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. 124-3880
BrandRS PRO
MYR7.07
Each
units
- - - - - - 15A - -40°C +120°C 17.2 x 9.53 x 20.4 mm - PCB Mount -
RS Stock No. 173-0044
BrandRS PRO
MYR6.207
Each (In a Box of 351)
units
- - - - - - 15A - -40°C +120°C 17.2 x 9.53 x 20.4 mm - PCB Mount -
RS Stock No. 124-3879
BrandRS PRO
MYR7.07
Each
units
- - - - - - 15A - -40°C +120°C 17.2 x 9.53 x 20.4 mm - PCB Mount -
RS Stock No. 173-0045
BrandRS PRO
MYR12.312
Each (In a Box of 351)
units
- - - - - - 15A - -40°C +120°C 17.2 x 9.53 x 20.4 mm - PCB Mount -
RS Stock No. 173-0217
BrandRS PRO
MYR113.243
Each (In a Box of 114)
units
- - - - - - 75 → 200A - -55°C +130°C 38.1 x 15.9 x 38.1 mm - PCB Mount -
RS Stock No. 124-3881
BrandRS PRO
MYR13.61
Each
units
- - - - - - 15A - -40°C +120°C 17.2 x 9.53 x 20.4 mm - PCB Mount -
RS Stock No. 124-3893
BrandRS PRO
MYR30.19
Each
units
- - - - - - 75 200A - -55°C +130°C 38.1 x 15.9 x 38.1 mm - PCB Mount -
RS Stock No. 173-0041
BrandRS PRO
MYR5.784
Each (In a Box of 351)
units
- - - - - - 15A - -40°C +120°C 17.2 x 9.53 x 20.4 mm - PCB Mount -
RS Stock No. 171-8841
BrandRS PRO
MYR373.83
Each
units
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 -
RS Stock No. 171-8769
BrandRS PRO
MYR57.53
Each
units
150:5 30 x 10mm Clip Fit 70mm 50mm 31mm 150A 5 A -5°C +55°C 50 x 31 x 70 mm - Surface Mount -
RS Stock No. 124-3895
BrandRS PRO
MYR57.70
Each
units
- - - - - - 200 500A - -55°C +130°C 55.6 x 20.6 x 55.6 mm - PCB Mount -
RS Stock No. 171-8837
BrandRS PRO
MYR423.21
Each
units
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. 171-8854
BrandRS PRO
MYR271.10
Each
units
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. 171-8815
BrandRS PRO
MYR202.79
Each
units
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 -
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. 173-0200
BrandRS PRO
MYR101.482
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. 171-8806
BrandRS PRO
MYR193.97
Each
units
1250:1 61 x 51mm - 110mm 86mm 45mm - - - - 86 x 45 x 110 mm - - -
RS Stock No. 171-8759
BrandRS PRO
MYR105.80
Each
units
200:1 21 x 10mm - 65mm 45mm 40mm - - - - 45 x 40 x 65 mm - - -
RS Stock No. 171-8772
BrandRS PRO
MYR96.98
Each
units
250:1 30 x 10mm - 70mm 50mm 30mm - - - - 50 x 30 x 70 mm - - -
RS Stock No. 171-8762
BrandRS PRO
MYR63.84
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 -
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