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. 171-8779
BrandRS PRO
PHP766.38
Each
units
600:5 30 x 10mm Clip Fit 70mm 50mm 31mm 600A 5 A -5°C +55°C 50 x 31 x 70 mm - Surface Mount -
RS Stock No. 171-8789
BrandRS PRO
PHP773.02
Each
units
300:5 40 x 11mm Clip Fit 78mm 62mm 40mm 300A 5 A -5°C +55°C 62 x 40 x 78 mm - Surface Mount -
RS Stock No. 173-0182
BrandRS PRO
PHP892.964
Each (In a Box of 220)
units
- - - - - - 10 → 60A - -55°C +130°C 23.8 x 11.12 x 23.8 mm - PCB Mount -
RS Stock No. 173-0218
BrandRS PRO
PHP1,320.08
Each (In a Box of 25)
units
- - - - - - 100 → 250A - -55°C +130°C 44.5 x 14.3 x 44.5 mm - PCB Mount -
RS Stock No. 171-8792
BrandRS PRO
PHP790.12
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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. 171-8765
BrandRS PRO
PHP603.00
Each
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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. 171-8784
BrandRS PRO
PHP1,180.00
Each
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300:5 30 x 11mm Clip Fit 78mm 62mm 40mm 300A 5 A -5°C +55°C 62 x 40 x 78 mm - Surface Mount -
RS Stock No. 171-8844
BrandRS PRO
PHP4,810.00
Each
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2000:5 101 x 56mm Clip Fit 170mm 130mm 60mm 2kA 5 A -5°C +55°C 130 x 60 x 170 mm - Surface Mount -
RS Stock No. 124-3890
BrandRS PRO
PHP186.22
Each
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- - - - - - 40 125A - -55°C +130°C 34.9 x 14.3 x 34.9 mm - PCB Mount -
RS Stock No. 173-0238
BrandRS PRO
PHP1,638.368
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. 171-8822
BrandRS PRO
PHP2,290.25
Each
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2500:5 100 x 30mm Clip Fit 155mm 140mm 45mm 2.5kA 5 A -5°C +55°C 140 x 45 x 155 mm - Surface Mount -
RS Stock No. 171-8769
BrandRS PRO
PHP603.00
Each
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150:5 30 x 10mm Clip Fit 70mm 50mm 31mm 150A 5 A -5°C +55°C 50 x 31 x 70 mm - Surface Mount -
RS Stock No. 171-8770
BrandRS PRO
PHP988.00
Each
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200:1 30 x 10mm - 70mm 50mm 30mm - - - - 50 x 30 x 70 mm - - -
RS Stock No. 124-3903
BrandRS PRO
PHP283.41
Each
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- - - - - - 10 20A - -40°C +85°C 17.2 x 9.53 x 20.4 mm - PCB Mount -
RS Stock No. 171-8782
BrandRS PRO
PHP1,128.00
Each
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125:5 30 x 11mm Clip Fit 78mm 62mm 40mm 125A 5 A -5°C +55°C 62 x 40 x 78 mm - Surface Mount -
RS Stock No. 124-3885
BrandRS PRO
PHP681.00
Each
units
- - - - - - 10 60A - -55°C +130°C 23.8 x 11.12 x 23.8 mm - PCB Mount -
RS Stock No. 171-8825
BrandRS PRO
PHP1,371.03
Each
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125:5 35mm Base Mounted 87.5mm 105mm 38mm 125A 5 A - - 105 x 38 x 87.5 mm MCCB Surface Mount -
RS Stock No. 171-8771
BrandRS PRO
PHP607.00
Each
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200:5 30 x 10mm Clip Fit 70mm 50mm 31mm 200A 5 A -5°C +55°C 50 x 31 x 70 mm - Surface Mount -
RS Stock No. 171-8808
BrandRS PRO
PHP2,035.00
Each
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1500:1 61 x 51mm - 110mm 86mm 45mm - - - - 86 x 45 x 110 mm - - -
RS Stock No. 171-8767
BrandRS PRO
PHP962.00
Each
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