Electrotechnical components

Strip Wound Cores

 Introduction

Strip wound cores for transformers and chokes

Iskra, d. d. is one of the major Slovenian producers of various types of strip wound transformer cores made of oriented silicon
iron steel strip. With our own production line and highly trained personnel, we fulfill the requirements of local and foreign
markets.

To produce high-quality cores for transformer and chokes, we use an oriented silicon iron steel strip that contains 3% silicon. We
mainly produce cores from M103-27P and M089-27N materials. The strip thickness is 0.27 mm and can be used up to 200 Hz.
The grain oriented silicon iron steel strip Trafoperm N2 with thickness 0.1 mm cover the frequency range from 200 Hz to 2 kHz.

For the production of cores, we select our GOESS suppliers and ensure diligent control of production and the quality of the entire
working process. All cores are measured 100% by a computer controlled measurement system MDK1000A. The test reports are
available for our customers in PDF form.

Additional services

We also offer our customers cores insulated with a polyester film (Mylar foil) or cores coated with epoxy resin. Both insulations
are provided with UL file numbers.

Development of cores

Our engineers use their knowledge and experience to offer the professional advice you need for the planning and selection of
cores to meet your requirements.

Types of cores
.
Rectangular cores
?
.

Rectangular cut cores

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.

Oval cores
?
.

Oval cores with air gap

?
Standard cut cores: CM, CE, CG, C3U and C cores
?
Special cores according to customer demand
?

All types can be produced according to customer demand in various dimensions and shapes.

The standard cores are available in quality »A« (unground) or quality »C« (ground). The codes in the table for standard cores are
intended for quality »A«.

Electrotechnical components
 Introduction

Typical electromagnetic features of blank cores

Material Thickness Frequency Field strenght Minimum density
mm Hz Hef (A/cm) B(T)
M089-27N 0.27 50 0.3 1.4
M103-27P 0.27 50 0.3 1.6

Dimensions and tolerances

External diameter - D Tolerance Internal diameter - d Tolerance Height - h Tolerance
mm mm mm mm mm mm
< 10 ±0.4 < 10 ±0.3 < 10 +0.3
< 25 ±0.6 < 25 ±0.5 < 25 +0.4
< 50 ±1.0 < 50 ±0.5 < 50 +0.6
< 80 ±1.25 < 80 ±0.75 < 80 +0.8
< 100 ±1.5 < 100 ±1.0 < 100 +1.0
< 160 ±2.0 < 160 ±1.3 < 160 +1.5
< 200 ±2.5 < 200 ±1.5 < 200 +1.5
< 250 ±3.0 < 250 ±2.0 < 250 +2.0
< 300 ±3.5 < 250 ±2.5 < 300 +2.5

Remarks Dimensions

?
Toroidal cores are mostly used for power and instrument
transformers, chokes and rotary transformers.
?
We offer cores with various dimensions:external diameter from 18
to 300 mm,internal diameter from 13 to 250 mm,height from 5 to
105 mm.

?
Cores are produced in accordance with the DIN 42311 standard
customer request.
?
In order to achieve the best quality of cores,the D/
d=1.25 to 2 ratio
must be established.The stacking factor ç is the proportion
between the effective magnetized average and geometrical average
of the core.

Electrotechnical components
 Equations

The universal transformer equation

2×
p×f×
N×AFE ×
BPEAK VRMS - root mean square voltage
VRMS = = f×
4,44 × N×
AFE ×
BPEAK
2 f - frequency

N - number of turns

V AFE - core cross section area in m2

V RMS =
BPEAK - peak magnetic flux density in T (tesla, Vs/m2)
2

Hysteresis losses

WH »
hB1MAX
× .6
energy of hysteresis losses
PH - hysteresis losses

f - frequency
PH WH ×
» f »
h
× B1MAX
f× .6
h - hysteresis coefficient

Empirical exponent varied from about 1.4 – 1.8 but is often given 1.6 for silicon iron core.

