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. 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 -
RS Stock No. 171-8753
BrandRS PRO
MYR60.04
Each
units
80:5 21 x 10mm Clip Fit 65mm 45mm 40mm 80A 5 A -5°C +55°C 45 x 40 x 65 mm - Surface Mount -
RS Stock No. 173-0198
BrandRS PRO
MYR101.482
Each (In a Box of 176)
units
- - - - - - 30 → 75A - -55°C +130°C 30.2 x 14.3 x 30.2 mm - PCB Mount -
RS Stock No. 171-8770
BrandRS PRO
MYR94.12
Each
units
200:1 30 x 10mm - 70mm 50mm 30mm - - - - 50 x 30 x 70 mm - - -
RS Stock No. 171-8839
BrandRS PRO
MYR493.74
Each
units
2500:5 38 x 128mm Base Mounted 170mm 99mm 45mm 2.5kA 5 A -5°C +55°C 99 x 45 x 170 mm - Surface Mount -
RS Stock No. 171-8792
BrandRS PRO
MYR74.44
Each
units
500:5 40 x 11mm Clip Fit 78mm 62mm 40mm 500A 5 A -5°C +55°C 62 x 40 x 78 mm - Surface Mount -
RS Stock No. 171-8750
BrandRS PRO
MYR60.04
Each
units
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. 171-8842
BrandRS PRO
MYR416.15
Each
units
1500:5 101 x 56mm Clip Fit 170mm 130mm 60mm 1.5kA 5 A -5°C +55°C 130 x 60 x 170 mm - Surface Mount -
RS Stock No. 171-8785
BrandRS PRO
MYR71.42
Each
units
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. 124-3886
BrandRS PRO
MYR64.91
Each
units
- - - - - - 15 → 60A - -55°C +130°C 23.8 x 11.12 x 23.8 mm - PCB Mount -
RS Stock No. 171-8800
BrandRS PRO
MYR160.46
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. 124-3888
BrandRS PRO
MYR14.44
Each
units
- - - - - - 25 → 75A - -55°C +130°C 30.2 x 14.3 x 30.2 mm - PCB 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. 171-8764
BrandRS PRO
MYR91.69
Each
units
100:1 30 x 10mm - 70mm 50mm 30mm - - - - 50 x 30 x 70 mm - - -
RS Stock No. 171-8760
BrandRS PRO
MYR63.84
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. 173-0184
BrandRS PRO
MYR90.547
Each (In a Box of 98)
units
- - - - - - 5 → 50A - -40°C +120°C 32 x 20.5 x 35 mm - PCB Mount -
RS Stock No. 173-0237
BrandRS PRO
MYR132.739
Each (In a Box of 351)
units
- - - - - - 10 → 20A - -40°C +85°C 17.2 x 9.53 x 20.4 mm - PCB Mount -
RS Stock No. 171-8851
BrandRS PRO
MYR213.23
Each
units
400:5 33 x 23mm Base Mounted 106mm 93mm 40mm 400A 5 A +20°C +70°C 93 x 40 x 106 mm - Surface Mount -
RS Stock No. 171-8786
BrandRS PRO
MYR71.42
Each
units
150:5 40 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. 171-8771
BrandRS PRO
MYR57.87
Each
units
200:5 30 x 10mm Clip Fit 70mm 50mm 31mm 200A 5 A -5°C +55°C 50 x 31 x 70 mm - Surface Mount -
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