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
MYR7.00
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
MYR6.163
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. 124-3881
BrandRS PRO
MYR13.47
Each
units
- - - - - - 15A - -40°C +120°C 17.2 x 9.53 x 20.4 mm - PCB Mount -
RS Stock No. 173-0041
BrandRS PRO
MYR5.743
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. 173-0045
BrandRS PRO
MYR12.184
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
MYR27.165
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. 124-3893
BrandRS PRO
MYR29.88
Each
units
- - - - - - 75 → 200A - -55°C +130°C 38.1 x 15.9 x 38.1 mm - PCB Mount -
RS Stock No. 124-3879
BrandRS PRO
MYR7.00
Each
units
- - - - - - 15A - -40°C +120°C 17.2 x 9.53 x 20.4 mm - PCB Mount -
RS Stock No. 171-8856
BrandRS PRO
MYR94.23
Each
units
10:5 62 x 40mm Clip Fit 78mm 62mm 40mm 10A 5 A -5°C +55°C 62 x 40 x 78 mm - Surface Mount -
RS Stock No. 173-0235
BrandRS PRO
MYR19.974
Each (In a Box of 351)
units
- - - - - - 10A - -40°C +120°C 17.2 x 9.53 x 20.4 mm - PCB Mount -
RS Stock No. 124-3902
BrandRS PRO
MYR16.28
Each
units
- - - - - - 50A - -40°C +85°C 23.8 x 11.12 x 23.8 mm - PCB Mount -
RS Stock No. 171-8857
BrandRS PRO
MYR92.92
Each
units
15:5 62 x 40mm Clip Fit 78mm 62mm 40mm 15A 5 A -5°C +55°C 62 x 40 x 78 mm - Surface Mount -
RS Stock No. 124-3889
BrandRS PRO
MYR14.44
Each
units
- - - - - - 30 → 75A - -55°C +130°C 30.2 x 14.3 x 30.2 mm - PCB Mount -
RS Stock No. 171-8841
BrandRS PRO
MYR297.96
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. 171-8825
BrandRS PRO
MYR124.56
Each
units
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. 171-8810
BrandRS PRO
MYR133.41
Each
units
1500:5 61 x 51mm Clip Fit 110mm 86mm 45mm 1.5kA 5 A -5°C +55°C 86 x 45 x 110 mm - Surface Mount -
RS Stock No. 173-0216
BrandRS PRO
MYR17.848
Each (In a Box of 351)
units
- - - - - - 7.5A - -40°C +120°C 17.2 x 9.53 x 20.4 mm - PCB Mount -
RS Stock No. 171-8779
BrandRS PRO
MYR69.62
Each
units
600:5 30 x 10mm Clip Fit 70mm 50mm 31mm 600A 5 A -5°C +55°C 50 x 31 x 70 mm - Surface Mount -
RS Stock No. 171-8831
BrandRS PRO
MYR146.53
Each
units
300:5 45mm Base Mounted 102.5mm 141mm 38mm 300A 5 A - - 141 x 38 x 102.5 mm MCCB Surface Mount -
RS Stock No. 171-8754
BrandRS PRO
MYR83.38
Each
units
100:1 21 x 10mm - 65mm 45mm 40mm - - - - 45 x 40 x 65 mm - - -