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 Prix 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
N° de stock RS 173-0235
MarqueRS PRO
3,49 €
Each (In a Box of 351)
Unité
1000:1 5mm - - - 10A - - -40°C - +120°C - 17.2 x 9.53 x 20.4 mm -
N° de stock RS 124-3900
MarqueRS PRO
3,86 €
Each
Unité
1000:1 5mm - - - 10A - - -40°C - +120°C - 17.2 x 9.53 x 20.4 mm -
N° de stock RS 171-8809
MarqueRS PRO
27,96 €
Each
Unité
1500:5 61 x 51mm Clip Fit - - 1500A 5 A 110mm -5°C 86mm +55°C 45mm 86 x 45 x 110 mm -
N° de stock RS 124-3880
MarqueRS PRO
1,22 €
Each
Unité
300:1 5mm - - - 15A - - -40°C - +120°C - 17.2 x 9.53 x 20.4 mm -
N° de stock RS 171-8753
MarqueRS PRO
12,01 €
Each
Unité
80:5 21 x 10mm Clip Fit - - 80A 5 A 65mm -5°C 45mm +55°C 40mm 45 x 40 x 65 mm -
N° de stock RS 171-8830
MarqueRS PRO
30,39 €
Each
Unité
250:5 45mm Base Mounted - - 250A 5 A 102.5mm - 141mm - 38mm 141 x 38 x 102.5 mm MCCB
N° de stock RS 171-8781
MarqueRS PRO
18,69 €
Each
Unité
100:5 30 x 11mm Clip Fit - - 100A 5 A 78mm -5°C 62mm +55°C 40mm 62 x 40 x 78 mm -
N° de stock RS 171-8761
MarqueRS PRO
12,76 €
Each
Unité
250:5 21 x 10mm Clip Fit - - 250A 5 A 65mm -5°C 45mm +55°C 40mm 45 x 40 x 65 mm -
N° de stock RS 171-8790
MarqueRS PRO
21,26 €
Each
Unité
400:1 40 x 11mm - - - - - 78mm - 62mm - 40mm 62 x 40 x 78 mm -
N° de stock RS 171-8810
MarqueRS PRO
27,96 €
Each
Unité
1500:5 61 x 51mm Clip Fit - - 1500A 5 A 110mm -5°C 86mm +55°C 45mm 86 x 45 x 110 mm -
N° de stock RS 124-3881
MarqueRS PRO
2,35 €
Each
Unité
500:1 5mm - - - 15A - - -40°C - +120°C - 17.2 x 9.53 x 20.4 mm -
N° de stock RS 171-8758
MarqueRS PRO
12,76 €
Each
Unité
150:5 21 x 10mm Clip Fit - - 150A 5 A 65mm -5°C 45mm +55°C 40mm 45 x 40 x 65 mm -
N° de stock RS 171-8854
MarqueRS PRO
56,21 €
Each
Unité
600:5 55 x 43mm Base Mounted - - 600A 5 A 125mm +20°C 108mm +70°C 51mm 108 x 51 x 125 mm -
N° de stock RS 171-8749
MarqueRS PRO
17,47 €
Each
Unité
50:1 21 x 10mm - - - - - 65mm - 45mm - 40mm 45 x 40 x 65 mm -
N° de stock RS 171-8793
MarqueRS PRO
21,26 €
Each
Unité
400:1 40 x 11mm - - - - - 78mm - 62mm - 40mm 62 x 40 x 78 mm -
N° de stock RS 171-8814
MarqueRS PRO
33,43 €
Each
Unité
1250:5 80 x 12mm Clip Fit - - 1250A 5 A 126mm -5°C 104mm +55°C 45mm 104 x 45 x 126 mm -
N° de stock RS 171-8835
MarqueRS PRO
62,45 €
Each
Unité
1250:5 38 x 128mm Base Mounted - - 1250A 5 A 170mm -5°C 99mm +55°C 45mm 99 x 45 x 170 mm -
N° de stock RS 171-8754
MarqueRS PRO
17,47 €
Each
Unité
100:1 21 x 10mm - - - - - 65mm - 45mm - 40mm 45 x 40 x 65 mm -
N° de stock RS 171-8831
MarqueRS PRO
30,39 €
Each
Unité
300:5 45mm Base Mounted - - 300A 5 A 102.5mm - 141mm - 38mm 141 x 38 x 102.5 mm MCCB
N° de stock RS 171-8782
MarqueRS PRO
18,69 €
Each
Unité
125:5 30 x 11mm Clip Fit - - 125A 5 A 78mm -5°C 62mm +55°C 40mm 62 x 40 x 78 mm -