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. 171-8805
BrandRS PRO
MYR158.37
Each
units
1000:5 61 x 51mm Clip Fit 110mm 86mm 45mm 1kA 5 A -5°C +55°C 86 x 45 x 110 mm - Surface Mount -
RS Stock No. 171-8783
BrandRS PRO
MYR110.43
Each
units
150:5 30 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. 171-8762
BrandRS PRO
MYR63.84
Each
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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. 171-8798
BrandRS PRO
MYR78.99
Each
units
800:5 40 x 11mm Clip Fit 78mm 62mm 40mm 800A 5 A -5°C +55°C 62 x 40 x 78 mm - Surface Mount -
RS Stock No. 171-8801
BrandRS PRO
MYR166.59
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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. 171-8781
BrandRS PRO
MYR107.56
Each
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100:5 30 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. 171-8816
BrandRS PRO
MYR211.60
Each
units
1600:5 80 x 12mm Clip Fit 126mm 104mm 45mm 1.6kA 5 A -5°C +55°C 104 x 45 x 126 mm - Surface Mount -
RS Stock No. 171-8810
BrandRS PRO
MYR162.22
Each
units
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. 173-0215
BrandRS PRO
MYR113.243
Each (In a Box of 351)
units
- - - - - - 5A - -40°C +120°C 17.2 x 9.53 x 20.4 mm - PCB Mount -
RS Stock No. 171-8820
BrandRS PRO
MYR216.78
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. 173-0219
BrandRS PRO
MYR125.823
Each (In a Box of 18)
units
- - - - - - 200 → 500A - -55°C +130°C 55.6 x 20.6 x 55.6 mm - PCB Mount -
RS Stock No. 171-8818
BrandRS PRO
MYR216.78
Each
units
1500:5 100 x 30mm Clip Fit 155mm 140mm 45mm 1.5kA 5 A -5°C +55°C 140 x 45 x 155 mm - Surface Mount -
RS Stock No. 171-8795
BrandRS PRO
MYR78.99
Each
units
750:5 40 x 11mm Clip Fit 78mm 62mm 40mm 750A 5 A -5°C +55°C 62 x 40 x 78 mm - Surface Mount -
RS Stock No. 171-8827
BrandRS PRO
MYR121.26
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. 171-8777
BrandRS PRO
MYR57.89
Each
units
400:5 30 x 10mm Clip Fit 70mm 50mm 31mm 400A 5 A -5°C +55°C 50 x 31 x 70 mm - Surface Mount -
RS Stock No. 171-8850
BrandRS PRO
MYR206.36
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. 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. 171-8821
BrandRS PRO
MYR215.88
Each
units
2000:5 100 x 30mm Clip Fit 155mm 140mm 45mm 2kA 5 A -5°C +55°C 140 x 45 x 155 mm - Surface Mount -
RS Stock No. 171-8829
BrandRS PRO
MYR121.26
Each
units
250:5 35mm Base Mounted 87.5mm 105mm 38mm 250A 5 A - - 105 x 38 x 87.5 mm MCCB Surface Mount -
RS Stock No. 173-0181
BrandRS PRO
MYR85.114
Each (In a Box of 351)
units
- - - - - - 1 → 10A - -40°C +120°C 17.2 x 9.53 x 20.4 mm - PCB Mount -
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