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. 171-8844
BrandRS PRO
€73.48
Each
units
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. 171-8767
BrandRS PRO
€14.83
Each
units
- - - - - - - - - - - - - -
RS Stock No. 171-8814
BrandRS PRO
€31.08
Each
units
1250:5 80 x 12mm Clip Fit 126mm 104mm 45mm 1.25kA 5 A -5°C +55°C 104 x 45 x 126 mm - Surface Mount -
RS Stock No. 171-8749
BrandRS PRO
€16.25
Each
units
50:1 21 x 10mm - 65mm 45mm 40mm - - - - 45 x 40 x 65 mm - - -
RS Stock No. 171-8848
BrandRS PRO
€35.32
Each
units
200:5 33 x 23mm Base Mounted 106mm 93mm 40mm 200A 5 A +20°C +70°C 93 x 40 x 106 mm - Surface Mount -
RS Stock No. 124-3888
BrandRS PRO
€4.16
Each
units
- - - - - - 25 → 75A - -55°C +130°C 30.2 x 14.3 x 30.2 mm - PCB Mount -
RS Stock No. 171-8820
BrandRS PRO
€34.48
Each
units
1600:5 100 x 30mm Clip Fit 155mm 140mm 45mm 1.6kA 5 A -5°C +55°C 140 x 45 x 155 mm - Surface Mount -
RS Stock No. 171-8784
BrandRS PRO
€18.23
Each
units
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. 171-8787
BrandRS PRO
€13.29
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. 171-8756
BrandRS PRO
€11.87
Each
units
125:5 21 x 10mm Clip Fit 65mm 45mm 40mm 125A 5 A -5°C +55°C 45 x 40 x 65 mm - Surface Mount -
RS Stock No. 171-8840
BrandRS PRO
€55.25
Each
units
1000:5 101 x 56mm Clip Fit 170mm 130mm 60mm 1kA 5 A -5°C +55°C 130 x 60 x 170 mm - Surface Mount -
RS Stock No. 171-8807
BrandRS PRO
€26.00
Each
units
1250:5 61 x 51mm Clip Fit 110mm 86mm 45mm 1.25kA 5 A -5°C +55°C 86 x 45 x 110 mm - Surface Mount -
RS Stock No. 124-3880
BrandRS PRO
€1.19
Each
units
- - - - - - 15A - -40°C +120°C 17.2 x 9.53 x 20.4 mm - PCB Mount -
RS Stock No. 173-0217
BrandRS PRO
€4.724
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. 171-8813
BrandRS PRO
€27.56
Each
units
1200:5 80 x 12mm Clip Fit 126mm 104mm 45mm 1.2kA 5 A -5°C +55°C 104 x 45 x 126 mm - Surface Mount -
RS Stock No. 171-8851
BrandRS PRO
€43.81
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. 173-0196
BrandRS PRO
€2.403
Each (In a Box of 220)
units
- - - - - - 20 → 60A - -55°C +130°C 23.8 x 11.12 x 23.8 mm - PCB Mount -
RS Stock No. 171-8762
BrandRS PRO
€11.87
Each
units
300:5 21 x 10mm Clip Fit 65mm 45mm 40mm 300A 5 A -5°C +55°C 45 x 40 x 65 mm - Surface Mount -
RS Stock No. 124-3890
BrandRS PRO
€2.84
Each
units
- - - - - - 40 → 125A - -55°C +130°C 34.9 x 14.3 x 34.9 mm - PCB Mount -
RS Stock No. 173-0044
BrandRS PRO
€1.044
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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