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 Input Current Overall Depth Output Current Minimum Temperature Maximum Temperature Dimensions For Use With Mounting Type Priced to Clear
RS Stock No. 173-0238
BrandRS PRO
£2.192
Each (In a Box of 220)
Units
- - - - - 50A - - -40°C +85°C 23.8 x 11.12 x 23.8 mm - PCB Mount -
RS Stock No. 171-8824
BrandRS PRO
£19.10
Each
Units
100:5 35mm Base Mounted 87.5mm 105mm 100A 38mm 5 A - - 105 x 38 x 87.5 mm MCCB Surface Mount -
RS Stock No. 171-8761
BrandRS PRO
£9.44
Each
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250:5 21 x 10mm Clip Fit 65mm 45mm 250A 40mm 5 A -5°C +55°C 45 x 40 x 65 mm - Surface Mount -
RS Stock No. 171-8825
BrandRS PRO
£19.10
Each
Units
125:5 35mm Base Mounted 87.5mm 105mm 125A 38mm 5 A - - 105 x 38 x 87.5 mm MCCB Surface Mount -
RS Stock No. 171-8762
BrandRS PRO
£9.44
Each
Units
300:5 21 x 10mm Clip Fit 65mm 45mm 300A 40mm 5 A -5°C +55°C 45 x 40 x 65 mm - Surface Mount -
RS Stock No. 171-8817
BrandRS PRO
£29.21
Each
Units
2000:5 80 x 12mm Clip Fit 126mm 104mm 2kA 45mm 5 A -5°C +55°C 104 x 45 x 126 mm - Surface Mount -
RS Stock No. 171-8826
BrandRS PRO
£19.10
Each
Units
150:5 35mm Base Mounted 87.5mm 105mm 150A 38mm 5 A - - 105 x 38 x 87.5 mm MCCB Surface Mount -
RS Stock No. 171-8766
BrandRS PRO
£7.75
Each
Units
125:5 30 x 10mm Clip Fit 70mm 50mm 125A 31mm 5 A -5°C +55°C 50 x 31 x 70 mm - Surface Mount -
RS Stock No. 171-8750
BrandRS PRO
£8.88
Each
Units
50:5 21 x 10mm Clip Fit 65mm 45mm 50A 40mm 5 A -5°C +55°C 45 x 40 x 65 mm - Surface Mount -
RS Stock No. 171-8763
BrandRS PRO
£7.75
Each
Units
80:5 30 x 10mm Clip Fit 70mm 50mm 80A 31mm 5 A -5°C +55°C 50 x 31 x 70 mm - Surface Mount -
RS Stock No. 171-8839
BrandRS PRO
£62.92
Each
Units
2500:5 38 x 128mm Base Mounted 170mm 99mm 2.5kA 45mm 5 A -5°C +55°C 99 x 45 x 170 mm - Surface Mount -
RS Stock No. 171-8776
BrandRS PRO
£13.37
Each
Units
400:1 30 x 10mm - 70mm 50mm - 30mm - - - 50 x 30 x 70 mm - - -
RS Stock No. 171-8859
BrandRS PRO
£13.93
Each
Units
30:5 62 x 40mm Clip Fit 78mm 62mm 30A 40mm 5 A -5°C +55°C 62 x 40 x 78 mm - Surface Mount -
RS Stock No. 171-8791
BrandRS PRO
£11.01
Each
Units
400:5 40 x 11mm Clip Fit 78mm 62mm 400A 40mm 5 A -5°C +55°C 62 x 40 x 78 mm - Surface Mount -
RS Stock No. 171-8818
BrandRS PRO
£27.42
Each
Units
1500:5 100 x 30mm Clip Fit 155mm 140mm 1.5kA 45mm 5 A -5°C +55°C 140 x 45 x 155 mm - Surface Mount -
RS Stock No. 171-8844
BrandRS PRO
£28.60
Each
Units
2000:5 101 x 56mm Clip Fit 170mm 130mm 2kA 60mm 5 A -5°C +55°C 130 x 60 x 170 mm - Surface Mount -
RS Stock No. 171-8833
BrandRS PRO
£22.47
Each
Units
600:5 45mm Base Mounted 102.5mm 141mm 600A 38mm 5 A - - 141 x 38 x 102.5 mm MCCB Surface Mount -
RS Stock No. 171-8785
BrandRS PRO
£10.56
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Units
100:5 40 x 11mm Clip Fit 78mm 62mm 100A 40mm 5 A -5°C +55°C 62 x 40 x 78 mm - Surface Mount -
RS Stock No. 171-8827
BrandRS PRO
£19.10
Each
Units
160:5 35mm Base Mounted 87.5mm 105mm 160A 38mm 5 A - - 105 x 38 x 87.5 mm MCCB Surface Mount -
RS Stock No. 171-8767
BrandRS PRO
£11.80
Each
Units
- - - - - - - - - - - - - -
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