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. 171-8847
BrandRS PRO
PHP2,114.34
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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. 171-8789
BrandRS PRO
PHP795.31
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300:5 40 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. 171-8849
BrandRS PRO
PHP2,452.85
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250:5 33 x 23mm Base Mounted 106mm 93mm 250A 40mm 5 A +20°C +70°C 93 x 40 x 106 mm - Surface Mount -
RS Stock No. 124-3882
BrandRS PRO
PHP240.46
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- - - - - 1 → 10A - - -40°C +120°C 17.2 x 9.53 x 20.4 mm - PCB Mount -
RS Stock No. 171-8793
BrandRS PRO
PHP1,295.00
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400:1 40 x 11mm - 78mm 62mm - 40mm - - - 62 x 40 x 78 mm - - -
RS Stock No. 171-8816
BrandRS PRO
PHP2,098.77
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1600:5 80 x 12mm Clip Fit 126mm 104mm 1.6kA 45mm 5 A -5°C +55°C 104 x 45 x 126 mm - Surface Mount -
RS Stock No. 171-8843
BrandRS PRO
PHP4,102.61
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1600:5 101 x 56mm Clip Fit 170mm 130mm 1.6kA 60mm 5 A -5°C +55°C 130 x 60 x 170 mm - Surface Mount -
RS Stock No. 171-8831
BrandRS PRO
PHP1,691.78
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300:5 45mm Base Mounted 102.5mm 141mm 300A 38mm 5 A - - 141 x 38 x 102.5 mm MCCB Surface Mount -
RS Stock No. 171-8808
BrandRS PRO
PHP1,923.68
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1500:1 61 x 51mm - 110mm 86mm - 45mm - - - 86 x 45 x 110 mm - - -
RS Stock No. 173-0181
BrandRS PRO
PHP197.143
Each (In a Box of 351)
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- - - - - 1 → 10A - - -40°C +120°C 17.2 x 9.53 x 20.4 mm - PCB Mount -
RS Stock No. 124-3902
BrandRS PRO
PHP189.88
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- - - - - 50A - - -40°C +85°C 23.8 x 11.12 x 23.8 mm - PCB Mount -
RS Stock No. 171-8834
BrandRS PRO
PHP3,444.70
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1000:5 38 x 128mm Base Mounted 170mm 99mm 1kA 45mm 5 A -5°C +55°C 99 x 45 x 170 mm - Surface Mount -
RS Stock No. 171-8753
BrandRS PRO
PHP665.06
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80:5 21 x 10mm Clip Fit 65mm 45mm 80A 40mm 5 A -5°C +55°C 45 x 40 x 65 mm - Surface Mount -
RS Stock No. 173-0044
BrandRS PRO
PHP71.904
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- - - - - 15A - - -40°C +120°C 17.2 x 9.53 x 20.4 mm - PCB Mount -
RS Stock No. 171-8857
BrandRS PRO
PHP1,049.00
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15:5 62 x 40mm Clip Fit 78mm 62mm 15A 40mm 5 A -5°C +55°C 62 x 40 x 78 mm - Surface Mount -
RS Stock No. 171-8840
BrandRS PRO
PHP3,418.58
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1000:5 101 x 56mm Clip Fit 170mm 130mm 1kA 60mm 5 A -5°C +55°C 130 x 60 x 170 mm - Surface Mount -
RS Stock No. 171-8790
BrandRS PRO
PHP1,224.09
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400:1 40 x 11mm - 78mm 62mm - 40mm - - - 62 x 40 x 78 mm - - -
RS Stock No. 171-8761
BrandRS PRO
PHP710.49
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250:5 21 x 10mm Clip Fit 65mm 45mm 250A 40mm 5 A -5°C +55°C 45 x 40 x 65 mm - Surface Mount -
RS Stock No. 171-8785
BrandRS PRO
PHP795.31
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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. 171-8769
BrandRS PRO
PHP603.00
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150:5 30 x 10mm Clip Fit 70mm 50mm 150A 31mm 5 A -5°C +55°C 50 x 31 x 70 mm - Surface Mount -
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