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. 171-8850
BrandRS PRO
MYR206.36
Each
units
300:5 33 x 23mm Base Mounted 106mm 93mm 40mm 300A 5 A +20°C +70°C 93 x 40 x 106 mm - Surface Mount -
RS Stock No. 124-3900
BrandRS PRO
MYR19.69
Each
units
- - - - - - 10A - -40°C +120°C 17.2 x 9.53 x 20.4 mm - PCB Mount -
RS Stock No. 171-8767
BrandRS PRO
MYR91.69
Each
units
- - - - - - - - - - - - - -
RS Stock No. 171-8837
BrandRS PRO
MYR423.21
Each
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1600:5 38 x 128mm Base Mounted 170mm 99mm 45mm 1.6kA 5 A -5°C +55°C 99 x 45 x 170 mm - Surface Mount -
RS Stock No. 171-8827
BrandRS PRO
MYR121.26
Each
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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. 171-8817
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. 171-8854
BrandRS PRO
MYR254.51
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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 -
RS Stock No. 171-8786
BrandRS PRO
MYR71.42
Each
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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 -
RS Stock No. 171-8766
BrandRS PRO
MYR57.53
Each
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125:5 30 x 10mm Clip Fit 70mm 50mm 31mm 125A 5 A -5°C +55°C 50 x 31 x 70 mm - Surface Mount -
RS Stock No. 171-8765
BrandRS PRO
MYR57.53
Each
units
100:5 30 x 10mm Clip Fit 70mm 50mm 31mm 100A 5 A -5°C +55°C 50 x 31 x 70 mm - Surface Mount -
RS Stock No. 171-8824
BrandRS PRO
MYR121.26
Each
units
100:5 35mm Base Mounted 87.5mm 105mm 38mm 100A 5 A - - 105 x 38 x 87.5 mm MCCB Surface Mount -
RS Stock No. 171-8783
BrandRS PRO
MYR110.43
Each
units
150:5 30 x 11mm Clip Fit 78mm 62mm 40mm 150A 5 A -5°C +55°C 62 x 40 x 78 mm - Surface Mount -
RS Stock No. 171-8797
BrandRS PRO
MYR123.44
Each
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- - - - - - - - - - - - - -
RS Stock No. 171-8761
BrandRS PRO
MYR63.84
Each
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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 -
RS Stock No. 171-8844
BrandRS PRO
MYR458.47
Each
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2000:5 101 x 56mm Clip Fit 170mm 130mm 60mm 2kA 5 A -5°C +55°C 130 x 60 x 170 mm - Surface Mount -
RS Stock No. 124-3898
BrandRS PRO
MYR12.88
Each
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- - - - - - 5A - -40°C +120°C 17.2 x 9.53 x 20.4 mm - PCB Mount -
RS Stock No. 171-8833
BrandRS PRO
MYR137.56
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600:5 45mm Base Mounted 102.5mm 141mm 38mm 600A 5 A - - 141 x 38 x 102.5 mm MCCB Surface Mount -
RS Stock No. 171-8802
BrandRS PRO
MYR166.86
Each
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800:5 41 x 41mm Clip Fit 98mm 74mm 45mm 800A 5 A -5°C +55°C 74 x 45 x 98 mm - Surface Mount -
RS Stock No. 124-3891
BrandRS PRO
MYR15.10
Each
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- - - - - - 50 125A - -55°C +130°C 34.9 x 14.3 x 34.9 mm - PCB Mount -
RS Stock No. 171-8849
BrandRS PRO
MYR199.49
Each
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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 -
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