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 Bore Size Inner Diameter Transformer Type Overall Height Sensor Technology Overall Width Supply Voltage Input Current Overall Depth Output Current Minimum Temperature Maximum Temperature Dimensions
RS Stock No. 124-3879
BrandRS PRO
PHP70.78
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15:1 - - - - - - - 15A - - -40°C +120°C 17.2 x 9.53 x 20.4 mm
RS Stock No. 173-0041
BrandRS PRO
PHP59.325
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15:1 - - - - - - - 15A - - -40°C +120°C 17.2 x 9.53 x 20.4 mm
RS Stock No. 173-0184
BrandRS PRO
PHP287.038
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50:1 - - - - - - - 50A - - -40°C +120°C 32 x 20.5 x 35 mm
RS Stock No. 124-3883
BrandRS PRO
PHP317.01
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50:1 - - - - - - - 50A - - -40°C +120°C 32 x 20.5 x 35 mm
RS Stock No. 173-0045
BrandRS PRO
PHP142.149
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15:1 - - - - - - - 15A - - -40°C +120°C 17.2 x 9.53 x 20.4 mm
RS Stock No. 124-3898
BrandRS PRO
PHP117.82
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5:1 - - - - - - - 5A - - -40°C +120°C 17.2 x 9.53 x 20.4 mm
RS Stock No. 173-0219
BrandRS PRO
PHP511.107
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500:1 - - - - - - - 500A - - -55°C +130°C 55.6 x 20.6 x 55.6 mm
RS Stock No. 124-3881
BrandRS PRO
PHP133.14
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15:1 - - - - - - - 15A - - -40°C +120°C 17.2 x 9.53 x 20.4 mm
RS Stock No. 173-0215
BrandRS PRO
PHP106.135
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5:1 - - - - - - - 5A - - -40°C +120°C 17.2 x 9.53 x 20.4 mm
RS Stock No. 124-3895
BrandRS PRO
PHP564.16
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500:1 - - - - - - - 500A - - -55°C +130°C 55.6 x 20.6 x 55.6 mm
RS Stock No. 173-0201
BrandRS PRO
PHP155.288
Each (In a Box of 114)
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200:1 - - - - - - - 200A - - -55°C +130°C 38.1 x 15.9 x 38.1 mm
RS Stock No. 124-3901
BrandRS PRO
PHP135.00
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15:1 - - - - - - - 15A - - -40°C +120°C 17.2 x 9.53 x 20.4 mm
RS Stock No. 124-3900
BrandRS PRO
PHP218.15
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10:1 - - - - - - - 10A - - -40°C +120°C 17.2 x 9.53 x 20.4 mm
RS Stock No. 173-0235
BrandRS PRO
PHP197.358
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10:1 - - - - - - - 10A - - -40°C +120°C 17.2 x 9.53 x 20.4 mm
RS Stock No. 124-3892
BrandRS PRO
PHP172.54
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200:1 - - - - - - - 200A - - -55°C +130°C 38.1 x 15.9 x 38.1 mm
RS Stock No. 173-0236
BrandRS PRO
PHP105.227
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15:1 - - - - - - - 15A - - -40°C +120°C 17.2 x 9.53 x 20.4 mm
RS Stock No. 171-8787
BrandRS PRO
PHP711.79
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200:5 40 x 11mm - Clip Fit 78mm - 62mm - 200A 40mm 5 A -5°C +55°C 62 x 40 x 78 mm
RS Stock No. 171-8775
BrandRS PRO
PHP647.83
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300:5 30 x 10mm - Clip Fit 70mm - 50mm - 300A 31mm 5 A -5°C +55°C 50 x 31 x 70 mm
RS Stock No. 171-8797
BrandRS PRO
PHP1,060.27
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RS Stock No. 171-8856
BrandRS PRO
PHP1,049.00
Each
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10:5 62 x 40mm - Clip Fit 78mm - 62mm - 10A 40mm 5 A -5°C +55°C 62 x 40 x 78 mm