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. 124-3897
BrandRS PRO
€3.55
Each
units
- - - - - - 50A - -40°C +85°C 19 x 11.5 x 21.5 mm - PCB Mount -
RS Stock No. 173-0181
BrandRS PRO
€2.939
Each (In a Box of 351)
units
- - - - - - 1 → 10A - -40°C +120°C 17.2 x 9.53 x 20.4 mm - PCB Mount -
RS Stock No. 173-0041
BrandRS PRO
€0.973
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. 173-0236
BrandRS PRO
€1.588
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. 124-3882
BrandRS PRO
€3.58
Each
units
- - - - - - 1 → 10A - -40°C +120°C 17.2 x 9.53 x 20.4 mm - PCB Mount -
RS Stock No. 124-3879
BrandRS PRO
€1.19
Each
units
- - - - - - 15A - -40°C +120°C 17.2 x 9.53 x 20.4 mm - PCB Mount -
RS Stock No. 124-3901
BrandRS PRO
€1.51
Each
units
- - - - - - 15A - -40°C +120°C 17.2 x 9.53 x 20.4 mm - PCB Mount -
RS Stock No. 171-8790
BrandRS PRO
€19.79
Each
units
400:1 40 x 11mm - 78mm 62mm 40mm - - - - 62 x 40 x 78 mm - - -
RS Stock No. 124-3885
BrandRS PRO
€3.34
Each
units
- - - - - - 10 → 60A - -55°C +130°C 23.8 x 11.12 x 23.8 mm - PCB Mount -
RS Stock No. 171-8816
BrandRS PRO
€33.92
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. 171-8791
BrandRS PRO
€13.85
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. 171-8800
BrandRS PRO
€25.71
Each
units
500:5 41 x 41mm Clip Fit 98mm 74mm 45mm 500A 5 A -5°C +55°C 74 x 45 x 98 mm - Surface Mount -
RS Stock No. 171-8792
BrandRS PRO
€13.85
Each
units
500:5 40 x 11mm Clip Fit 78mm 62mm 40mm 500A 5 A -5°C +55°C 62 x 40 x 78 mm - Surface Mount -
RS Stock No. 173-0235
BrandRS PRO
€3.474
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. 171-8797
BrandRS PRO
€19.79
Each
units
- - - - - - - - - - - - - -
RS Stock No. 171-8765
BrandRS PRO
€9.75
Each
units
100:5 30 x 10mm Clip Fit 70mm 50mm 31mm 100A 5 A -5°C +55°C 50 x 31 x 70 mm - Surface Mount -
RS Stock No. 171-8801
BrandRS PRO
€26.14
Each
units
600:5 41 x 41mm Clip Fit 98mm 74mm 45mm 600A 5 A -5°C +55°C 74 x 45 x 98 mm - Surface Mount -
RS Stock No. 171-8849
BrandRS PRO
€40.98
Each
units
250:5 33 x 23mm Base Mounted 106mm 93mm 40mm 250A 5 A +20°C +70°C 93 x 40 x 106 mm - Surface Mount -
RS Stock No. 171-8823
BrandRS PRO
€46.35
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. 171-8753
BrandRS PRO
€11.17
Each
units
80:5 21 x 10mm Clip Fit 65mm 45mm 40mm 80A 5 A -5°C +55°C 45 x 40 x 65 mm - Surface Mount -
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