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. 173-0200
BrandRS PRO
SGD32.516
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. 171-8836
BrandRS PRO
SGD104.34
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. 171-8808
BrandRS PRO
SGD47.91
Each
units
1500:1 61 x 51mm - 110mm 86mm 45mm - - - - 86 x 45 x 110 mm - - -
RS Stock No. 171-8766
BrandRS PRO
SGD15.03
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. 171-8801
BrandRS PRO
SGD40.30
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. 171-8833
BrandRS PRO
SGD43.56
Each
units
600:5 45mm Base Mounted 102.5mm 141mm 38mm 600A 5 A - - 141 x 38 x 102.5 mm MCCB Surface Mount -
RS Stock No. 171-8781
BrandRS PRO
SGD26.79
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 -
RS Stock No. 171-8851
BrandRS PRO
SGD67.53
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. 173-0238
BrandRS PRO
SGD4.393
Each (In a Box of 220)
units
- - - - - - 50A - -40°C +85°C 23.8 x 11.12 x 23.8 mm - PCB Mount -
RS Stock No. 171-8770
BrandRS PRO
SGD23.31
Each
units
200:1 30 x 10mm - 70mm 50mm 30mm - - - - 50 x 30 x 70 mm - - -
RS Stock No. 171-8802
BrandRS PRO
SGD41.16
Each
units
800:5 41 x 41mm Clip Fit 98mm 74mm 45mm 800A 5 A -5°C +55°C 74 x 45 x 98 mm - Surface Mount -
RS Stock No. 171-8797
BrandRS PRO
SGD30.50
Each
units
- - - - - - - - - - - - - -
RS Stock No. 171-8787
BrandRS PRO
SGD21.16
Each
units
200:5 40 x 11mm Clip Fit 78mm 62mm 40mm 200A 5 A -5°C +55°C 62 x 40 x 78 mm - Surface Mount -
RS Stock No. 171-8816
BrandRS PRO
SGD52.28
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. 173-0217
BrandRS PRO
SGD8.161
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. 124-3889
BrandRS PRO
SGD7.21
Each
units
- - - - - - 30 → 75A - -55°C +130°C 30.2 x 14.3 x 30.2 mm - PCB Mount -
RS Stock No. 171-8757
BrandRS PRO
SGD27.01
Each
units
- - - - - - - - - - - - - -
RS Stock No. 171-8852
BrandRS PRO
SGD80.60
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. 171-8759
BrandRS PRO
SGD26.13
Each
units
200:1 21 x 10mm - 65mm 45mm 40mm - - - - 45 x 40 x 65 mm - - -
RS Stock No. 173-0045
BrandRS PRO
SGD3.66
Each (In a Box of 351)
units
- - - - - - 15A - -40°C +120°C 17.2 x 9.53 x 20.4 mm - PCB Mount -
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