Calculation of cross section area

AFE =P [
cm ]
,f =
2
50 Hz
AFE
P
- cross section area

- requested transformer power

f - frequency

Insulations of toroidal cores

The toroidal cores can be insulated with a Mylar foil 1 x 70 %, 2 x 2/3, etc or coated with epoxy resin. In some cases we put it in a plastic
housing.

All insulation materials are according to the UL94 V0 standard.

A typical polyester film (Mylar foil)is 50 microns thick and 5 or 10 mm wide.The UL file number is E93687.

The cores can be coated with Resicoat EL-HLG03R (800702) epoxy resin. The UL file number is E214934.

Electrotechnical components
 CM and CE cores

CM and CE cores

CM and CE cores consist of four core halves (see drawing bellow). The coil
former is on the middle leg. The transformer has horizontal or vertical
holders. The horizontal holder and cores are wrapped with a clamp. Vertical
holders of a core are fixed to the core with screws, washers and nuts.

Cut cores are mostly used for power transformers, chokes and special
transformers. C cores are distributed according to the standard;therefore
they are listed under labels CM and CE cores.

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Electrotechnical components
 CM and CE cores

CM cores
amax b-1 pt f c gmin emin rmax mFe IFe AFe Pn
Number Cores
mm mm mm mm mm mm mm kg cm cm2 VA
700121021000 CM42 43.6 21.8 15.2-0.7 6.0-0.8 9.5 31 1.5 0.054 9.8 0.72 5.3
700121031000 CM55 56.3 28.4 20.8-0.8 8.5-0.8 11.0 38.5 1.5 0.138 12.4 1.46 21.1
700121041000 CM65 65.6 33.2 27.0-0.8 9.9-0.9 13.0 45 1.5 0.250 14.6 2.24 45.7
700121051000 CM74 74.6 37.2 32.5-1.0 11.4-0.9 14.5 51 1.5 0.396 16.5 3.14 84
700121061000 CM85a 85.6 43.3 32.5-1.0 14.4-1.0 14.0 56 2.0 0.561 18.3 4.01 115
700121062000 CM85b 85.6 43.3 45.5-1.0 14.4-1.0 14.0 56 2.0 0.792 18.3 5.66 159
700121071000 CM102a 103.0 51.9 35.5-1.0 16.9-1.0 17.5 68 2.0 0.885 22.2 5.21 206
