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. 171-8806
BrandRS PRO
kr 333,30
Each
Units
1250:1 61 x 51mm - 110mm 86mm 45mm - - - - 86 x 45 x 110 mm - - -
RS Stock No. 173-0197
BrandRS PRO
kr 39,828
Each (In a Box of 176)
Units
- - - - - - 25 → 75A - -55°C +130°C 30.2 x 14.3 x 30.2 mm - PCB Mount -
RS Stock No. 171-8773
BrandRS PRO
kr 110,47
Each
Units
250:5 30 x 10mm Clip Fit 70mm 50mm 31mm 250A 5 A -5°C +55°C 50 x 31 x 70 mm - Surface Mount -
RS Stock No. 171-8776
BrandRS PRO
kr 180,16
Each
Units
400:1 30 x 10mm - 70mm 50mm 30mm - - - - 50 x 30 x 70 mm - - -
RS Stock No. 171-8777
BrandRS PRO
kr 122,53
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 -
RS Stock No. 171-8823
BrandRS PRO
kr 497,00
Each
Units
3000:5 100 x 30mm Clip Fit 155mm 140mm 45mm 3kA 5 A -5°C +55°C 140 x 45 x 155 mm - Surface Mount -
RS Stock No. 171-8766
BrandRS PRO
kr 104,59
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. 124-3894
BrandRS PRO
kr 18,96
Each
Units
- - - - - - 100 → 250A - -55°C +130°C 44.5 x 14.3 x 44.5 mm - PCB Mount -
RS Stock No. 124-3888
BrandRS PRO
kr 41,48
Each
Units
- - - - - - 25 → 75A - -55°C +130°C 30.2 x 14.3 x 30.2 mm - PCB Mount -
RS Stock No. 124-3899
BrandRS PRO
kr 34,00
Each
Units
- - - - - - 7.5A - -40°C +120°C 17.2 x 9.53 x 20.4 mm - PCB Mount -
RS Stock No. 171-8772
BrandRS PRO
kr 165,20
Each
Units
250:1 30 x 10mm - 70mm 50mm 30mm - - - - 50 x 30 x 70 mm - - -
RS Stock No. 171-8852
BrandRS PRO
kr 560,41
Each
Units
500:5 55 x 43mm Base Mounted 125mm 108mm 51mm 500A 5 A +20°C +70°C 108 x 51 x 125 mm - Surface Mount -
RS Stock No. 173-0216
BrandRS PRO
kr 30,945
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. 171-8827
BrandRS PRO
kr 257,43
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. 173-0217
BrandRS PRO
kr 47,099
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. 124-3897
BrandRS PRO
kr 35,79
Each
Units
- - - - - - 50A - -40°C +85°C 19 x 11.5 x 21.5 mm - PCB Mount -
RS Stock No. 171-8840
BrandRS PRO
kr 592,32
Each
Units
1000:5 101 x 56mm Clip Fit 170mm 130mm 60mm 1kA 5 A -5°C +55°C 130 x 60 x 170 mm - Surface Mount -
RS Stock No. 171-8839
BrandRS PRO
kr 848,25
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. 173-0182
BrandRS PRO
kr 35,671
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. 171-8781
BrandRS PRO
kr 186,34
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 -