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 Input Current Overall Depth Output Current Minimum Temperature Maximum Temperature Dimensions For Use With Mounting Type Series
RS Stock No. 124-3896
BrandRS PRO
MYR19.61
Each
units
- - - - - 25A - - -40°C +85°C 19 x 11.5 x 21.5 mm - - -
RS Stock No. 171-8855
BrandRS PRO
MYR92.92
Each
units
5:5 62 x 40mm Clip Fit 78mm 62mm 5A 40mm 5 A -5°C +55°C 62 x 40 x 78 mm - Surface Mount -
RS Stock No. 171-8788
BrandRS PRO
MYR71.42
Each
units
250:5 40 x 11mm Clip Fit 78mm 62mm 250A 40mm 5 A -5°C +55°C 62 x 40 x 78 mm - Surface Mount -
RS Stock No. 171-8860
BrandRS PRO
MYR117.66
Each
units
40:5 74 x 45mm Clip Fit 98mm 74mm 40A 45mm 5 A -5°C +55°C 74 x 45 x 98 mm - Surface Mount -
RS Stock No. 171-8813
BrandRS PRO
MYR142.89
Each
units
1200:5 80 x 12mm Clip Fit 126mm 104mm 1.2kA 45mm 5 A -5°C +55°C 104 x 45 x 126 mm - Surface Mount -
RS Stock No. 171-8750
BrandRS PRO
MYR59.23
Each
units
50:5 21 x 10mm Clip Fit 65mm 45mm 50A 40mm 5 A -5°C +55°C 45 x 40 x 65 mm - Surface Mount -
RS Stock No. 171-8771
BrandRS PRO
MYR51.49
Each
units
200:5 30 x 10mm Clip Fit 70mm 50mm 200A 31mm 5 A -5°C +55°C 50 x 31 x 70 mm - Surface Mount -
RS Stock No. 171-8832
BrandRS PRO
MYR146.53
Each
units
400:5 45mm Base Mounted 102.5mm 141mm 400A 38mm 5 A - - 141 x 38 x 102.5 mm MCCB Surface Mount -
RS Stock No. 171-8797
BrandRS PRO
MYR101.52
Each
units
- - - - - - - - - - - - - -
RS Stock No. 171-8826
BrandRS PRO
MYR124.56
Each
units
150:5 35mm Base Mounted 87.5mm 105mm 150A 38mm 5 A - - 105 x 38 x 87.5 mm MCCB Surface Mount -
RS Stock No. 171-8859
BrandRS PRO
MYR92.92
Each
units
30:5 62 x 40mm Clip Fit 78mm 62mm 30A 40mm 5 A -5°C +55°C 62 x 40 x 78 mm - Surface Mount -
RS Stock No. 124-3888
BrandRS PRO
MYR25.21
Each
units
- - - - - 25 → 75A - - -55°C +130°C 30.2 x 14.3 x 30.2 mm - PCB Mount -
RS Stock No. 171-8851
BrandRS PRO
MYR227.15
Each
units
400:5 33 x 23mm Base Mounted 106mm 93mm 400A 40mm 5 A +20°C +70°C 93 x 40 x 106 mm - Surface Mount -
RS Stock No. 124-3903
BrandRS PRO
MYR25.48
Each
units
- - - - - 10 → 20A - - -40°C +85°C 17.2 x 9.53 x 20.4 mm - PCB Mount -
RS Stock No. 171-8822
BrandRS PRO
MYR215.88
Each
units
2500:5 100 x 30mm Clip Fit 155mm 140mm 2.5kA 45mm 5 A -5°C +55°C 140 x 45 x 155 mm - Surface Mount -
RS Stock No. 173-0201
BrandRS PRO
MYR14.468
Each (In a Box of 114)
units
- - - - - 60 → 200A - - -55°C +130°C 38.1 x 15.9 x 38.1 mm - PCB Mount -
RS Stock No. 171-8825
BrandRS PRO
MYR124.56
Each
units
125:5 35mm Base Mounted 87.5mm 105mm 125A 38mm 5 A - - 105 x 38 x 87.5 mm MCCB Surface Mount -
RS Stock No. 171-8837
BrandRS PRO
MYR351.66
Each
units
1600:5 38 x 128mm Base Mounted 170mm 99mm 1.6kA 45mm 5 A -5°C +55°C 99 x 45 x 170 mm - Surface Mount -
RS Stock No. 171-8749
BrandRS PRO
MYR83.38
Each
units
50:1 21 x 10mm - 65mm 45mm - 40mm - - - 45 x 40 x 65 mm - - -
RS Stock No. 171-8794
BrandRS PRO
MYR74.44
Each
units
600:5 40 x 11mm Clip Fit 78mm 62mm 600A 40mm 5 A -5°C +55°C 62 x 40 x 78 mm - Surface Mount -
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