700121072000 CM102b 103.0 51.9 52.5-1.0 16.9-1.0 17.5 68 2.0 1.320 22.2 7.78 300

CE cores
amax b-1 pt f c gmin emin rmax mFe IFe AFe Pn
Number Cores
mm mm mm mm mm mm mm kg cm cm2 VA
CE60 52.2 30.5 20.5-0.8 9.9-0.8 10.5 32 1.5 0.150 11.4 1.72 20.4
CE66 57.2 33.5 22.5-0.8 10.9-0.8 11.5 35 1.5 0.138 12.4 1.46 30
CE78 68.2 39.5 27.0-0.9 12.9-0.8 13.5 42 2.0 0.342 14.9 3.00 63
CE84a 73.4 42.6 29.0-1.0 13.9-0.8 14.5 45 2.0 0.426 16.0 3.48 86
CE84b 73.4 42.6 29.0-1.0 13.9-0.8 14.5 45 2.0 0.640 16.0 5.23 125
CE92a 77.6 46.2 24.0-1.0 11.4-0.8 23.0 54 2.0 0.332 18.7 2.32 96
CE92b 77.6 46.2 33.0-1.0 11.4-0.8 23.0 54 2.0 0.461 18.7 3.22 131
CE106a 88.6 53.2 33.0-1.0 14.4-0.8 24.0 59 2.0 0.660 20.9 4.13 198
700122062000 CE106b 88.6 53.2 46.0-1.0 14.4-0.8 24.0 59 2.0 0.929 20.9 5.81 270
700123011000 CE130a 108.8 65.3 37.2-1.2 17.4-0.9 30.0 73 2.0 1.12 25.9 5.64 387
700123012000 CE130b 108.8 65.3 47.2-1.2 17.4-0.9 30.0 73 2.0 1.43 25.9 7.21 484
700123021000 CE150a 123.8 75.2 41.2-1.2 19.8-0.9 35.0 83 2.0 1.63 29.7 7.18 590
700123022000 CE150b 123.8 75.2 51.2-1.2 19.8-0.9 35.0 83 2.0 2.04 29.7 8.98 720
700123023000 CE150c 123.8 75.2 61.2-1.2 19.8-0.9 35.0 83 2.0 2.45 29.7 10.8 860
700123031000 CE170a 145.8 85.0 56.0-1.5 22.1-1.1 40.0 100 3.0 2.92 34.7 11.0 1130
700123032000 CE170b 145.8 85.0 66.0-1.5 22.1-1.1 40.0 100 3.0 3.42 34.7 12.9 1308
700123033000 CE170c 145.8 85.0 76.0-1.5 22.1-1.1 40.0 100 3.0 3.96 34.7 14.9 1490
700123041000 CE195a 186.8 98.2 57.0-1.5 27.3-1.1 42.5 130 3.0 4.53 42.9 13.8 1890
700123043000 CE195c 186.8 98.2 85.0-1.5 27.3-1.1 42.5 130 3.0 6.83 42.9 20.8 2690
700123051000 CE231a 216.0 116.1 63.0-1.5 32.1-1.3 50.5 149 3.0 6.87 49.9 18.0 3000
700123052000 CE231b 216.0 116.1 79.0-1.5 32.1-1.3 50.5 149 3.0 8.67 49.9 22.7 3710
700123053000 CE231c 216.0 116.1 98.0-1.5 32.1-1.3 50.5 149 3.0 10.77 49.9 28.2 4400

