
--
--
--
15 --
4
5
--
10
--
--
20 --
3
--
5
--
10
--
25 2
--
3
4
6
8
8
30 --
2
--
--
5
--
--
40 --
--
--
--
--
5
--
50 --
--
--
2
3
4
5
75 --
--
--
--
2
--
--