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. 173-0199
BrandRS PRO
€2.552
Each (In a Box of 133)
units
- - - - - - 40 → 125A - -55°C +130°C 34.9 x 14.3 x 34.9 mm - PCB Mount -
RS Stock No. 171-8794
BrandRS PRO
€13.85
Each
units
600:5 40 x 11mm Clip Fit 78mm 62mm 40mm 600A 5 A -5°C +55°C 62 x 40 x 78 mm - Surface Mount -
RS Stock No. 171-8762
BrandRS PRO
€11.87
Each
units
300:5 21 x 10mm Clip Fit 65mm 45mm 40mm 300A 5 A -5°C +55°C 45 x 40 x 65 mm - Surface Mount -
RS Stock No. 124-3896
BrandRS PRO
€3.32
Each
units
- - - - - - 25A - -40°C +85°C 19 x 11.5 x 21.5 mm - - -
RS Stock No. 171-8833
BrandRS PRO
€28.26
Each
units
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. 171-8825
BrandRS PRO
€24.02
Each
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125:5 35mm Base Mounted 87.5mm 105mm 38mm 125A 5 A - - 105 x 38 x 87.5 mm MCCB Surface Mount -
RS Stock No. 173-0237
BrandRS PRO
€4.029
Each (In a Box of 351)
units
- - - - - - 10 → 20A - -40°C +85°C 17.2 x 9.53 x 20.4 mm - PCB Mount -
RS Stock No. 171-8843
BrandRS PRO
€68.54
Each
units
1600:5 101 x 56mm Clip Fit 170mm 130mm 60mm 1.6kA 5 A -5°C +55°C 130 x 60 x 170 mm - Surface Mount -
RS Stock No. 124-3892
BrandRS PRO
€2.72
Each
units
- - - - - - 60 → 200A - -55°C +130°C 38.1 x 15.9 x 38.1 mm - PCB Mount -
RS Stock No. 171-8750
BrandRS PRO
€11.17
Each
units
50:5 21 x 10mm Clip Fit 65mm 45mm 40mm 50A 5 A -5°C +55°C 45 x 40 x 65 mm - Surface Mount -
RS Stock No. 171-8771
BrandRS PRO
€10.04
Each
units
200:5 30 x 10mm Clip Fit 70mm 50mm 31mm 200A 5 A -5°C +55°C 50 x 31 x 70 mm - Surface Mount -
RS Stock No. 171-8836
BrandRS PRO
€67.69
Each
units
1500:5 38 x 128mm Base Mounted 170mm 99mm 45mm 1.5kA 5 A -5°C +55°C 99 x 45 x 170 mm - Surface Mount -
RS Stock No. 171-8827
BrandRS PRO
€24.02
Each
units
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. 171-8787
BrandRS PRO
€13.29
Each
units
200:5 40 x 11mm Clip Fit 78mm 62mm 40mm 200A 5 A -5°C +55°C 62 x 40 x 78 mm - Surface Mount -
RS Stock No. 173-0200
BrandRS PRO
€1.257
Each (In a Box of 133)
units
- - - - - - 50 → 125A - -55°C +130°C 34.9 x 14.3 x 34.9 mm - PCB Mount -
RS Stock No. 124-3885
BrandRS PRO
€3.34
Each
units
- - - - - - 10 → 60A - -55°C +130°C 23.8 x 11.12 x 23.8 mm - PCB Mount -
RS Stock No. 124-3903
BrandRS PRO
€4.20
Each
units
- - - - - - 10 → 20A - -40°C +85°C 17.2 x 9.53 x 20.4 mm - PCB Mount -
RS Stock No. 173-0218
BrandRS PRO
€2.10
Each (In a Box of 25)
units
- - - - - - 100 → 250A - -55°C +130°C 44.5 x 14.3 x 44.5 mm - PCB Mount -
RS Stock No. 171-8763
BrandRS PRO
€9.75
Each
units
80:5 30 x 10mm Clip Fit 70mm 50mm 31mm 80A 5 A -5°C +55°C 50 x 31 x 70 mm - Surface Mount -
RS Stock No. 171-8854
BrandRS PRO
€52.29
Each
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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 -
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