Current Transformers

Current transformers or (CT’s) are instruments that are used to transform the current from a high current into a lower current so that the power can then be used for measuring and controlling. The transformers consist of a core, a primary and a secondary winding.RS Components offer an extensive range of highly accurate CT’s in various transformer types, current ratings, CT ratio supply voltages and mounting types to suit every application. Supplied by industry-leading brands including Siemens, Murata Power Solutions LEM and of course RS PRO.

How does a current transformer work?

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.

Types of current transformer

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.

Where would I use a current transformer?

CT's are used in a wide range of industrial and commercial measurement applications. Some of the most common are:Generating stationsElectrical substationsCommercial electric power distributionElectrical panels


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Description Price Current Ratio Bore Size Transformer Type Sensor Technology Supply Voltage Input Current Output Current Overall Height Minimum Temperature Overall Width Maximum Temperature Overall Depth Dimensions For Use With
RS Stock No. 171-8787
BrandRS PRO
£10.56
Each
Units
200:5 40 x 11mm Clip Fit - - 200A 5 A 78mm -5°C 62mm +55°C 40mm 62 x 40 x 78 mm -
RS Stock No. 171-8772
BrandRS PRO
£12.25
Each
Units
250:1 30 x 10mm - - - - - 70mm - 50mm - 30mm 50 x 30 x 70 mm -
RS Stock No. 171-8814
BrandRS PRO
£24.72
Each
Units
1250:5 80 x 12mm Clip Fit - - 1250A 5 A 126mm -5°C 104mm +55°C 45mm 104 x 45 x 126 mm -
RS Stock No. 171-8848
BrandRS PRO
£28.09
Each
Units
200:5 33 x 23mm Base Mounted - - 200A 5 A 106mm +20°C 93mm +70°C 40mm 93 x 40 x 106 mm -
RS Stock No. 171-8806
BrandRS PRO
£24.72
Each
Units
1250:1 61 x 51mm - - - - - 110mm - 86mm - 45mm 86 x 45 x 110 mm -
RS Stock No. 171-8760
BrandRS PRO
£9.44
Each
Units
200:5 21 x 10mm Clip Fit - - 200A 5 A 65mm -5°C 45mm +55°C 40mm 45 x 40 x 65 mm -
RS Stock No. 171-8845
BrandRS PRO
£62.92
Each
Units
2500:5 101 x 56mm Clip Fit - - 2500A 5 A 170mm -5°C 130mm +55°C 60mm 130 x 60 x 170 mm -
RS Stock No. 171-8833
BrandRS PRO
£22.47
Each
Units
600:5 45mm Base Mounted - - 600A 5 A 102.5mm - 141mm - 38mm 141 x 38 x 102.5 mm MCCB
RS Stock No. 171-8785
BrandRS PRO
£10.56
Each
Units
100:5 40 x 11mm Clip Fit - - 100A 5 A 78mm -5°C 62mm +55°C 40mm 62 x 40 x 78 mm -
RS Stock No. 171-8831
BrandRS PRO
£22.47
Each
Units
300:5 45mm Base Mounted - - 300A 5 A 102.5mm - 141mm - 38mm 141 x 38 x 102.5 mm MCCB
RS Stock No. 171-8764
BrandRS PRO
£11.80
Each
Units
100:1 30 x 10mm - - - - - 70mm - 50mm - 30mm 50 x 30 x 70 mm -
RS Stock No. 171-8826
BrandRS PRO
£19.10
Each
Units
150:5 35mm Base Mounted - - 150A 5 A 87.5mm - 105mm - 38mm 105 x 38 x 87.5 mm MCCB
RS Stock No. 171-8754
BrandRS PRO
£12.92
Each
Units
100:1 21 x 10mm - - - - - 65mm - 45mm - 40mm 45 x 40 x 65 mm -
RS Stock No. 171-8791
BrandRS PRO
£11.01
Each
Units
400:5 40 x 11mm Clip Fit - - 400A 5 A 78mm -5°C 62mm +55°C 40mm 62 x 40 x 78 mm -
RS Stock No. 171-8766
BrandRS PRO
£7.75
Each
Units
125:5 30 x 10mm Clip Fit - - 125A 5 A 70mm -5°C 50mm +55°C 31mm 50 x 31 x 70 mm -
RS Stock No. 171-8798
BrandRS PRO
£11.69
Each
Units
800:5 40 x 11mm Clip Fit - - 800A 5 A 78mm -5°C 62mm +55°C 40mm 62 x 40 x 78 mm -
RS Stock No. 171-8811
BrandRS PRO
£23.03
Each
Units
800:5 80 x 12mm Clip Fit - - 800A 5 A 126mm -5°C 104mm +55°C 45mm 104 x 45 x 126 mm -
RS Stock No. 171-8859
BrandRS PRO
£13.93
Each
Units
30:5 62 x 40mm Clip Fit - - 30A 5 A 78mm -5°C 62mm +55°C 40mm 62 x 40 x 78 mm -
RS Stock No. 171-8782
BrandRS PRO
£13.82
Each
Units
125:5 30 x 11mm Clip Fit - - 125A 5 A 78mm -5°C 62mm +55°C 40mm 62 x 40 x 78 mm -
RS Stock No. 171-8828
BrandRS PRO
£19.10
Each
Units
200:5 35mm Base Mounted - - 200A 5 A 87.5mm - 105mm - 38mm 105 x 38 x 87.5 mm MCCB