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 Transformer Type Sensor Technology Supply Voltage Input Current Output Current Overall Height Minimum Temperature Overall Width Maximum Temperature Overall Depth Dimensions For Use With
RS Stock No. 124-3880
BrandRS PRO
MYR7.21
Each
units
15:1 - - - - 15A - - -40°C - +120°C - 17.2 x 9.53 x 20.4 mm -
RS Stock No. 173-0044
BrandRS PRO
MYR6.345
Each (In a Box of 351)
units
15:1 - - - - 15A - - -40°C - +120°C - 17.2 x 9.53 x 20.4 mm -
RS Stock No. 124-3881
BrandRS PRO
MYR11.85
Each
units
15:1 - - - - 15A - - -40°C - +120°C - 17.2 x 9.53 x 20.4 mm -
RS Stock No. 124-3893
BrandRS PRO
MYR26.29
Each
units
200:1 - - - - 200A - - -55°C - +130°C - 38.1 x 15.9 x 38.1 mm -
RS Stock No. 173-0045
BrandRS PRO
MYR10.722
Each (In a Box of 351)
units
15:1 - - - - 15A - - -40°C - +120°C - 17.2 x 9.53 x 20.4 mm -
RS Stock No. 173-0041
BrandRS PRO
MYR5.912
Each (In a Box of 351)
units
15:1 - - - - 15A - - -40°C - +120°C - 17.2 x 9.53 x 20.4 mm -
RS Stock No. 124-3879
BrandRS PRO
MYR6.30
Each
units
15:1 - - - - 15A - - -40°C - +120°C - 17.2 x 9.53 x 20.4 mm -
RS Stock No. 173-0217
BrandRS PRO
MYR23.905
Each (In a Box of 114)
units
200:1 - - - - 200A - - -55°C - +130°C - 38.1 x 15.9 x 38.1 mm -
RS Stock No. 171-8813
BrandRS PRO
MYR128.60
Each
units
1200:5 80 x 12mm Clip Fit - - 1200A 5 A 126mm -5°C 104mm +55°C 45mm 104 x 45 x 126 mm -
RS Stock No. 171-8790
BrandRS PRO
MYR91.37
Each
units
400:1 40 x 11mm - - - - - 78mm - 62mm - 40mm 62 x 40 x 78 mm -
RS Stock No. 171-8797
BrandRS PRO
MYR91.37
Each
units
- - - - - - - - - - - - - -
RS Stock No. 124-3883
BrandRS PRO
MYR26.39
Each
units
50:1 - - - - 50A - - -40°C - +120°C - 32 x 20.5 x 35 mm -
RS Stock No. 171-8844
BrandRS PRO
MYR377.01
Each
units
2000:5 101 x 56mm Clip Fit - - 2000A 5 A 170mm -5°C 130mm +55°C 60mm 130 x 60 x 170 mm -
RS Stock No. 171-8779
BrandRS PRO
MYR62.66
Each
units
600:5 30 x 10mm Clip Fit - - 600A 5 A 70mm -5°C 50mm +55°C 31mm 50 x 31 x 70 mm -
RS Stock No. 171-8772
BrandRS PRO
MYR71.14
Each
units
250:1 30 x 10mm - - - - - 70mm - 50mm - 30mm 50 x 30 x 70 mm -
RS Stock No. 173-0181
BrandRS PRO
MYR14.87
Each (In a Box of 351)
units
10:1 - - - - 10A - - -40°C - +120°C - 17.2 x 9.53 x 20.4 mm -
RS Stock No. 171-8834
BrandRS PRO
MYR255.14
Each
units
1000:5 38 x 128mm Base Mounted - - 1000A 5 A 170mm -5°C 99mm +55°C 45mm 99 x 45 x 170 mm -
RS Stock No. 171-8769
BrandRS PRO
MYR45.03
Each
units
150:5 30 x 10mm Clip Fit - - 150A 5 A 70mm -5°C 50mm +55°C 31mm 50 x 31 x 70 mm -
RS Stock No. 171-8763
BrandRS PRO
MYR45.03
Each
units
80:5 30 x 10mm Clip Fit - - 80A 5 A 70mm -5°C 50mm +55°C 31mm 50 x 31 x 70 mm -
RS Stock No. 173-0237
BrandRS PRO
MYR23.17
Each (In a Box of 351)
units
120:1 - - - - 120A - - -40°C - +85°C - 17.2 x 9.53 x 20.4 mm -