Electrotechnical components
 CU cores

CU cores

CU cores consist of two core halves (see drawing bellow). The coil formers
are on both legs. Horizontal holders are tight to cores by a clamp.

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Electrotechnical components
 CU cores

CU cores
amax b-1 pt f c gmin emin rmax mFe IFe AFe Pn
Number Cores
mm mm mm mm mm mm mm kg cm cm2 VA
CU15a 28.7 15 5.4-0.4 4.9-0.5 5 18.5 1.5 0.010 6.1 0.21
CU15b 28.7 15 8.4-0.4 4.9-0.5 5 18.5 1.5 0.015 6.1 0.33
CU24a 42.7 24 8.5-0.5 7.9-0.6 8 26.5 1.5 0.042 9.2 0.59
CU24b 42.7 24 13.5-0.5 7.9-0.6 8 26.5 1.5 0.066 9.2 0.94
700124011000 CU30a 52.7 30 10.1-0.6 9.9-0.8 10 32.5 1.5 0.072 11.4 0.82 3.3
700124012000 CU30b 52.7 30 16.1-0.6 9.9-0.8 10 32.5 1.5 0.117 11.4 1.34 6.3
700124021000 CU39a 67.9 39.1 13.4-0.9 12.9-0.8 13 41.5 1.5 0.163 14.8 1.44 12.4
700124022000 CU39b 67.9 39.1 20.4-0.9 12.9-0.8 13 41.5 1.5 0.254 14.8 2.24 20
700124031000 CU48a 82.9 48 16.5-1.0 15.8-0.9 16 50.5 1.5 0.303 18.1 2.19 30.5
700124032000 CU48b 82.9 48 25.5-1.0 15.8-0.9 16 50.5 1.5 0.480 18.1 3.47 48.6
700124041000 CU60a 103.6 60.1 20.6-1.1 19.8-0.9 20 63 2.0 0.605 22.6 3.50 82
700124042000 CU60b 103.6 60.1 30.6-1.1 19.8-0.9 20 63 2.0 0.915 22.6 5.30 122
700124051000 CU75a 128.6 75 26.1-1.1 24.7-1.0 25 78 2.0 1.22 28.2 5.63 200
700124052000 CU75b 128.6 75 41.1-1.1 24.7-1.0 25 78 2.0 1.94 28.2 9.01 306
700124061000 CU90a 155.8 90 30.9-1.4 29.6-1.1 30 95 3.0 2.08 34 7.99 387
700124062000 CU90b 155.8 90 50.9-1.4 29.6-1.1 30 95 3.0 3.49 34 13.4 630
700124071000 CU102a 175.4 102.4 35.4-1.4 33.7-1.2 34 106 3.0 3.08 38.4 10.5 620
700124072000 CU102b 175.4 102.4 56.4-1.4 33.7-1.2 34 106 3.0 4.99 38.4 17.0 960
700124081000 CU114a 195.6 114.4 39.2-1.7 37.6-1.3 38 118 3.0 4.23 42.8 12.9 920
700124082000 CU114b 195.6 114.4 63.2-1.7 37.6-1.3 38 118 3.0 6.96 42.8 21.2 1440
700124091000 CU132a 225.4 132.1 45.2-1.7 43.4-1.4 44 136 3.0 6.59 49.5 17.4 1580
700124092000 CU132b 225.4 132.1 71.2-1.7 43.4-1.4 44 136 3.0 10.49 49.5 27.7 2370
700124101000 CU150a 255.6 150.2 51.2-1.7 49.4-1.5 50 154 3.0 9.67 56.2 22.5 2370
700124102000 CU150b 255.6 150.2 76.2-1.7 49.4-1.5 50 154 3.0 14.58 56.2 33.9 3380
700124111000 CU168a 286.0 168.3 57.0-2.0 55.3-1.6 56 172 3.0 13.54 63.0 28.1 3620
700124112000 CU168b 286.0 168.3 91.0-2.0 55.3-1.6 56 172 3.0 21.88 63.0 45.4 5400
700124121000 CU180a 307.2 181.3 62.0-2.0 59.7-1.8 60 184 3.0 17.08 67.6 33.0 4560
700124122000 CU180b 307.2 181.3 77.0-2.0 59.7-1.8 60 184 3.0 21.36 67.6 41.3 5500
700124123000 CU180c 307.2 181.3 92.0-2.0 59.7-1.8 60 184 3.0 25.60 67.6 49.5 6400
700124131000 CU210a 357.2 211.2 71.7-2.2 69.6-2.0 70 214 3.0 26.85 78.7 44.6 7800
700124132000 CU210b 357.2 211.2 101.7-2.2 69.6-2.0 70 214 3.0 38.47 78.7 63.9 10500
700124133000 CU210c 357.2 211.2 131.7-2.2 69.6-2.0 70 214 3.0 50.09 78.7 83.2 12900

Electrotechnical components
 CG cores

CG cores

CG cores consist of four core halves (see drawing bellow). The coil formers
are on both middle legs.There are horizontal and vertical holders. The
horizontal holders are fixed to cores with one or two clamps. The vertical
holders are fixed to the core by screws, washers and nuts.

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Electrotechnical components
 CG cores

