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. 171-8858
BrandRS PRO
€17.52
Each
units
20:5 62 x 40mm Clip Fit 78mm 62mm 40mm 20A 5 A -5°C +55°C 62 x 40 x 78 mm - Surface Mount -
RS Stock No. 171-8827
BrandRS PRO
€24.02
Each
units
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. 171-8822
BrandRS PRO
€40.13
Each
units
2500:5 100 x 30mm Clip Fit 155mm 140mm 45mm 2.5kA 5 A -5°C +55°C 140 x 45 x 155 mm - Surface Mount -
RS Stock No. 124-3894
BrandRS PRO
€2.18
Each
units
- - - - - - 100 → 250A - -55°C +130°C 44.5 x 14.3 x 44.5 mm - PCB Mount -
RS Stock No. 171-8757
BrandRS PRO
€16.95
Each
units
- - - - - - - - - - - - - -
RS Stock No. 171-8834
BrandRS PRO
€55.25
Each
units
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 -
RS Stock No. 171-8818
BrandRS PRO
€34.48
Each
units
1500:5 100 x 30mm Clip Fit 155mm 140mm 45mm 1.5kA 5 A -5°C +55°C 140 x 45 x 155 mm - Surface Mount -
RS Stock No. 171-8751
BrandRS PRO
€11.17
Each
units
60:5 21 x 10mm Clip Fit 65mm 45mm 40mm 60A 5 A -5°C +55°C 45 x 40 x 65 mm - Surface Mount -
RS Stock No. 171-8794
BrandRS PRO
€13.85
Each
units
600:5 40 x 11mm Clip Fit 78mm 62mm 40mm 600A 5 A -5°C +55°C 62 x 40 x 78 mm - Surface Mount -
RS Stock No. 173-0182
BrandRS PRO
€3.578
Each (In a Box of 220)
units
- - - - - - 10 → 60A - -55°C +130°C 23.8 x 11.12 x 23.8 mm - PCB Mount -
RS Stock No. 171-8811
BrandRS PRO
€28.96
Each
units
800:5 80 x 12mm Clip Fit 126mm 104mm 45mm 800A 5 A -5°C +55°C 104 x 45 x 126 mm - Surface Mount -
RS Stock No. 171-8798
BrandRS PRO
€14.69
Each
units
800:5 40 x 11mm Clip Fit 78mm 62mm 40mm 800A 5 A -5°C +55°C 62 x 40 x 78 mm - Surface Mount -
RS Stock No. 171-8793
BrandRS PRO
€19.79
Each
units
400:1 40 x 11mm - 78mm 62mm 40mm - - - - 62 x 40 x 78 mm - - -
RS Stock No. 171-8810
BrandRS PRO
€26.00
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. 173-0201
BrandRS PRO
€2.451
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. 171-8843
BrandRS PRO
€68.54
Each
units
1600:5 101 x 56mm Clip Fit 170mm 130mm 60mm 1.6kA 5 A -5°C +55°C 130 x 60 x 170 mm - Surface Mount -
RS Stock No. 171-8766
BrandRS PRO
€9.75
Each
units
125:5 30 x 10mm Clip Fit 70mm 50mm 31mm 125A 5 A -5°C +55°C 50 x 31 x 70 mm - Surface Mount -
RS Stock No. 171-8839
BrandRS PRO
€79.13
Each
units
2500:5 38 x 128mm Base Mounted 170mm 99mm 45mm 2.5kA 5 A -5°C +55°C 99 x 45 x 170 mm - Surface Mount -
RS Stock No. 173-0219
BrandRS PRO
€8.996
Each (In a Box of 18)
units
- - - - - - 200 → 500A - -55°C +130°C 55.6 x 20.6 x 55.6 mm - PCB Mount -
RS Stock No. 171-8777
BrandRS PRO
€11.44
Each
units
400:5 30 x 10mm Clip Fit 70mm 50mm 31mm 400A 5 A -5°C +55°C 50 x 31 x 70 mm - Surface Mount -
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