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. 171-8813
BrandRS PRO
SGD42.58
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. 171-8845
BrandRS PRO
SGD121.98
Each
units
2500:5 101 x 56mm Clip Fit 170mm 130mm 60mm 2.5kA 5 A -5°C +55°C 130 x 60 x 170 mm - Surface Mount -
RS Stock No. 124-3900
BrandRS PRO
SGD6.63
Each
units
- - - - - - 10A - -40°C +120°C 17.2 x 9.53 x 20.4 mm - PCB Mount -
RS Stock No. 171-8847
BrandRS PRO
SGD54.45
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. 124-3901
BrandRS PRO
SGD2.69
Each
units
- - - - - - 15A - -40°C +120°C 17.2 x 9.53 x 20.4 mm - PCB Mount -
RS Stock No. 171-8820
BrandRS PRO
SGD54.95
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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. 124-3899
BrandRS PRO
SGD5.89
Each
units
- - - - - - 7.5A - -40°C +120°C 17.2 x 9.53 x 20.4 mm - PCB Mount -
RS Stock No. 171-8814
BrandRS PRO
SGD47.91
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. 124-3902
BrandRS PRO
SGD4.89
Each
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- - - - - - 50A - -40°C +85°C 23.8 x 11.12 x 23.8 mm - PCB Mount -
RS Stock No. 171-8822
BrandRS PRO
SGD63.94
Each
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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. 173-0200
BrandRS PRO
SGD32.516
Each (In a Box of 133)
units
- - - - - - 50 → 125A - -55°C +130°C 34.9 x 14.3 x 34.9 mm - PCB Mount -
RS Stock No. 171-8764
BrandRS PRO
SGD22.47
Each
units
100:1 30 x 10mm - 70mm 50mm 30mm - - - - 50 x 30 x 70 mm - - -
RS Stock No. 171-8840
BrandRS PRO
SGD85.17
Each
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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. 124-3894
BrandRS PRO
SGD7.12
Each
units
- - - - - - 100 → 250A - -55°C +130°C 44.5 x 14.3 x 44.5 mm - PCB Mount -
RS Stock No. 171-8800
BrandRS PRO
SGD39.64
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. 171-8762
BrandRS PRO
SGD18.92
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. 171-8829
BrandRS PRO
SGD37.29
Each
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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. 171-8810
BrandRS PRO
SGD42.87
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. 173-0238
BrandRS PRO
SGD4.393
Each (In a Box of 220)
units
- - - - - - 50A - -40°C +85°C 23.8 x 11.12 x 23.8 mm - PCB Mount -
RS Stock No. 124-3890
BrandRS PRO
SGD5.03
Each
units
- - - - - - 40 → 125A - -55°C +130°C 34.9 x 14.3 x 34.9 mm - PCB Mount -
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