CG cores
amax b-1 pt f c gmin emin rmax mFe IFe1 AFe Pn
Number Cores
mm mm mm mm mm mm mm kg cm cm2 VA
700125011000 CG27/6 29.4 21.0 7.2 7.2-0.8 6.4 14.3 1.0 0.018 6.3 0.37
700125021000 CG33/8 35.7 25.8 8.7 8.7-0.8 7.9 17.5 1.0 0.035 7.8 0.58
700125031000 CG41/9 43.7 30.6 10.3 10.3-0.8 9.5 22.2 1.0 0.063 9.5 0.86
700125041000 CG48/9 50.0 32.1 10.3 10.3-0.8 11.1 28.6 1.0 0.074 11.1 0.86
700125051000 CG54/13 56.4 30.6 13.5 8.7-0.8 12.7 38.1 1.5 0.094 12.8 0.96 16
700125052000 CG54/19 56.4 30.6 19.8 8.7-0.8 12.7 38.1 1.5 0.141 12.8 1.44 25
700125053000 CG54/25 56.4 30.6 26.2 8.7-0.8 12.7 38.1 1.5 0.187 12.8 1.92 34
700125054000 CG54/38 56.4 30.6 38.9 8.7-0.8 12.7 38.1 1.5 0.281 12.8 2.88 50
700125061000 CG70/13 73.0 36.9 13.5 10.3-0.8 15.9 50.8 1.5 0.145 16.5 1.15 33
700125062000 CG70/13 73.0 36.9 19.8 10.3-0.8 15.9 50.8 1.5 0.218 16.5 1.17 51
700125063000 CG70/25 73.0 36.9 26.2 10.3-0.8 15.9 50.8 1.5 0.291 16.5 2.30 68
700125064000 CG70/32 73.0 36.9 32.5 10.3-0.8 15.9 50.8 1.5 0.363 16.5 2.87 84
700125071000 CG76/19 79.4 40.1 19.8 10.3-0.8 19.0 57.2 3.0 0.239 18.1 1.72 65
700125072000 CG76/25 79.4 40.1 26.2 10.3-0.8 19.0 57.2 3.0 0.319 18.1 2.30 87
700125073000 CG76/32 79.4 40.1 32.5 10.3-0.8 19.0 57.2 3.0 0.398 18.1 2.87 108
700125074000 CG76/38 79.4 40.1 38.9 10.3-0.8 19.0 57.2 3.0 0.478 18.1 3.45 128
700125081000 CG89/22 92.1 49.6 23.0 13.5-0.8 22.2 63.5 3.0 0.432 21.1 2.68 131
700125082000 CG89/29 92.1 49.6 29.4 13.5-0.8 22.2 63.5 3.0 0.553 21.1 3.45 168
700125083000 CG89/38 92.1 49.6 38.9 13.5-0.8 22.2 63.5 3.0 0.739 21.1 4.60 219
700125084000 CG89/51 92.1 49.6 51.6 13.5-0.8 22.2 63.5 3.0 0.989 21.1 6.13 286
700125091000 CG108/19 111.1 62.3 19.8 16.7-0.8 28.6 76.2 3.0 0.567 25.9 2.87 206
700125092000 CG108/29 111.1 62.3 29.4 16.7-0.8 28.6 76.2 3.0 0.898 25.9 4.54 319
700125093000 CG108/38 111.1 62.3 38.9 16.7-0.8 28.6 76.2 3.0 1.14 25.9 5.75 400
700125094000 CG108/51 111.1 62.3 51.6 16.7-0.8 28.6 76.2 3.0 1.52 25.9 7.66 520
700125101000 CG127/25 130.2 75.0 26.2 19.8-0.8 34.9 88.9 3.0 1.08 30.7 4.60 430
700125102000 CG127/38 130.2 75.0 38.9 19.8-0.8 34.9 88.9 3.0 1.62 30.7 6.90 630
700125103000 CG127/51 130.2 75.0 51.6 19.8-0.8 34.9 88.9 3.0 2.16 30.7 9.23 800
700125104000 CG127/70 130.2 75.0 71.4 19.8-0.8 34.9 88.9 3.0 2.97 30.7 12.70 1090
700125108000 CG165/32 169.9 97.2 32.5 26.2-0.8 44.4 114.3 3.0 2.36 40.2 7.68 1060
700125109000 CG165/51 169.9 97.2 51.5 26.2-0.8 44.4 114.3 3.0 3.77 40.2 12.30 1620

10

Electrotechnical components
 C3U cores

C3U cores

C3U cores consist of two core halves (see drawing bellow). The coil formers
are on all three legs. Horizontal holders are tight to cores by two clamps.

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Electrotechnical components
 C3U cores

