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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N° de stock RS 886-2115
Référence fabricantXW01-105081S000000
19,24 €
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30:5 - Base Mounted - - - - - - - - - 62 x 40 x 78 mm -
N° de stock RS 123-6732
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45,00 €
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250:5 - Base Mounted - - - - 250A - 5 A +20°C +70°C - -
N° de stock RS 886-2171
Référence fabricantXM19-315131S000000
26,37 €
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400:5 50mm Base Mounted - - - - - - - - - 86 x 45 x 110 mm -
N° de stock RS 886-2162
Référence fabricantXM19-285111S000000
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300:5 50mm Base Mounted - - - - - - - - - 86 x 45 x 110 mm -
N° de stock RS 136-6357
Référence fabricantXM07-175031S000000
10,71 €
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80:5 26mm - 70mm - 50mm - 80A 44.5mm 5 A - - 50 x 44.5 x 70 mm -
N° de stock RS 886-2193
Référence fabricantXM19-405151S000000
27,61 €
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1200:5 50mm Base Mounted - - - - - - - - - 86 x 45 x 110 mm -
N° de stock RS 136-6358
Référence fabricantXM07-185051S000000
10,71 €
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100:5 26mm Window 70mm - 50mm - 100A 44.5mm 5 A - - 50 x 44.5 x 70 mm -
N° de stock RS 136-6368
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N° de stock RS 123-6735
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48,87 €
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400:5 80 x 50mm Clip Fit - - - - - - - - - 125 x 40 x 158 mm -
N° de stock RS 886-2196
Référence fabricantXM19-415151S000000
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N° de stock RS 123-6736
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48,87 €
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N° de stock RS 136-6359
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125:5 26mm - 70mm - 50mm - 125A 44.5mm 5 A - - 50 x 44.5 x 70 mm -
N° de stock RS 886-2231
Référence fabricantXM24-415151S000000
35,37 €
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1250:5 100mm Base Mounted - - - - - - - - - 140 x 45 x 155 mm -
N° de stock RS 123-6731
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38,79 €
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200:5 33 x 23mm Clip Fit - - - - - - - - - 93 x 40 x 106 mm -
N° de stock RS 136-6365
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28,71 €
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N° de stock RS 136-6363
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11,95 €
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N° de stock RS 886-2102
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19,24 €
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N° de stock RS 123-6722
Référence fabricantXN35-275031S000000
26,37 €
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250:5 31mm Base Mounted - - - - 250A - 5 A - - 105 x 38 x 87.5 mm MCCB
N° de stock RS 886-2229
Référence fabricantXM24-395135S000000
35,37 €
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1000:5 100mm Base Mounted - - - - - - - - - 140 x 45 x 155 mm -
N° de stock RS 886-2222
Référence fabricantXM20-435141S000000
28,55 €
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1600:5 60mm Base Mounted - - - - - - - - - 86 x 45 x 110 mm -