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
SGD2.10
Each
units
- - - - - - 15A - -40°C +120°C 17.2 x 9.53 x 20.4 mm - PCB Mount -
RS Stock No. 173-0215
BrandRS PRO
SGD3.087
Each (In a Box of 351)
units
- - - - - - 5A - -40°C +120°C 17.2 x 9.53 x 20.4 mm - PCB Mount -
RS Stock No. 124-3898
BrandRS PRO
SGD3.43
Each
units
- - - - - - 5A - -40°C +120°C 17.2 x 9.53 x 20.4 mm - PCB Mount -
RS Stock No. 124-3896
BrandRS PRO
SGD6.01
Each
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- - - - - - 25A - -40°C +85°C 19 x 11.5 x 21.5 mm - - -
RS Stock No. 173-0044
BrandRS PRO
SGD1.989
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. 173-0220
BrandRS PRO
SGD36.284
Each (In a Box of 140)
units
- - - - - - 25A - -40°C +85°C 19 x 11.5 x 21.5 mm - - -
RS Stock No. 124-3879
BrandRS PRO
SGD2.10
Each
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- - - - - - 15A - -40°C +120°C 17.2 x 9.53 x 20.4 mm - PCB Mount -
RS Stock No. 124-3892
BrandRS PRO
SGD4.83
Each
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- - - - - - 60 200A - -55°C +130°C 38.1 x 15.9 x 38.1 mm - PCB Mount -
RS Stock No. 173-0237
BrandRS PRO
SGD50.037
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. 173-0181
BrandRS PRO
SGD27.272
Each (In a Box of 351)
units
- - - - - - 1 → 10A - -40°C +120°C 17.2 x 9.53 x 20.4 mm - PCB Mount -
RS Stock No. 124-3903
BrandRS PRO
SGD7.65
Each
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- - - - - - 10 20A - -40°C +85°C 17.2 x 9.53 x 20.4 mm - PCB Mount -
RS Stock No. 124-3882
BrandRS PRO
SGD6.19
Each
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- - - - - - 1 10A - -40°C +120°C 17.2 x 9.53 x 20.4 mm - PCB Mount -
RS Stock No. 173-0201
BrandRS PRO
SGD32.516
Each (In a Box of 114)
units
- - - - - - 60 → 200A - -55°C +130°C 38.1 x 15.9 x 38.1 mm - PCB Mount -
RS Stock No. 124-3897
BrandRS PRO
SGD6.29
Each
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- - - - - - 50A - -40°C +85°C 19 x 11.5 x 21.5 mm - PCB Mount -
RS Stock No. 173-0041
BrandRS PRO
SGD1.853
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. 171-8786
BrandRS PRO
SGD21.90
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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. 171-8838
BrandRS PRO
SGD144.62
Each
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2000:5 38 x 128mm Base Mounted 170mm 99mm 45mm 2kA 5 A -5°C +55°C 99 x 45 x 170 mm - Surface Mount -
RS Stock No. 171-8772
BrandRS PRO
SGD30.66
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250:1 30 x 10mm - 70mm 50mm 30mm - - - - 50 x 30 x 70 mm - - -
RS Stock No. 171-8827
BrandRS PRO
SGD37.29
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. 171-8834
BrandRS PRO
SGD109.10
Each
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1000:5 38 x 128mm Base Mounted 170mm 99mm 45mm 1kA 5 A -5°C +55°C 99 x 45 x 170 mm - Surface Mount -
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