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. 173-0236
BrandRS PRO
$40.251
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. 124-3884
BrandRS PRO
$12.06
Each
units
- - - - - - 5 → 60A - -55°C +130°C 23.8 x 11.12 x 23.8 mm - PCB Mount -
RS Stock No. 124-3883
BrandRS PRO
$4.66
Each
units
- - - - - - 5 → 50A - -40°C +120°C 32 x 20.5 x 35 mm - PCB Mount -
RS Stock No. 124-3901
BrandRS PRO
$3.68
Each
units
- - - - - - 15A - -40°C +120°C 17.2 x 9.53 x 20.4 mm - PCB Mount -
RS Stock No. 124-3893
BrandRS PRO
$4.10
Each
units
- - - - - - 75 → 200A - -55°C +130°C 38.1 x 15.9 x 38.1 mm - PCB Mount -
RS Stock No. 173-0217
BrandRS PRO
$29.188
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. 173-0182
BrandRS PRO
$21.938
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. 171-8759
BrandRS PRO
$34.43
Each
units
200:1 21 x 10mm - 65mm 45mm 40mm - - - - 45 x 40 x 65 mm - - -
RS Stock No. 173-0183
BrandRS PRO
$21.938
Each (In a Box of 220)
units
- - - - - - 15 → 60A - -55°C +130°C 23.8 x 11.12 x 23.8 mm - PCB Mount -
RS Stock No. 171-8760
BrandRS PRO
$20.86
Each
units
200:5 21 x 10mm Clip Fit 65mm 45mm 40mm 200A 5 A -5°C +55°C 45 x 40 x 65 mm - Surface Mount -
RS Stock No. 124-3885
BrandRS PRO
$14.93
Each
units
- - - - - - 10 → 60A - -55°C +130°C 23.8 x 11.12 x 23.8 mm - PCB Mount -
RS Stock No. 171-8786
BrandRS PRO
$23.34
Each
units
150:5 40 x 11mm Clip Fit 78mm 62mm 40mm 150A 5 A -5°C +55°C 62 x 40 x 78 mm - Surface Mount -
RS Stock No. 171-8846
BrandRS PRO
$63.29
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. 173-0199
BrandRS PRO
$26.157
Each (In a Box of 133)
units
- - - - - - 40 → 125A - -55°C +130°C 34.9 x 14.3 x 34.9 mm - PCB Mount -
RS Stock No. 171-8827
BrandRS PRO
$40.17
Each
units
160:5 35mm Base Mounted 87.5mm 105mm 38mm 160A 5 A - - 105 x 38 x 87.5 mm MCCB Surface Mount -
RS Stock No. 171-8850
BrandRS PRO
$68.86
Each
units
300:5 33 x 23mm Base Mounted 106mm 93mm 40mm 300A 5 A +20°C +70°C 93 x 40 x 106 mm - Surface Mount -
RS Stock No. 171-8800
BrandRS PRO
$52.22
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. 124-3898
BrandRS PRO
$3.14
Each
units
- - - - - - 5A - -40°C +120°C 17.2 x 9.53 x 20.4 mm - PCB Mount -
RS Stock No. 171-8854
BrandRS PRO
$91.83
Each
units
600:5 55 x 43mm Base Mounted 125mm 108mm 51mm 600A 5 A +20°C +70°C 108 x 51 x 125 mm - Surface Mount -
RS Stock No. 124-3886
BrandRS PRO
$14.93
Each
units
- - - - - - 15 → 60A - -55°C +130°C 23.8 x 11.12 x 23.8 mm - PCB Mount -
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