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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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 - Panel Mount 7KT12
RS Stock No. 175-6158
Mfr. Part No.4NC5222-0CE21
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kr 689,87
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200:1 30mm Window 67.6mm 60.6mm 78.4mm 200A 1 A -30°C +55°C 60.6 x 78.4 x 67.6 mm Sentron Power Monitoring Devices Chassis Mount Sentron
RS Stock No. 123-9515
Mfr. Part No.4NC5123-0CE20
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kr 613,25
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250:1 17.5mm Window - - - 250A 1 A -10°C 55°C 74.5 x 48 x 80 mm Measuring Devices Panel Mount 4NC
RS Stock No. 175-6159
Mfr. Part No.4NC5222-0DE21
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kr 742,71
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200:1 30mm Window 67.6mm 60.6mm 78.4mm 200A 1 A -30°C +55°C 60.6 x 78.4 x 67.6 mm Sentron Power Monitoring Devices Chassis Mount Sentron
RS Stock No. 175-6168
Mfr. Part No.4NC5224-2CE21
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kr 625,07
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300:5 - Window 67.6mm 60.6mm 78.4mm 300A 5 A -30°C +55°C 60.6 x 78.4 x 67.6 mm Sentron Power Monitoring Devices Chassis Mount Sentron
RS Stock No. 175-6144
Mfr. Part No.4NC5121-2FA21
BrandSiemens
kr 732,74
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150:5 - Window 65.6mm 60mm 75.3mm 150A 5 A -30°C +55°C 60 x 75.3 x 65.6 mm Sentron Power Monitoring Devices Chassis Mount Sentron
RS Stock No. 123-9516
Mfr. Part No.4NC5123-2CE20
BrandSiemens
kr 555,03
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250:5 17.5mm Window - - - 250A 5 A -10°C 55°C 74.5 x 48 x 80 mm Measuring Devices Panel Mount 4NC
RS Stock No. 175-6186
Mfr. Part No.4NC5327-0CE21
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kr 793,55
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600:1 - Window 84.1mm 82.5mm 98mm 600A 1 A -30°C +55°C 82.5 x 98 x 84.1 mm Sentron Power Monitoring Devices Chassis Mount Sentron
RS Stock No. 175-6206
Mfr. Part No.4NC5434-2CH21
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kr 1 106,58
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1250:5 - Window 84.1mm 112mm 127.5mm 1.25kA 5 A -30°C +55°C 112 x 127.5 x 84.1 mm Sentron Power Monitoring Devices Chassis Mount Sentron
RS Stock No. 175-6189
Mfr. Part No.4NC5327-2DE21
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kr 732,74
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600:5 - Window 84.1mm 82.5mm 98mm 600A 5 A -30°C +55°C 82.5 x 98 x 84.1 mm Sentron Power Monitoring Devices Chassis Mount Sentron
RS Stock No. 175-6129
Mfr. Part No.4NC5112-0CB21
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kr 689,87
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50:1 - Window 65.6mm 60mm 75.3mm 50A 1 A -30°C +55°C 60 x 75.3 x 65.6 mm Sentron Power Monitoring Devices Chassis Mount Sentron
RS Stock No. 175-6160
Mfr. Part No.4NC5222-2CE21
BrandSiemens
kr 625,07
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200:5 - Window 67.6mm 60.6mm 78.4mm 200A 5 A -30°C +55°C 60.6 x 78.4 x 67.6 mm Sentron Power Monitoring Devices Chassis Mount Sentron
RS Stock No. 175-6207
Mfr. Part No.4NC5435-0CH21
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kr 1 335,88
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1500:1 - Window 84.1mm 112mm 127.5mm 1.5kA 1 A -30°C +55°C 112 x 127.5 x 84.1 mm Sentron Power Monitoring Devices Chassis Mount Sentron
RS Stock No. 175-6156
Mfr. Part No.4NC5125-2FE21
BrandSiemens
kr 690,87
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300:5 - Window 65.6mm 60mm 75.3mm 300A 5 A -30°C +55°C 60 x 75.3 x 65.6 mm Sentron Power Monitoring Devices Chassis Mount Sentron
RS Stock No. 175-6166
Mfr. Part No.4NC5224-0CE21
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kr 689,87
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300:1 - Window 67.6mm 60.6mm 78.4mm 300A 1 A -30°C +55°C 60.6 x 78.4 x 67.6 mm Sentron Power Monitoring Devices Chassis Mount Sentron
RS Stock No. 175-6224
Mfr. Part No.4NC5930-5LT21
BrandSiemens
kr 49,85
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- - - - - - - - - - - 4NC53 Current Transformers H-Rail Mount Sentron
RS Stock No. 175-6190
Mfr. Part No.4NC5330-0CE21
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kr 793,55
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750:1 - Window 84.1mm 82.5mm 98mm 750A 1 A -30°C +55°C 82.5 x 98 x 84.1 mm Sentron Power Monitoring Devices Chassis Mount Sentron
RS Stock No. 175-6176
Mfr. Part No.4NC5231-2FE21
BrandSiemens
kr 732,74
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800:5 - Window 62.2mm 59.5mm 75.3mm 800A 5 A -30°C +55°C 59.5 x 75.3 x 62.2 mm Sentron Power Monitoring Devices Chassis Mount Sentron
RS Stock No. 175-6182
Mfr. Part No.4NC5326-0CE21
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kr 793,55
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500:1 - Window 84.1mm 82.5mm 98mm 500A 1 A -30°C +55°C 82.5 x 98 x 84.1 mm Sentron Power Monitoring Devices Chassis Mount Sentron
RS Stock No. 175-6215
Mfr. Part No.4NC5438-2DL21
BrandSiemens
kr 1 146,46
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2000:5 - Window 84.1mm 112mm 127.5mm 2kA 5 A -30°C +55°C 112 x 127.5 x 84.1 mm Sentron Power Monitoring Devices Chassis Mount Sentron