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 Overall Width Overall Depth Minimum Temperature Maximum Temperature Mounting Type Series
RS Stock No. 173-0219
BrandRS PRO
kr 54,623
Each (In a Box of 18)
Units
1000:1 23.8mm - - - 500A - - 20.6mm 55.6mm -55°C +130°C PCB Mount -
RS Stock No. 124-3895
BrandRS PRO
kr 71,10
Each
Units
1000:1 23.8mm - - - 200A - - 20.6mm 55.6mm -55°C +130°C PCB Mount -
RS Stock No. 173-0198
BrandRS PRO
kr 26,099
Each (In a Box of 176)
Units
1000:1 11.4mm - - - 75A - - 14.3mm 30.2mm -55°C +130°C PCB Mount -
RS Stock No. 173-0199
BrandRS PRO
kr 36,183
Each (In a Box of 133)
Units
1000:1 14.6mm - - - 125A - - 14.3mm 34.9mm -55°C +130°C PCB Mount -
RS Stock No. 124-3890
BrandRS PRO
kr 40,12
Each
Units
1000:1 14.6mm - - - 125A - - 14.3mm 34.9mm -55°C +130°C PCB Mount -
RS Stock No. 124-3889
BrandRS PRO
kr 24,79
Each
Units
1000:1 11.4mm - - - 75A - - 14.3mm 30.2mm -55°C +130°C PCB Mount -
RS Stock No. 171-8813
BrandRS PRO
kr 333,21
Each
Units
1200:5 80 x 12mm Base Mounted - - 1200A 5 A 126mm 104mm 45mm -5°C +55°C Surface Mount -
RS Stock No. 171-8823
BrandRS PRO
kr 560,86
Each
Units
3000:5 100 x 30mm Base Mounted - - 3000A 5 A 155mm 140mm 45mm -5°C +55°C Surface Mount -
RS Stock No. 171-8814
BrandRS PRO
kr 376,15
Each
Units
1250:5 80 x 12mm Base Mounted - - 1250A 5 A 126mm 104mm 45mm -5°C +55°C Surface Mount -
RS Stock No. 171-8815
BrandRS PRO
kr 393,22
Each
Units
1500:5 80 x 12mm Base Mounted - - 1500A 5 A 126mm 104mm 45mm -5°C +55°C Surface Mount -
RS Stock No. 171-8854
BrandRS PRO
kr 657,83
Each
Units
600:5 55 x 43mm Base Mounted - - 600A 5 A 125mm 108mm 51mm +20°C +70°C Surface Mount -
RS Stock No. 173-0044
BrandRS PRO
kr 14,905
Each (In a Box of 351)
Units
300:1 5mm - - - 15A - - 9.53mm 20.4mm -40°C +120°C PCB Mount -
RS Stock No. 171-8751
BrandRS PRO
kr 122,85
Each
Units
60:5 21 x 10mm Base Mounted - - 60A 5 A 65mm 7.2mm 40mm -5°C +55°C Surface Mount -
RS Stock No. 171-8820
BrandRS PRO
kr 417,03
Each
Units
1600:5 100 x 30mm Base Mounted - - 1600A 5 A 155mm 140mm 45mm -5°C +55°C Surface Mount -
RS Stock No. 171-8855
BrandRS PRO
kr 222,54
Each
Units
5:5 62 x 40mm Base Mounted - - 5A 5 A 78mm 62mm 40mm -5°C +55°C Surface Mount -
RS Stock No. 171-8840
BrandRS PRO
kr 668,48
Each
Units
1000:5 101 x 56mm Base Mounted - - 1000A 5 A 170mm 130mm 60mm -5°C +55°C Surface Mount -
RS Stock No. 171-8790
BrandRS PRO
kr 241,79
Each
Units
400:1 40 x 11mm - - - - - 78mm 62mm 40mm - - - -
RS Stock No. 173-0045
BrandRS PRO
kr 27,534
Each (In a Box of 351)
Units
500:1 5mm - - - 15A - - 9.53mm 20.4mm -40°C +120°C PCB Mount -
RS Stock No. 171-8808
BrandRS PRO
kr 325,71
Each
Units
1500:1 61 x 51mm - - - - - 110mm 86mm 45mm - - - -
RS Stock No. 124-3893
BrandRS PRO
kr 35,22
Each
Units
1000:1 14.6mm - - - 200A - - 15.9mm 38.1mm -55°C +130°C PCB Mount -