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. 171-8777
BrandRS PRO
£9.10
Each
Units
400:5 30 x 10mm Clip Fit - - 400A 5 A 70mm -5°C 50mm +55°C 31mm 50 x 31 x 70 mm -
RS Stock No. 171-8750
BrandRS PRO
£8.88
Each
Units
50:5 21 x 10mm Clip Fit - - 50A 5 A 65mm -5°C 45mm +55°C 40mm 45 x 40 x 65 mm -
RS Stock No. 171-8788
BrandRS PRO
£10.56
Each
Units
250:5 40 x 11mm Clip Fit - - 250A 5 A 78mm -5°C 62mm +55°C 40mm 62 x 40 x 78 mm -
RS Stock No. 171-8773
BrandRS PRO
£8.20
Each
Units
250:5 30 x 10mm Clip Fit - - 250A 5 A 70mm -5°C 50mm +55°C 31mm 50 x 31 x 70 mm -
RS Stock No. 171-8815
BrandRS PRO
£25.84
Each
Units
1500:5 80 x 12mm Clip Fit - - 1500A 5 A 126mm -5°C 104mm +55°C 45mm 104 x 45 x 126 mm -
RS Stock No. 171-8818
BrandRS PRO
£27.42
Each
Units
1500:5 100 x 30mm Clip Fit - - 1500A 5 A 155mm -5°C 140mm +55°C 45mm 140 x 45 x 155 mm -
RS Stock No. 171-8756
BrandRS PRO
£9.44
Each
Units
125:5 21 x 10mm Clip Fit - - 125A 5 A 65mm -5°C 45mm +55°C 40mm 45 x 40 x 65 mm -
RS Stock No. 171-8849
BrandRS PRO
£32.58
Each
Units
250:5 33 x 23mm Base Mounted - - 250A 5 A 106mm +20°C 93mm +70°C 40mm 93 x 40 x 106 mm -
RS Stock No. 171-8854
BrandRS PRO
£41.57
Each
Units
600:5 55 x 43mm Base Mounted - - 600A 5 A 125mm +20°C 108mm +70°C 51mm 108 x 51 x 125 mm -
RS Stock No. 171-8821
BrandRS PRO
£31.91
Each
Units
2000:5 100 x 30mm Clip Fit - - 2000A 5 A 155mm -5°C 140mm +55°C 45mm 140 x 45 x 155 mm -
RS Stock No. 171-8793
BrandRS PRO
£7.70
Each
Units
400:1 40 x 11mm - - - - - 78mm - 62mm - 40mm 62 x 40 x 78 mm -
RS Stock No. 171-8807
BrandRS PRO
£20.67
Each
Units
1250:5 61 x 51mm Clip Fit - - 1250A 5 A 110mm -5°C 86mm +55°C 45mm 86 x 45 x 110 mm -
RS Stock No. 171-8769
BrandRS PRO
£7.75
Each
Units
150:5 30 x 10mm Clip Fit - - 150A 5 A 70mm -5°C 50mm +55°C 31mm 50 x 31 x 70 mm -
RS Stock No. 171-8800
BrandRS PRO
£20.45
Each
Units
500:5 41 x 41mm Clip Fit - - 500A 5 A 98mm -5°C 74mm +55°C 45mm 74 x 45 x 98 mm -
RS Stock No. 171-8761
BrandRS PRO
£9.44
Each
Units
250:5 21 x 10mm Clip Fit - - 250A 5 A 65mm -5°C 45mm +55°C 40mm 45 x 40 x 65 mm -
RS Stock No. 171-8846
BrandRS PRO
£28.09
Each
Units
100:5 33 x 23mm Base Mounted - - 100A 5 A 106mm +20°C 93mm +70°C 40mm 93 x 40 x 106 mm -
RS Stock No. 171-8834
BrandRS PRO
£43.93
Each
Units
1000:5 38 x 128mm Base Mounted - - 1000A 5 A 170mm -5°C 99mm +55°C 45mm 99 x 45 x 170 mm -
RS Stock No. 171-8804
BrandRS PRO
£21.91
Each
Units
1000:5 41 x 41mm Clip Fit - - 1000A 5 A 98mm -5°C 74mm +55°C 45mm 74 x 45 x 98 mm -
RS Stock No. 171-8841
BrandRS PRO
£22.61
Each
Units
1250:5 101 x 56mm Clip Fit - - 1250A 5 A 170mm -5°C 130mm +55°C 60mm 130 x 60 x 170 mm -
RS Stock No. 171-8786
BrandRS PRO
£10.56
Each
Units
150:5 40 x 11mm Clip Fit - - 150A 5 A 78mm -5°C 62mm +55°C 40mm 62 x 40 x 78 mm -