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. 171-8764
BrandRS PRO
PHP962.00
Each
units
100:1 30 x 10mm - 70mm 50mm 30mm - - - - 50 x 30 x 70 mm - - -
RS Stock No. 171-8845
BrandRS PRO
PHP5,180.00
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. 171-8848
BrandRS PRO
PHP2,015.74
Each
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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. 171-8779
BrandRS PRO
PHP766.38
Each
units
600:5 30 x 10mm Clip Fit 70mm 50mm 31mm 600A 5 A -5°C +55°C 50 x 31 x 70 mm - Surface Mount -
RS Stock No. 171-8756
BrandRS PRO
PHP677.35
Each
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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. 173-0182
BrandRS PRO
PHP892.964
Each (In a Box of 220)
units
- - - - - - 10 → 60A - -55°C +130°C 23.8 x 11.12 x 23.8 mm - PCB Mount -
RS Stock No. 171-8827
BrandRS PRO
PHP1,371.03
Each
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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. 171-8802
BrandRS PRO
PHP1,750.00
Each
units
800:5 41 x 41mm Clip Fit 98mm 74mm 45mm 800A 5 A -5°C +55°C 74 x 45 x 98 mm - Surface Mount -
RS Stock No. 173-0220
BrandRS PRO
PHP1,188.071
Each (In a Box of 140)
units
- - - - - - 25A - -40°C +85°C 19 x 11.5 x 21.5 mm - - -
RS Stock No. 171-8788
BrandRS PRO
PHP758.22
Each
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250:5 40 x 11mm Clip Fit 78mm 62mm 40mm 250A 5 A -5°C +55°C 62 x 40 x 78 mm - Surface Mount -
RS Stock No. 171-8760
BrandRS PRO
PHP677.35
Each
units
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. 171-8757
BrandRS PRO
PHP1,110.00
Each
units
- - - - - - - - - - - - - -
RS Stock No. 171-8806
BrandRS PRO
PHP2,035.00
Each
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1250:1 61 x 51mm - 110mm 86mm 45mm - - - - 86 x 45 x 110 mm - - -
RS Stock No. 171-8825
BrandRS PRO
PHP1,371.03
Each
units
125:5 35mm Base Mounted 87.5mm 105mm 38mm 125A 5 A - - 105 x 38 x 87.5 mm MCCB Surface Mount -
RS Stock No. 171-8784
BrandRS PRO
PHP1,180.00
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. 124-3903
BrandRS PRO
PHP283.41
Each
units
- - - - - - 10 20A - -40°C +85°C 17.2 x 9.53 x 20.4 mm - PCB Mount -
RS Stock No. 173-0044
BrandRS PRO
PHP68.551
Each (In a Box of 351)
units
- - - - - - 15A - -40°C +120°C 17.2 x 9.53 x 20.4 mm - PCB Mount -
RS Stock No. 171-8801
BrandRS PRO
PHP1,713.00
Each
units
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. 171-8812
BrandRS PRO
PHP1,998.00
Each
units
1000:5 80 x 12mm Clip Fit 126mm 104mm 45mm 1kA 5 A -5°C +55°C 104 x 45 x 126 mm - Surface Mount -
RS Stock No. 171-8758
BrandRS PRO
PHP677.35
Each
units
150:5 21 x 10mm Clip Fit 65mm 45mm 40mm 150A 5 A -5°C +55°C 45 x 40 x 65 mm - Surface Mount -
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