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. 833-2875
Mfr. Part No.2CCA880100R0001 CMS-100PS
BrandABB
£84.44
Each
Units
80:1 10mm - - 690 V ac, 1500 V dc 80A - 27.8mm -25°C 41mm +70°C 41mm - -
RS Stock No. 881-7904
Mfr. Part No.2CSG225755R1101 CT PRO XT 50
BrandABB
£19.19
Each
Units
- 18mm - - - - - - -5°C - +50°C - 45 x 96 x 69 mm -
RS Stock No. 291-1233
Mfr. Part No.01.000158.222
BrandABB
£63.06
Each
Units
- 26mm - - - - - 82mm -10°C 80mm +60°C 38mm - -
RS Stock No. 291-1227
Mfr. Part No.01.000158.221
BrandABB
£63.06
Each
Units
- 26mm - - - - - 82mm -10°C 80mm +60°C 38mm - -
RS Stock No. 833-2879
Mfr. Part No.2CCA880124R0001 CMS-100S8
BrandABB
£68.32
Each
Units
80:1 10mm - - 690 V ac, 1500 V dc 80A - 31.8mm -25°C 45.5mm +70°C 45.5mm - -
RS Stock No. 881-7988
Mfr. Part No.CTMAX800
BrandABB
£30.09
Each
Units
- 30mm - - - - - - -5°C - +50°C - 70 x 111 x 69 mm -
RS Stock No. 833-2888
Mfr. Part No.2CCA880117R0001 CMS-200CA
BrandABB
£96.57
Each
Units
160:1 15mm - - 690 V ac, 1500 V dc 160A - 35.65mm -25°C 43mm +70°C 43mm - -
RS Stock No. 881-7938
Mfr. Part No.CTPROXT400
BrandABB
£26.75
Each
Units
- 18mm - - - - - - -5°C - +50°C - 45 x 96 x 69 mm -
RS Stock No. 881-7960
Mfr. Part No.CTPROXT400SELV
BrandABB
£32.11
Each
Units
- 18mm - - - - - - -5°C - +50°C - 45 x 96 x 69 mm -
RS Stock No. 881-7972
Mfr. Part No.2CSG225955R1101 CT MAX 400
BrandABB
£30.09
Each
Units
- 30mm - - - - - - -5°C - +50°C - 70 x 111 x 69 mm -
RS Stock No. 881-8008
Mfr. Part No.CTMAX1000SELV
BrandABB
£36.12
Each
Units
- 30mm - - - - - - -5°C - +50°C - 70 x 111 x 69 mm -
RS Stock No. 881-7926
Mfr. Part No.2CSG225815R1101 CT PRO XT 250
BrandABB
£22.32
Each
Units
- 18mm - - - - - - -5°C - +50°C - 45 x 96 x 69 mm -
RS Stock No. 833-2863
Mfr. Part No.2CCA880107R0001 CMS-100CA
BrandABB
£58.62
Each
Units
80:1 10mm - - 690 V ac, 1500 V dc 80A - 29mm -25°C 41mm +70°C 41mm - -
RS Stock No. 881-7963
Mfr. Part No.CTPROXT250SELV
BrandABB
£26.75
Each
Units
- 18mm - - - - - - -5°C - +50°C - 45 x 96 x 69 mm -
RS Stock No. 881-7932
Mfr. Part No.2CSG225845R1101 CT PRO XT 40 SELV
BrandABB
£22.98
Each
Units
- 18mm - - - - - - -5°C - +50°C - 45 x 96 x 69 mm -
RS Stock No. 881-7900
Mfr. Part No.2CSG225745R1101 CT PRO XT 40
BrandABB
£19.19
Each
Units
- 18mm - - - - - - -5°C - +50°C - 45 x 96 x 69 mm -
RS Stock No. 881-7916
Mfr. Part No.2CSG225775R1101 CT PRO XT 80
BrandABB
£18.17
Each
Units
- 18mm - - - - - - -5°C - +50°C - 45 x 96 x 69 mm -
RS Stock No. 881-7985
Mfr. Part No.CTMAX600
BrandABB
£26.51
Each
Units
- 30mm - - - - - - -5°C - +50°C - 70 x 111 x 69 mm -
RS Stock No. 881-7982
Mfr. Part No.2CSG225995R1101 CT MAX 1000
BrandABB
£30.09
Each
Units
- 30mm - - - - - - -5°C - +50°C - 70 x 111 x 69 mm -
RS Stock No. 833-2881
Mfr. Part No.2CCA880132R0001 CMS-200DR
BrandABB
£109.11
Each
Units
160:1 15mm - - 690 V ac, 1500 V dc 160A - 43.2mm -25°C 50.1mm +70°C 50.1mm - -