C3U cores
amax b-1 pt f c gmin emin rmax mFe IFe1 IFe2 AFe Pn
Number Cores
mm mm mm mm mm mm mm kg cm cm cm2 VA
700126021000 C3U39a 68.9 66 13.4-0.9 12.9-0.8 13 41.5 1.5 0.261 12.7 22.1 1.43 17.7
700126022000 C3U39b 68.9 66 20.4-0.9 12.9-0.8 13 41.5 1.5 0.407 12.7 22.1 2.24 27.9
700126031000 C3U48a 83.9 80.8 16.6-1.0 15.8-0.9 16 50.5 1.5 0.491 15.5 27.2 2.20 44.1
700126032000 C3U48b 83.9 80.8 25.6-1.0 15.8-0.9 16 50.5 1.5 0.776 15.5 27.2 3.49 68
700126041000 C3U60a 104.6 100.9 20.6-1.1 19.8-0.9 20 63 2.0 0.945 19.4 33.9 3.51 118
700126042000 C3U60b 104.6 100.9 30.6-1.1 19.8-0.9 20 63 2.0 1.47 19.4 33.9 5.30 172
700126051000 C3U75a 129.7 125.7 26.1-1.1 24.7-1.0 25 78 2.0 1.82 24.1 42.2 5.63 287
700126052000 C3U75b 129.7 125.7 41.1-1.1 24.7-1.0 25 78 2.0 2.93 24.1 42.2 9.01 432
700126061000 C3U90a 156.8 150.6 30.9-1.4 29.6-1.1 30 95 3.0 3.33 29.1 50.8 7.99 550
700126062000 C3U90b 156.8 150.6 50.9-1.4 29.6-1.1 30 95 3.0 5.59 29.1 50.8 13.4 840
700126071000 C3U102a 176.4 171.1 35.4-1.4 33.7-1.2 34 106 3.0 4.94 32.8 57.5 10.5 850
700126072000 C3U102b 176.4 171.1 56.4-1.4 33.7-1.2 34 106 3.0 8.00 32.8 57.5 17.0 1270
700126081000 C3U114a 196.2 191 39.2-1.7 37.6-1.3 38 118 3.0 6.79 36.6 64.2 12.9 1280
700126082000 C3U114b 196.2 191 63.2-1.7 37.6-1.3 38 118 3.0 11.14 36.6 64.2 21.2 1910
700126091000 C3U132a 226.4 220.5 45.2-1.7 43.4-1.4 44 136 3.0 10.54 42.3 74.2 17.4 2170
700126092000 C3U132b 226.4 220.5 71.2-1.7 43.4-1.4 44 136 3.0 16.84 42.3 74.2 27.7 3090
700126101000 C3U150a 255.6 249.6 51.2-1.7 49.4-1.5 50 154 3.0 15.53 48 84.3 22.5 3100
700126102000 C3U150b 255.6 249.6 76.2-1.7 49.4-1.5 50 154 3.0 23.38 48 84.3 33.9 4310
700126111000 C3U168a 286.0 279.6 57.0-2.0 55.3-1.6 56 172 3.0 21.68 53.8 94.4 28.1 4780
700126112000 C3U168b 286.0 279.6 91.0-2.0 55.3-1.6 56 172 3.0 35.07 53.8 94.4 45.4 6770
700126121000 C3U180a 307.0 301.0 62.0-2.0 59.7-1.8 60 184 3.0 27.38 57.7 101.5 33.0 6000
700126122000 C3U180b 307.0 301.0 77.0-2.0 59.7-1.8 60 184 3.0 34.23 57.7 101.5 41.3 7100
700126123000 C3U180c 307.0 301.0 92.0-2.2 59.7-1.8 60 184 3.0 41.07 57.7 101.5 49.5 8000
700126131000 C3U210a 357.2 350.8 71.7-2.2 69.6-2.0 70 214 3.0 43.12 67.2 118.2 44.6 10100
700126132000 C3U210b 357.2 350.8 101.7-2.2 69.6-2.0 70 214 3.0 61.74 67.2 118.2 63.9 12600
700126133000 C3U210c 357.2 350.8 131.7-2.2 69.6-2.0 70 214 3.0 80.35 67.2 118.2 82.3 15100

