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. 171-8758
BrandRS PRO
kr 127,22
Each
Units
150:5 21 x 10mm Clip Fit 65mm 45mm 40mm 150A 5 A -5°C +55°C 45 x 40 x 65 mm - Surface Mount -
RS Stock No. 171-8754
BrandRS PRO
kr 174,18
Each
Units
100:1 21 x 10mm - 65mm 45mm 40mm - - - - 45 x 40 x 65 mm - - -
RS Stock No. 173-0235
BrandRS PRO
kr 34,632
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. 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. 171-8816
BrandRS PRO
kr 363,61
Each
Units
1600:5 80 x 12mm Clip Fit 126mm 104mm 45mm 1.6kA 5 A -5°C +55°C 104 x 45 x 126 mm - Surface Mount -
RS Stock No. 171-8812
BrandRS PRO
kr 325,52
Each
Units
1000:5 80 x 12mm Clip Fit 126mm 104mm 45mm 1kA 5 A -5°C +55°C 104 x 45 x 126 mm - Surface Mount -
RS Stock No. 124-3896
BrandRS PRO
kr 33,50
Each
Units
- - - - - - 25A - -40°C +85°C 19 x 11.5 x 21.5 mm - - -
RS Stock No. 171-8790
BrandRS PRO
kr 211,96
Each
Units
400:1 40 x 11mm - 78mm 62mm 40mm - - - - 62 x 40 x 78 mm - - -
RS Stock No. 171-8815
BrandRS PRO
kr 348,45
Each
Units
1500:5 80 x 12mm Clip Fit 126mm 104mm 45mm 1.5kA 5 A -5°C +55°C 104 x 45 x 126 mm - Surface Mount -
RS Stock No. 171-8851
BrandRS PRO
kr 469,49
Each
Units
400:5 33 x 23mm Base Mounted 106mm 93mm 40mm 400A 5 A +20°C +70°C 93 x 40 x 106 mm - Surface Mount -
RS Stock No. 171-8808
BrandRS PRO
kr 333,30
Each
Units
1500:1 61 x 51mm - 110mm 86mm 45mm - - - - 86 x 45 x 110 mm - - -
RS Stock No. 171-8809
BrandRS PRO
kr 278,76
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. 124-3883
BrandRS PRO
kr 55,63
Each
Units
- - - - - - 5 → 50A - -40°C +120°C 32 x 20.5 x 35 mm - PCB Mount -
RS Stock No. 171-8836
BrandRS PRO
kr 725,62
Each
Units
1500:5 38 x 128mm Base Mounted 170mm 99mm 45mm 1.5kA 5 A -5°C +55°C 99 x 45 x 170 mm - Surface Mount -
RS Stock No. 171-8749
BrandRS PRO
kr 174,18
Each
Units
50:1 21 x 10mm - 65mm 45mm 40mm - - - - 45 x 40 x 65 mm - - -
RS Stock No. 171-8857
BrandRS PRO
kr 187,83
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. 171-8810
BrandRS PRO
kr 278,76
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. 171-8764
BrandRS PRO
kr 159,02
Each
Units
100:1 30 x 10mm - 70mm 50mm 30mm - - - - 50 x 30 x 70 mm - - -
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. 171-8860
BrandRS PRO
kr 237,68
Each
Units
40:5 74 x 45mm Clip Fit 98mm 74mm 45mm 40A 5 A -5°C +55°C 74 x 45 x 98 mm - Surface Mount -
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