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 124-3900
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3,64 €
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- - - - - - 10A - -40°C +120°C 17.2 x 9.53 x 20.4 mm - PCB Mount -
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3,474 €
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N° de stock RS 171-8749
MarqueRS PRO
17,47 €
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50:1 21 x 10mm - 65mm 45mm 40mm - - - - 45 x 40 x 65 mm - - -
N° de stock RS 171-8750
MarqueRS PRO
12,01 €
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N° de stock RS 171-8760
MarqueRS PRO
12,76 €
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200:5 21 x 10mm Clip Fit 65mm 45mm 40mm 200A 5 A -5°C +55°C 45 x 40 x 65 mm - Surface Mount -
N° de stock RS 171-8815
MarqueRS PRO
34,95 €
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1500:5 80 x 12mm Clip Fit 126mm 104mm 45mm 1.5kA 5 A -5°C +55°C 104 x 45 x 126 mm - Surface Mount -
N° de stock RS 171-8854
MarqueRS PRO
56,21 €
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600:5 55 x 43mm Base Mounted 125mm 108mm 51mm 600A 5 A +20°C +70°C 108 x 51 x 125 mm - Surface Mount -
N° de stock RS 171-8751
MarqueRS PRO
12,01 €
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60:5 21 x 10mm Clip Fit 65mm 45mm 40mm 60A 5 A -5°C +55°C 45 x 40 x 65 mm - Surface Mount -
N° de stock RS 171-8822
MarqueRS PRO
43,14 €
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2500:5 100 x 30mm Clip Fit 155mm 140mm 45mm 2.5kA 5 A -5°C +55°C 140 x 45 x 155 mm - Surface Mount -
N° de stock RS 171-8811
MarqueRS PRO
31,13 €
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800:5 80 x 12mm Clip Fit 126mm 104mm 45mm 800A 5 A -5°C +55°C 104 x 45 x 126 mm - Surface Mount -
N° de stock RS 171-8761
MarqueRS PRO
12,76 €
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250:5 21 x 10mm Clip Fit 65mm 45mm 40mm 250A 5 A -5°C +55°C 45 x 40 x 65 mm - Surface Mount -
N° de stock RS 171-8841
MarqueRS PRO
62,45 €
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1250:5 101 x 56mm Clip Fit 170mm 130mm 60mm 1.25kA 5 A -5°C +55°C 130 x 60 x 170 mm - Surface Mount -
N° de stock RS 171-8855
MarqueRS PRO
18,84 €
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5:5 62 x 40mm Clip Fit 78mm 62mm 40mm 5A 5 A -5°C +55°C 62 x 40 x 78 mm - Surface Mount -
N° de stock RS 124-3882
MarqueRS PRO
3,58 €
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- - - - - - 1 → 10A - -40°C +120°C 17.2 x 9.53 x 20.4 mm - PCB Mount -
N° de stock RS 171-8849
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44,07 €
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250:5 33 x 23mm Base Mounted 106mm 93mm 40mm 250A 5 A +20°C +70°C 93 x 40 x 106 mm - Surface Mount -
N° de stock RS 171-8786
MarqueRS PRO
14,28 €
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150:5 40 x 11mm Clip Fit 78mm 62mm 40mm 150A 5 A -5°C +55°C 62 x 40 x 78 mm - Surface Mount -
N° de stock RS 171-8857
MarqueRS PRO
18,84 €
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N° de stock RS 171-8842
MarqueRS PRO
72,78 €
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1500:5 101 x 56mm Clip Fit 170mm 130mm 60mm 1.5kA 5 A -5°C +55°C 130 x 60 x 170 mm - Surface Mount -
N° de stock RS 124-3901
MarqueRS PRO
2,44 €
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- - - - - - 15A - -40°C +120°C 17.2 x 9.53 x 20.4 mm - PCB Mount -
N° de stock RS 171-8816
MarqueRS PRO
36,47 €
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1600:5 80 x 12mm Clip Fit 126mm 104mm 45mm 1.6kA 5 A -5°C +55°C 104 x 45 x 126 mm - Surface Mount -