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. 171-8835
BrandRS PRO
MYR297.96
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. 171-8806
BrandRS PRO
MYR159.49
Each
units
1250:1 61 x 51mm - 110mm 86mm 45mm - - - - 86 x 45 x 110 mm - - -
RS Stock No. 171-8808
BrandRS PRO
MYR159.49
Each
units
1500:1 61 x 51mm - 110mm 86mm 45mm - - - - 86 x 45 x 110 mm - - -
RS Stock No. 173-0197
BrandRS PRO
MYR22.971
Each (In a Box of 176)
units
- - - - - - 25 → 75A - -55°C +130°C 30.2 x 14.3 x 30.2 mm - PCB Mount -
RS Stock No. 171-8813
BrandRS PRO
MYR142.89
Each
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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. 124-3903
BrandRS PRO
MYR25.48
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. 173-0181
BrandRS PRO
MYR16.898
Each (In a Box of 351)
units
- - - - - - 1 → 10A - -40°C +120°C 17.2 x 9.53 x 20.4 mm - PCB Mount -
RS Stock No. 171-8844
BrandRS PRO
MYR377.01
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. 173-0184
BrandRS PRO
MYR29.051
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. 124-3902
BrandRS PRO
MYR16.32
Each
units
- - - - - - 50A - -40°C +85°C 23.8 x 11.12 x 23.8 mm - PCB Mount -
RS Stock No. 171-8857
BrandRS PRO
MYR94.23
Each
units
15:5 62 x 40mm Clip Fit 78mm 62mm 40mm 15A 5 A -5°C +55°C 62 x 40 x 78 mm - Surface Mount -
RS Stock No. 171-8837
BrandRS PRO
MYR351.66
Each
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1600:5 38 x 128mm Base Mounted 170mm 99mm 45mm 1.6kA 5 A -5°C +55°C 99 x 45 x 170 mm - Surface Mount -
RS Stock No. 171-8760
BrandRS PRO
MYR63.84
Each
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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. 171-8782
BrandRS PRO
MYR89.18
Each
units
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. 171-8822
BrandRS PRO
MYR215.88
Each
units
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. 171-8833
BrandRS PRO
MYR146.53
Each
units
600:5 45mm Base Mounted 102.5mm 141mm 38mm 600A 5 A - - 141 x 38 x 102.5 mm MCCB Surface Mount -
RS Stock No. 171-8766
BrandRS PRO
MYR50.03
Each
units
125:5 30 x 10mm Clip Fit 70mm 50mm 31mm 125A 5 A -5°C +55°C 50 x 31 x 70 mm - Surface Mount -
RS Stock No. 171-8842
BrandRS PRO
MYR347.32
Each
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1500:5 101 x 56mm Clip Fit 170mm 130mm 60mm 1.5kA 5 A -5°C +55°C 130 x 60 x 170 mm - Surface Mount -
RS Stock No. 171-8778
BrandRS PRO
MYR63.76
Each
units
500:5 30 x 10mm Clip Fit 70mm 50mm 31mm 500A 5 A -5°C +55°C 50 x 31 x 70 mm - Surface Mount -
RS Stock No. 173-0216
BrandRS PRO
MYR17.848
Each (In a Box of 351)
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- - - - - - 7.5A - -40°C +120°C 17.2 x 9.53 x 20.4 mm - PCB Mount -
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