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. 173-0044
BrandRS PRO
MYR6.026
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. 124-3880
BrandRS PRO
MYR5.84
Each
units
- - - - - - 15A - -40°C +120°C 17.2 x 9.53 x 20.4 mm - PCB Mount -
RS Stock No. 124-3879
BrandRS PRO
MYR5.54
Each
units
- - - - - - 15A - -40°C +120°C 17.2 x 9.53 x 20.4 mm - PCB Mount -
RS Stock No. 124-3881
BrandRS PRO
MYR6.37
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
MYR6.437
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. 124-3893
BrandRS PRO
MYR16.48
Each
units
- - - - - - 75 → 200A - -55°C +130°C 38.1 x 15.9 x 38.1 mm - PCB Mount -
RS Stock No. 173-0217
BrandRS PRO
MYR109.944
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. 173-0041
BrandRS PRO
MYR5.615
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. 171-8790
BrandRS PRO
MYR119.84
Each
units
400:1 40 x 11mm - 78mm 62mm 40mm - - - - 62 x 40 x 78 mm - - -
RS Stock No. 171-8805
BrandRS PRO
MYR153.76
Each
units
1000:5 61 x 51mm Clip Fit 110mm 86mm 45mm 1kA 5 A -5°C +55°C 86 x 45 x 110 mm - Surface Mount -
RS Stock No. 171-8826
BrandRS PRO
MYR117.73
Each
units
150:5 35mm Base Mounted 87.5mm 105mm 38mm 150A 5 A - - 105 x 38 x 87.5 mm MCCB Surface Mount -
RS Stock No. 171-8776
BrandRS PRO
MYR101.65
Each
units
400:1 30 x 10mm - 70mm 50mm 30mm - - - - 50 x 30 x 70 mm - - -
RS Stock No. 171-8767
BrandRS PRO
MYR89.02
Each
units
- - - - - - - - - - - - - -
RS Stock No. 171-8797
BrandRS PRO
MYR119.84
Each
units
- - - - - - - - - - - - - -
RS Stock No. 171-8791
BrandRS PRO
MYR72.27
Each
units
400:5 40 x 11mm Clip Fit 78mm 62mm 40mm 400A 5 A -5°C +55°C 62 x 40 x 78 mm - Surface Mount -
RS Stock No. 171-8809
BrandRS PRO
MYR157.50
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. 124-3882
BrandRS PRO
MYR10.27
Each
units
- - - - - - 1 → 10A - -40°C +120°C 17.2 x 9.53 x 20.4 mm - PCB Mount -
RS Stock No. 171-8859
BrandRS PRO
MYR91.49
Each
units
30:5 62 x 40mm Clip Fit 78mm 62mm 40mm 30A 5 A -5°C +55°C 62 x 40 x 78 mm - Surface Mount -
RS Stock No. 171-8781
BrandRS PRO
MYR104.43
Each
units
100:5 30 x 11mm Clip Fit 78mm 62mm 40mm 100A 5 A -5°C +55°C 62 x 40 x 78 mm - Surface Mount -
RS Stock No. 171-8806
BrandRS PRO
MYR188.32
Each
units
1250:1 61 x 51mm - 110mm 86mm 45mm - - - - 86 x 45 x 110 mm - - -