12

Electrotechnical components
 Materials: GOESS

GOESS - grain oriented silicon iron steel strip

Type of GOESS materials

Cammon Description in acc. Old Newlabel in acc. Loss in Thickness Loss of W/kg
description with DIN 46400 label with EN10107 magnetization mm 1.5 T 1.7 T
M0 – 27M0H M103-27P low 0.27 1.03
M0 – 30M0H M105-30P low 0.3 1.05
M1 VM111-30P 30M1H M111-30P low 0.3 1.11
M2 VM117-30P 30M2H M117-30P low 0.3 1.17
– – M120-23S decreas 0.23 0.77 1.2
M3 VM130-27S 27M3 M130-27S decreas 0.27 0.85 1.3
M3 – 23M3 M080-23N normal 0.23 0.8 1.27
M4 VM89-27N 27M4 M089-27N normal 0.27 0.89 1.4
M5 VM97-30N 30M5 M097-30N normal 0.3 0.97 1.5
M6 VM111-35N 35M6 M111-35N normal 0.35 1.11 1.65
VM140-30S – M140-30S decreas 0.3 0.92 1.4
VM155-35S – M155-35S decreas 0.35 1.05 1.55
M7 – 50M7 M175-50N normal 0.5 1.75
95H23 M100-23P low 0.23 0.95
Trafoperm N2 GO10 N2 0.1 1.1

Appearant power of single phase core Appearant power of three phase core
10 000 100 000
[VA] 8
[VA] 8
6 6
5 5
4 4
3 3

2 2

1000 10 000
8 8
Appearant power

6 6
5 5
Appearant power

4 4
3 3

2 2
d = 0,30 mm
f = 50 Hz
100 1000
8 8
6 6
5 5
4 4
3 3

2 2
d = 0,30 mm
f = 50 Hz
10 100
8 8
6 6
5 5
4 4
3 3
2 2

1 10
2 3 4 5 6 7 8 0,1 2 3 4 5 6 7 891 2 3 4 5 6 78 10 2 3 4 5 0,1 2 3 4 5 6 7 8 91 2 3 4 5 6 7 8 10 2 3 4 5 6 7 8100 2 3 4 5
[kg] [kg]
Weight Weight

13

Electrotechnical components
 Accessories

Toroidal cores

?
Rubber washer
?
Tinned round plate

CM, CE, CU, CG and C3U standard cores are provided with following accessories:

Clamps
?

Cartoon washer
?

Plastic coilformers
?

Vertical and horizontal holders

?

Welded Nut Bolt

f
d

f
b

b
b

e
c

r1
g c c
f
a a

14

Electrotechnical components
 Accessories

Clamp, bolt and nut

a b c e Screw
Clamps Code d f r1 Bolt Nut
DIN84
a b c a b c
CM42 732501021000 116 7 0.3 2.5 4 12.5 2.5 7 5 2.8 7 5 M2.5 M2.5x16
CM55 732501031000 147 7 0.3 2.5 4 12.5 2.5 7 5 2.8 7 5 M2.5 M2.5x18
CM65 732501041000 173 7 0.3 2.5 4 12.5 2.5 7 5 2.8 7 5 M2.5 M2.5x20
CM74 732501051000 196 9 0.3 3.5 6 16.5 3 9 6 3.3 9 6 M3 M3x25
CM85 732501061000 222 9 0.3 3.5 6 16.5 3 9 6 3.3 9 6 M3 M3x30
CM102 732501071000 269 9 0.3 3.5 6 16.5 3 9 6 3.3 9 6 M3 M3x30

CE92 732503051000 119 9 0.3 3.5 6 16.5 3 9 6 3.3 9 6 M3 M3x30

CE106 732503061000 246 9 0.3 3.5 6 16.5 3 9 6 3.3 9 6 M3 M3x30
CE130 732503071000 305 9 0.3 3.5 6 16.5 3 9 6 3.3 9 6 M3 M3x30
CE150 732503081000 350 9 0.3 3.5 6 16.5 3 9 6 3.3 9 6 M3 M3x30
CE170 732503091000 405 9 0.3 3.5 6 16.5 3 9 6 3.3 9 6 M3 M3x30

