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. 124-3888
BrandRS PRO
MYR14.44
Each
units
- - - - - - 25 → 75A - -55°C +130°C 30.2 x 14.3 x 30.2 mm - PCB Mount -
RS Stock No. 173-0215
BrandRS PRO
MYR113.243
Each (In a Box of 351)
units
- - - - - - 5A - -40°C +120°C 17.2 x 9.53 x 20.4 mm - PCB Mount -
RS Stock No. 171-8858
BrandRS PRO
MYR94.23
Each
units
20:5 62 x 40mm Clip Fit 78mm 62mm 40mm 20A 5 A -5°C +55°C 62 x 40 x 78 mm - Surface Mount -
RS Stock No. 171-8811
BrandRS PRO
MYR183.39
Each
units
800:5 80 x 12mm Clip Fit 126mm 104mm 45mm 800A 5 A -5°C +55°C 104 x 45 x 126 mm - Surface Mount -
RS Stock No. 171-8804
BrandRS PRO
MYR172.14
Each
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1000:5 41 x 41mm Clip Fit 98mm 74mm 45mm 1kA 5 A -5°C +55°C 74 x 45 x 98 mm - Surface Mount -
RS Stock No. 171-8826
BrandRS PRO
MYR121.26
Each
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150:5 35mm Base Mounted 87.5mm 105mm 38mm 150A 5 A - - 105 x 38 x 87.5 mm MCCB Surface Mount -
RS Stock No. 173-0219
BrandRS PRO
MYR125.823
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. 171-8832
BrandRS PRO
MYR137.56
Each
units
400:5 45mm Base Mounted 102.5mm 141mm 38mm 400A 5 A - - 141 x 38 x 102.5 mm MCCB Surface Mount -
RS Stock No. 171-8835
BrandRS PRO
MYR373.83
Each
units
1250:5 38 x 128mm Base Mounted 170mm 99mm 45mm 1.25kA 5 A -5°C +55°C 99 x 45 x 170 mm - Surface Mount -
RS Stock No. 171-8801
BrandRS PRO
MYR166.59
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. 173-0184
BrandRS PRO
MYR90.547
Each (In a Box of 98)
units
- - - - - - 5 → 50A - -40°C +120°C 32 x 20.5 x 35 mm - PCB Mount -
RS Stock No. 171-8757
BrandRS PRO
MYR105.80
Each
units
- - - - - - - - - - - - - -
RS Stock No. 124-3895
BrandRS PRO
MYR32.62
Each
units
- - - - - - 200 → 500A - -55°C +130°C 55.6 x 20.6 x 55.6 mm - PCB Mount -
RS Stock No. 173-0237
BrandRS PRO
MYR132.739
Each (In a Box of 351)
units
- - - - - - 10 → 20A - -40°C +85°C 17.2 x 9.53 x 20.4 mm - PCB Mount -
RS Stock No. 171-8815
BrandRS PRO
MYR202.79
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. 171-8821
BrandRS PRO
MYR215.88
Each
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2000:5 100 x 30mm Clip Fit 155mm 140mm 45mm 2kA 5 A -5°C +55°C 140 x 45 x 155 mm - Surface Mount -
RS Stock No. 124-3886
BrandRS PRO
MYR64.91
Each
units
- - - - - - 15 → 60A - -55°C +130°C 23.8 x 11.12 x 23.8 mm - PCB Mount -
RS Stock No. 173-0200
BrandRS PRO
MYR101.482
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. 171-8846
BrandRS PRO
MYR176.27
Each
units
100:5 33 x 23mm Base Mounted 106mm 93mm 40mm 100A 5 A +20°C +70°C 93 x 40 x 106 mm - Surface Mount -
RS Stock No. 171-8859
BrandRS PRO
MYR94.23
Each
units
30:5 62 x 40mm Clip Fit 78mm 62mm 40mm 30A 5 A -5°C +55°C 62 x 40 x 78 mm - Surface Mount -
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