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 Input Current Overall Depth Output Current Minimum Temperature Maximum Temperature Dimensions For Use With Mounting Type Series
RS Stock No. 173-0199
BrandRS PRO
kr 25,759
Each (In a Box of 133)
Units
- - - - - 40 → 125A - - -55°C +130°C 34.9 x 14.3 x 34.9 mm - PCB Mount -
RS Stock No. 124-3889
BrandRS PRO
kr 41,67
Each
Units
- - - - - 30 → 75A - - -55°C +130°C 30.2 x 14.3 x 30.2 mm - PCB Mount -
RS Stock No. 173-0219
BrandRS PRO
kr 85,049
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. 124-3895
BrandRS PRO
kr 93,92
Each
Units
- - - - - 200 → 500A - - -55°C +130°C 55.6 x 20.6 x 55.6 mm - PCB Mount -
RS Stock No. 173-0198
BrandRS PRO
kr 37,858
Each (In a Box of 176)
Units
- - - - - 30 → 75A - - -55°C +130°C 30.2 x 14.3 x 30.2 mm - PCB Mount -
RS Stock No. 124-3890
BrandRS PRO
kr 28,71
Each
Units
- - - - - 40 → 125A - - -55°C +130°C 34.9 x 14.3 x 34.9 mm - PCB Mount -
RS Stock No. 171-8784
BrandRS PRO
kr 195,31
Each
Units
300:5 30 x 11mm Clip Fit 78mm 62mm 300A 40mm 5 A -5°C +55°C 62 x 40 x 78 mm - Surface Mount -
RS Stock No. 124-3893
BrandRS PRO
kr 49,15
Each
Units
- - - - - 75 → 200A - - -55°C +130°C 38.1 x 15.9 x 38.1 mm - PCB Mount -
RS Stock No. 171-8805
BrandRS PRO
kr 271,08
Each
Units
1000:5 61 x 51mm Clip Fit 110mm 86mm 1kA 45mm 5 A -5°C +55°C 86 x 45 x 110 mm - Surface Mount -
RS Stock No. 171-8788
BrandRS PRO
kr 142,37
Each
Units
250:5 40 x 11mm Clip Fit 78mm 62mm 250A 40mm 5 A -5°C +55°C 62 x 40 x 78 mm - Surface Mount -
RS Stock No. 171-8785
BrandRS PRO
kr 142,37
Each
Units
100:5 40 x 11mm Clip Fit 78mm 62mm 100A 40mm 5 A -5°C +55°C 62 x 40 x 78 mm - Surface Mount -
RS Stock No. 171-8847
BrandRS PRO
kr 378,76
Each
Units
150:5 33 x 23mm Base Mounted 106mm 93mm 150A 40mm 5 A +20°C +70°C 93 x 40 x 106 mm - Surface Mount -
RS Stock No. 171-8802
BrandRS PRO
kr 286,24
Each
Units
800:5 41 x 41mm Clip Fit 98mm 74mm 800A 45mm 5 A -5°C +55°C 74 x 45 x 98 mm - Surface Mount -
RS Stock No. 173-0200
BrandRS PRO
kr 18,202
Each (In a Box of 133)
Units
- - - - - 50 → 125A - - -55°C +130°C 34.9 x 14.3 x 34.9 mm - PCB Mount -
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. 171-8822
BrandRS PRO
kr 430,11
Each
Units
2500:5 100 x 30mm Clip Fit 155mm 140mm 2.5kA 45mm 5 A -5°C +55°C 140 x 45 x 155 mm - Surface Mount -
RS Stock No. 171-8782
BrandRS PRO
kr 186,34
Each
Units
125:5 30 x 11mm Clip Fit 78mm 62mm 125A 40mm 5 A -5°C +55°C 62 x 40 x 78 mm - Surface Mount -
RS Stock No. 171-8852
BrandRS PRO
kr 560,41
Each
Units
500:5 55 x 43mm Base Mounted 125mm 108mm 500A 51mm 5 A +20°C +70°C 108 x 51 x 125 mm - Surface Mount -
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. 171-8815
BrandRS PRO
kr 348,45
Each
Units
1500:5 80 x 12mm Clip Fit 126mm 104mm 1.5kA 45mm 5 A -5°C +55°C 104 x 45 x 126 mm - Surface Mount -
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