Current Transformers

Current transformers (CT) are devices that are used to transform the current from a high current into a lower current so that the power can then be measured and controlled. The transformers consist of a core, a primary and a secondary winding. When an alternating current flows through the primary winding, a magnetic flux is created which then induces an alternating current in the secondary winding. This alternating current is proportional to the current in its primary. Current transformers are also known as a "step-down transformers". Once the current has been reduced it can be safely monitored and measured using an ammeter.


Current transformers can perform circuit control and perform roles for safety protection and current limiting.


Current transformers are found in:


  • Generating stations,

  • Electrical substations

  • Commercial electric power distribution.

Types of Current Transformers


Toroidal Current Transformer - These transformers are shaped like a doughnut they do not contain a primary winding. Instead, the line that carries the current flowing in the network is threaded through a window or hole in the toroidal transformer. Toroidal transformers offer high efficiency with minimal excess noise and little excess leakage inductance.


Wound Current Transformer - The transformers primary winding is physically connected in series with the conductor that carries the measured current flowing in the circuit. The magnitude of the secondary current is dependent on the turns ratio of the transformer.


Bar-type Current Transformer – This type of current transformer uses the actual cable or bus-bar of the main circuit as the primary winding, which is equivalent to a single turn. They are fully insulated from the high operating voltage of the system and are usually bolted to the current carrying device.


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Description Price Current Ratio Bore Size Inner Diameter Transformer Type Overall Height Sensor Technology Overall Width Supply Voltage Input Current Overall Depth Output Current Minimum Temperature Maximum Temperature Dimensions
RS Stock No. 123-9539
Mfr. Part No.7KT1200
BrandSiemens
kr 885,34
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60:5 13mm - Straight Through - - - - 60A - 5 A - - 105 x 71 x 90 mm
RS Stock No. 175-6175
Mfr. Part No.4NC5228-2FE21
BrandSiemens
kr 740,07
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700:5 - - Window 62.2mm - 59.5mm - 700A 75.3mm 5 A -30°C +55°C 59.5 x 75.3 x 62.2 mm
RS Stock No. 175-6134
Mfr. Part No.4NC5115-2CC21
BrandSiemens
kr 643,07
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75:5 - - Window 65.6mm - 60mm - 75A 75.3mm 5 A -30°C +55°C 60 x 75.3 x 65.6 mm
RS Stock No. 175-6176
Mfr. Part No.4NC5231-2FE21
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kr 753,73
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800:5 - - Window 62.2mm - 59.5mm - 800A 75.3mm 5 A -30°C +55°C 59.5 x 75.3 x 62.2 mm
RS Stock No. 175-6207
Mfr. Part No.4NC5435-0CH21
BrandSiemens
kr 1 349,24
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1500:1 - - Window 84.1mm - 112mm - 1500A 127.5mm 1 A -30°C +55°C 112 x 127.5 x 84.1 mm
RS Stock No. 175-6135
Mfr. Part No.4NC5117-0CC21
BrandSiemens
kr 709,86
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100:1 - - Window 65.6mm - 60mm - 100A 75.3mm 1 A -30°C +55°C 60 x 75.3 x 65.6 mm
RS Stock No. 175-6158
Mfr. Part No.4NC5222-0CE21
BrandSiemens
kr 709,86
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200:1 30mm - Window 67.6mm - 60.6mm - 200A 78.4mm 1 A -30°C +55°C 60.6 x 78.4 x 67.6 mm
RS Stock No. 772-1212
Mfr. Part No.5SV8700-0KK
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kr 1 206,37
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- 20mm - Toroidal Ring 34mm - - - - - - -10°C +50°C -
RS Stock No. 175-6128
Mfr. Part No.3UL2900
BrandSiemens
kr 41,78
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- - - - 54mm - 9.2mm - - 18.3mm - -25°C +60°C 9.2 x 18.3 x 54 mm
RS Stock No. 175-6142
Mfr. Part No.4NC5121-2CC21
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kr 643,07
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150:5 - - Window 65.6mm - 60mm - 150A 75.3mm 5 A -30°C +55°C 60 x 75.3 x 65.6 mm
RS Stock No. 175-6169
Mfr. Part No.4NC5224-2DE21
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kr 730,00
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300:5 - - Window 67.6mm - 60.6mm - 300A 78.4mm 5 A -30°C +55°C 60.6 x 78.4 x 67.6 mm
RS Stock No. 175-6155
Mfr. Part No.4NC5124-2FE21
BrandSiemens
kr 697,78
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300:5 - - Window 65.6mm - 60mm - 300A 75.3mm 5 A -30°C +55°C 60 x 75.3 x 65.6 mm
RS Stock No. 175-6185
Mfr. Part No.4NC5326-2DE21
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kr 740,07
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500:5 - - Window 84.1mm - 82.5mm - 500A 98mm 5 A -30°C +55°C 82.5 x 98 x 84.1 mm
RS Stock No. 175-6177
Mfr. Part No.4NC5232-2FE21
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kr 753,73
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1000:5 30mm - Window 62.2mm - 59.5mm - 1000A 75.3mm 5 A -30°C +55°C 59.5 x 75.3 x 62.2 mm
RS Stock No. 175-6138
Mfr. Part No.4NC5117-2CC21
BrandSiemens
kr 643,07
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100:5 - - Window 65.6mm - 60mm - 100A 75.3mm 5 A -30°C +55°C 60 x 75.3 x 65.6 mm
RS Stock No. 175-6214
Mfr. Part No.4NC5438-2CJ21
BrandSiemens
kr 1 157,92
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2000:5 - - Window 84.1mm - 112mm - 2000A 127.5mm 5 A -30°C +55°C 112 x 127.5 x 84.1 mm
RS Stock No. 175-6210
Mfr. Part No.4NC5435-2CH21
BrandSiemens
kr 1 157,92
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1500:5 - - Window 84.1mm - 112mm - 1500A 127.5mm 5 A -30°C +55°C 112 x 127.5 x 84.1 mm
RS Stock No. 175-6187
Mfr. Part No.4NC5327-0DE21
BrandSiemens
kr 934,19
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600:1 - - Window 84.1mm - 82.5mm - 600A 98mm 1 A -30°C +55°C 82.5 x 98 x 84.1 mm
RS Stock No. 510-9152
Mfr. Part No.7KT1201
BrandSiemens
kr 819,53
Each
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- 13mm - Straight Through - - - - - - - - - -
RS Stock No. 175-6162
Mfr. Part No.4NC5223-0CE21
BrandSiemens
kr 709,86
Each
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250:1 - - Window 67.6mm - 60.6mm - 250A 78.4mm 1 A -30°C +55°C 60.6 x 78.4 x 67.6 mm