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 Inner Diameter Transformer Type Overall Height Overall Width Overall Depth Input Current Output Current Minimum Temperature Maximum Temperature Dimensions For Use With Mounting Type Series
RS Stock No. 171-8818
BrandRS PRO
MYR216.78
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1500:5 100 x 30mm Clip Fit 155mm 140mm 45mm 1.5kA 5 A -5°C +55°C 140 x 45 x 155 mm - Surface Mount -
RS Stock No. 171-8827
BrandRS PRO
MYR121.26
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160:5 35mm Base Mounted 87.5mm 105mm 38mm 160A 5 A - - 105 x 38 x 87.5 mm MCCB Surface Mount -
RS Stock No. 171-8857
BrandRS PRO
MYR94.23
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15:5 62 x 40mm Clip Fit 78mm 62mm 40mm 15A 5 A -5°C +55°C 62 x 40 x 78 mm - Surface Mount -
RS Stock No. 171-8832
BrandRS PRO
MYR137.56
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400:5 45mm Base Mounted 102.5mm 141mm 38mm 400A 5 A - - 141 x 38 x 102.5 mm MCCB Surface Mount -
RS Stock No. 171-8778
BrandRS PRO
MYR60.28
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500:5 30 x 10mm Clip Fit 70mm 50mm 31mm 500A 5 A -5°C +55°C 50 x 31 x 70 mm - Surface Mount -
RS Stock No. 171-8758
BrandRS PRO
MYR63.84
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150:5 21 x 10mm Clip Fit 65mm 45mm 40mm 150A 5 A -5°C +55°C 45 x 40 x 65 mm - Surface Mount -
RS Stock No. 124-3895
BrandRS PRO
MYR50.93
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- - - - - - 200 500A - -55°C +130°C 55.6 x 20.6 x 55.6 mm - PCB Mount -
RS Stock No. 124-3903
BrandRS PRO
MYR22.73
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- - - - - - 10 20A - -40°C +85°C 17.2 x 9.53 x 20.4 mm - PCB Mount -
RS Stock No. 124-3889
BrandRS PRO
MYR14.44
Each
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- - - - - - 30 75A - -55°C +130°C 30.2 x 14.3 x 30.2 mm - PCB Mount -
RS Stock No. 124-3887
BrandRS PRO
MYR64.91
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- - - - - - 20 60A - -55°C +130°C 23.8 x 11.12 x 23.8 mm - PCB Mount -
RS Stock No. 171-8812
BrandRS PRO
MYR190.45
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1000:5 80 x 12mm Clip Fit 126mm 104mm 45mm 1kA 5 A -5°C +55°C 104 x 45 x 126 mm - Surface Mount -
RS Stock No. 171-8829
BrandRS PRO
MYR121.26
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250:5 35mm Base Mounted 87.5mm 105mm 38mm 250A 5 A - - 105 x 38 x 87.5 mm MCCB Surface Mount -
RS Stock No. 171-8793
BrandRS PRO
MYR123.44
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400:1 40 x 11mm - 78mm 62mm 40mm - - - - 62 x 40 x 78 mm - - -
RS Stock No. 171-8817
BrandRS PRO
MYR229.24
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2000:5 80 x 12mm Clip Fit 126mm 104mm 45mm 2kA 5 A -5°C +55°C 104 x 45 x 126 mm - Surface Mount -
RS Stock No. 124-3885
BrandRS PRO
MYR55.18
Each
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- - - - - - 10 60A - -55°C +130°C 23.8 x 11.12 x 23.8 mm - PCB Mount -
RS Stock No. 171-8756
BrandRS PRO
MYR63.84
Each
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125:5 21 x 10mm Clip Fit 65mm 45mm 40mm 125A 5 A -5°C +55°C 45 x 40 x 65 mm - Surface Mount -
RS Stock No. 171-8856
BrandRS PRO
MYR94.23
Each
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10:5 62 x 40mm Clip Fit 78mm 62mm 40mm 10A 5 A -5°C +55°C 62 x 40 x 78 mm - Surface Mount -
RS Stock No. 171-8839
BrandRS PRO
MYR493.74
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2500:5 38 x 128mm Base Mounted 170mm 99mm 45mm 2.5kA 5 A -5°C +55°C 99 x 45 x 170 mm - Surface Mount -
RS Stock No. 171-8791
BrandRS PRO
MYR74.44
Each
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400:5 40 x 11mm Clip Fit 78mm 62mm 40mm 400A 5 A -5°C +55°C 62 x 40 x 78 mm - Surface Mount -
RS Stock No. 171-8826
BrandRS PRO
MYR121.26
Each
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150:5 35mm Base Mounted 87.5mm 105mm 38mm 150A 5 A - - 105 x 38 x 87.5 mm MCCB Surface Mount -
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