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. 171-8762
BrandRS PRO
MYR63.84
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. 171-8804
BrandRS PRO
MYR172.14
Each
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1000:5 41 x 41mm Clip Fit 98mm 74mm 45mm 1kA 5 A -5°C +55°C 74 x 45 x 98 mm - Surface Mount -
RS Stock No. 171-8785
BrandRS PRO
MYR71.42
Each
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100:5 40 x 11mm Clip Fit 78mm 62mm 40mm 100A 5 A -5°C +55°C 62 x 40 x 78 mm - Surface Mount -
RS Stock No. 171-8750
BrandRS PRO
MYR60.04
Each
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50:5 21 x 10mm Clip Fit 65mm 45mm 40mm 50A 5 A -5°C +55°C 45 x 40 x 65 mm - Surface Mount -
RS Stock No. 171-8806
BrandRS PRO
MYR193.97
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1250:1 61 x 51mm - 110mm 86mm 45mm - - - - 86 x 45 x 110 mm - - -
RS Stock No. 124-3885
BrandRS PRO
MYR55.18
Each
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- - - - - - 10 → 60A - -55°C +130°C 23.8 x 11.12 x 23.8 mm - PCB Mount -
RS Stock No. 171-8841
BrandRS PRO
MYR373.83
Each
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1250:5 101 x 56mm Clip Fit 170mm 130mm 60mm 1.25kA 5 A -5°C +55°C 130 x 60 x 170 mm - Surface Mount -
RS Stock No. 171-8782
BrandRS PRO
MYR107.56
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. 124-3889
BrandRS PRO
MYR14.44
Each
units
- - - - - - 30 → 75A - -55°C +130°C 30.2 x 14.3 x 30.2 mm - PCB Mount -
RS Stock No. 124-3900
BrandRS PRO
MYR16.80
Each
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- - - - - - 10A - -40°C +120°C 17.2 x 9.53 x 20.4 mm - PCB Mount -
RS Stock No. 171-8801
BrandRS PRO
MYR166.59
Each
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600:5 41 x 41mm Clip Fit 98mm 74mm 45mm 600A 5 A -5°C +55°C 74 x 45 x 98 mm - Surface Mount -
RS Stock No. 173-0216
BrandRS PRO
MYR113.243
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 -
RS Stock No. 171-8754
BrandRS PRO
MYR101.61
Each
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100:1 21 x 10mm - 65mm 45mm 40mm - - - - 45 x 40 x 65 mm - - -
RS Stock No. 171-8784
BrandRS PRO
MYR112.53
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. 171-8773
BrandRS PRO
MYR58.20
Each
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250:5 30 x 10mm Clip Fit 70mm 50mm 31mm 250A 5 A -5°C +55°C 50 x 31 x 70 mm - Surface Mount -
RS Stock No. 173-0220
BrandRS PRO
MYR113.243
Each (In a Box of 140)
units
- - - - - - 25A - -40°C +85°C 19 x 11.5 x 21.5 mm - - -
RS Stock No. 171-8810
BrandRS PRO
MYR162.22
Each
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1500:5 61 x 51mm Clip Fit 110mm 86mm 45mm 1.5kA 5 A -5°C +55°C 86 x 45 x 110 mm - Surface Mount -
RS Stock No. 171-8847
BrandRS PRO
MYR176.27
Each
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150:5 33 x 23mm Base Mounted 106mm 93mm 40mm 150A 5 A +20°C +70°C 93 x 40 x 106 mm - Surface Mount -
RS Stock No. 171-8766
BrandRS PRO
MYR57.53
Each
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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. 124-3892
BrandRS PRO
MYR16.97
Each
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- - - - - - 60 → 200A - -55°C +130°C 38.1 x 15.9 x 38.1 mm - PCB Mount -
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