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. 173-0198
BrandRS PRO
kr 22,013
Each (In a Box of 176)
Units
1000:1 11.4mm - - - 75A - - -55°C - +130°C - 30.2 x 14.3 x 30.2 mm -
RS Stock No. 173-0219
BrandRS PRO
kr 41,372
Each (In a Box of 18)
Units
1000:1 23.8mm - - - 500A - - -55°C - +130°C - 55.6 x 20.6 x 55.6 mm -
RS Stock No. 173-0199
BrandRS PRO
kr 28,616
Each (In a Box of 133)
Units
1000:1 14.6mm - - - 125A - - -55°C - +130°C - 34.9 x 14.3 x 34.9 mm -
RS Stock No. 124-3890
BrandRS PRO
kr 31,85
Each
Units
1000:1 14.6mm - - - 125A - - -55°C - +130°C - 34.9 x 14.3 x 34.9 mm -
RS Stock No. 124-3895
BrandRS PRO
kr 53,70
Each
Units
1000:1 23.8mm - - - 200A - - -55°C - +130°C - 55.6 x 20.6 x 55.6 mm -
RS Stock No. 124-3889
BrandRS PRO
kr 20,22
Each
Units
1000:1 11.4mm - - - 75A - - -55°C - +130°C - 30.2 x 14.3 x 30.2 mm -
RS Stock No. 171-8808
BrandRS PRO
kr 333,30
Each
Units
1500:1 61 x 51mm - - - - - 110mm - 86mm - 45mm 86 x 45 x 110 mm -
RS Stock No. 171-8809
BrandRS PRO
kr 278,76
Each
Units
1500:5 61 x 51mm Clip Fit - - 1500A 5 A 110mm -5°C 86mm +55°C 45mm 86 x 45 x 110 mm -
RS Stock No. 173-0215
BrandRS PRO
kr 19,517
Each (In a Box of 351)
Units
500:1 5mm - - - 5A - - -40°C - +120°C - 17.2 x 9.53 x 20.4 mm -
RS Stock No. 171-8850
BrandRS PRO
kr 477,05
Each
Units
300:5 33 x 23mm Base Mounted - - 300A 5 A 106mm +20°C 93mm +70°C 40mm 93 x 40 x 106 mm -
RS Stock No. 171-8763
BrandRS PRO
kr 109,82
Each
Units
80:5 30 x 10mm Clip Fit - - 80A 5 A 70mm -5°C 50mm +55°C 31mm 50 x 31 x 70 mm -
RS Stock No. 171-8753
BrandRS PRO
kr 125,73
Each
Units
80:5 21 x 10mm Clip Fit - - 80A 5 A 65mm -5°C 45mm +55°C 40mm 45 x 40 x 65 mm -
RS Stock No. 171-8846
BrandRS PRO
kr 397,70
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. 171-8802
BrandRS PRO
kr 300,55
Each
Units
800:5 41 x 41mm Clip Fit - - 800A 5 A 98mm -5°C 74mm +55°C 45mm 74 x 45 x 98 mm -
RS Stock No. 171-8784
BrandRS PRO
kr 195,31
Each
Units
300:5 30 x 11mm Clip Fit - - 300A 5 A 78mm -5°C 62mm +55°C 40mm 62 x 40 x 78 mm -
RS Stock No. 171-8810
BrandRS PRO
kr 278,76
Each
Units
1500:5 61 x 51mm Clip Fit - - 1500A 5 A 110mm -5°C 86mm +55°C 45mm 86 x 45 x 110 mm -
RS Stock No. 171-8818
BrandRS PRO
kr 369,49
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. 171-8758
BrandRS PRO
kr 127,22
Each
Units
150:5 21 x 10mm Clip Fit - - 150A 5 A 65mm -5°C 45mm +55°C 40mm 45 x 40 x 65 mm -
RS Stock No. 171-8787
BrandRS PRO
kr 149,49
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. 124-3903
BrandRS PRO
kr 19,57
Each
Units
1000:1 5mm - - - 120A - - -40°C - +85°C - 17.2 x 9.53 x 20.4 mm -