CU30 732504011000 140 7 0.3 2.5 4 12.5 2.5 7 5 2.8 7 5 M2.5 M2.5x18
CU39 732504021000 182 7 0.3 2.5 4 12.5 2.5 7 5 2.8 7 5 M2.5 M2.5x20
CU48 732504031000 221 9 0.3 3.5 6 16.5 3 9 6 3.3 9 6 M3 M3x30
CU60 732504041000 281 9 0.3 3.5 6 16.5 3 9 6 3.3 9 6 M3 M3x30
CU75 732504051000 351 9 0.3 3.5 6 16.5 3 9 6 3.3 9 6 M3 M3x30
CU90 732504061000 427 12 0.4 4.5 9 21 4 12 8 4.3 12 8 M4 M4x35
CU102 732504071000 481 12 0.4 4.5 9 21 4 12 8 4.3 12 8 M4 M4x35
CU114 732504081000 538 12 0.4 4.5 9 21 4 12 8 4.3 12 8 M4 M4x35
CU132 732504091000 620 12 0.4 4.5 9 21 4 12 8 4.3 12 8 M4 M4x35
CU150 732504101000 705 12 0.4 4.5 9 21 4 12 8 4.3 12 8 M4 M4x35
CU168 732504111000 780 15 0.6 5.5 12 37 5 15 10 5.3 15 10 M5 M5x35
CU180 732504121000 850 15 0.4 5.5 12 37 4 15 10 5.3 15 10 M5 M5x50
CU210 732504131000 998 15 0.4 5.5 12 37 4 15 10 5.3 15 10 M5 M5x50

CG127/51 732505101000 355 9 0.3 3.5 6 16.5 3 9 6 3.3 9 6 M3 M3x30

C3U39 732504021000 238 9 0.3 3.5 6 16.5 3 9 6 3.3 9 6 M3 M3x30

C3U48 732506031000 285 9 0.3 3.5 6 16.5 3 9 6 3.3 9 6 M3 M3x30
C3U60 732506041000 363 9 0.3 3.5 6 16.5 3 9 6 3.3 9 6 M3 M3x30
C3U75 732506051000 446 12 0.4 4.5 9 21 4 12 8 4.3 12 8 M4 M4x35
C3U90 732506061000 545 12 0.4 4.5 9 21 4 12 8 4.3 12 8 M4 M4x35
C3U102 732506071000 617 12 0.4 4.5 9 21 4 12 8 4.3 12 8 M4 M4x40
C3U114 732506081000 691 14 0.5 5.5 12 37 5 15 10 5.3 15 10 M5 M5x45
C3U132 732506092000 800 14 0.5 5.5 12 37 5 15 10 5.3 15 10 M5 M5x45
C3U150 732506101000 910 15 0.5 5.5 12 37 5 15 10 5.3 15 10 M5 M5x45
C3U168 732506111000 1000 15 0.5 5.5 12 37 5 15 10 5.3 15 10 M5 M5x45
C3U180 732506121000 1075 15 0.5 5.5 12 37 5 15 10 5.3 15 10 M5 M5x45
C3U210 732506131000 1270 15 0.5 5.5 12 37 5 15 10 5.3 15 10 M5 M5x45
Remarks: ?
A set of clamps consist of clamps, a bolt, a nut and a screw.
?
All Type b cores are supplied with two sets of clamps. 15

Electrotechnical components
 Accessories

Core with holder - CM102a

Core with holder - CU60b

16

Electrotechnical components
 Accessories, Measurements

Core with holder - C3U60a

MDK1000A computer controlled measurement system

The electromagnetic properties of cores are

measured by an MDK1000A computer controlled
measurement system. A BH curve, current and
voltage shapes and their RMS values are
displayed. The cores are measured in one, two or
three points or by scanning. All parameters are
memorized on a hard disk. The table below the
diagrams shows electromagnetic values in
numbers. A customer can get these results in a
PDF form by E-mail.

17

Electrotechnical components
 Special cores

Coated oval cores

Toroidal cores with an air gap

18

Electrotechnical components
 Special cores

Rectangular cores

Toroidal cores with Mylar insulation

19

Electrotechnical components
 Published by Iskra, d. d. • Version 1.0, March 2013

Iskra, d.d.
Stegne 21
SI-1000 Ljubljana
Slovenia
Phone: +386 1 51 31 000

www.iskra.eu
iskra@iskra.eu