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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Omschrijving Prijs 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-stocknr. 173-0235
FabrikantRS PRO
3,49 €
Each (In a Box of 351)
Aantal stuks
1000:1 5mm - - - 10A - - -40°C - +120°C - 17.2 x 9.53 x 20.4 mm -
RS-stocknr. 124-3900
FabrikantRS PRO
3,86 €
Each
Aantal stuks
1000:1 5mm - - - 10A - - -40°C - +120°C - 17.2 x 9.53 x 20.4 mm -
RS-stocknr. 171-8750
FabrikantRS PRO
12,01 €
Each
Aantal stuks
50:5 21 x 10mm Clip Fit - - 50A 5 A 65mm -5°C 45mm +55°C 40mm 45 x 40 x 65 mm -
RS-stocknr. 171-8812
FabrikantRS PRO
32,65 €
Each
Aantal stuks
1000:5 80 x 12mm Clip Fit - - 1000A 5 A 126mm -5°C 104mm +55°C 45mm 104 x 45 x 126 mm -
RS-stocknr. 171-8783
FabrikantRS PRO
18,99 €
Each
Aantal stuks
150:5 30 x 11mm Clip Fit - - 150A 5 A 78mm -5°C 62mm +55°C 40mm 62 x 40 x 78 mm -
RS-stocknr. 124-3883
FabrikantRS PRO
1,84 €
Each
Aantal stuks
50:1 8mm - - - 50A - - -40°C - +120°C - 32 x 20.5 x 35 mm -
RS-stocknr. 171-8751
FabrikantRS PRO
12,01 €
Each
Aantal stuks
60:5 21 x 10mm Clip Fit - - 60A 5 A 65mm -5°C 45mm +55°C 40mm 45 x 40 x 65 mm -
RS-stocknr. 171-8813
FabrikantRS PRO
29,61 €
Each
Aantal stuks
1200:5 80 x 12mm Clip Fit - - 1200A 5 A 126mm -5°C 104mm +55°C 45mm 104 x 45 x 126 mm -
RS-stocknr. 171-8756
FabrikantRS PRO
12,76 €
Each
Aantal stuks
125:5 21 x 10mm Clip Fit - - 125A 5 A 65mm -5°C 45mm +55°C 40mm 45 x 40 x 65 mm -
RS-stocknr. 171-8833
FabrikantRS PRO
30,39 €
Each
Aantal stuks
600:5 45mm Base Mounted - - 600A 5 A 102.5mm - 141mm - 38mm 141 x 38 x 102.5 mm MCCB
RS-stocknr. 171-8793
FabrikantRS PRO
21,26 €
Each
Aantal stuks
400:1 40 x 11mm - - - - - 78mm - 62mm - 40mm 62 x 40 x 78 mm -
RS-stocknr. 171-8834
FabrikantRS PRO
59,41 €
Each
Aantal stuks
1000:5 38 x 128mm Base Mounted - - 1000A 5 A 170mm -5°C 99mm +55°C 45mm 99 x 45 x 170 mm -
RS-stocknr. 171-8784
FabrikantRS PRO
19,59 €
Each
Aantal stuks
300:5 30 x 11mm Clip Fit - - 300A 5 A 78mm -5°C 62mm +55°C 40mm 62 x 40 x 78 mm -
RS-stocknr. 171-8761
FabrikantRS PRO
12,76 €
Each
Aantal stuks
250:5 21 x 10mm Clip Fit - - 250A 5 A 65mm -5°C 45mm +55°C 40mm 45 x 40 x 65 mm -
RS-stocknr. 171-8857
FabrikantRS PRO
18,84 €
Each
Aantal stuks
15:5 62 x 40mm Clip Fit - - 15A 5 A 78mm -5°C 62mm +55°C 40mm 62 x 40 x 78 mm -
RS-stocknr. 171-8753
FabrikantRS PRO
12,01 €
Each
Aantal stuks
80:5 21 x 10mm Clip Fit - - 80A 5 A 65mm -5°C 45mm +55°C 40mm 45 x 40 x 65 mm -
RS-stocknr. 171-8764
FabrikantRS PRO
15,95 €
Each
Aantal stuks
100:1 30 x 10mm - - - - - 70mm - 50mm - 30mm 50 x 30 x 70 mm -
RS-stocknr. 171-8777
FabrikantRS PRO
12,29 €
Each
Aantal stuks
400:5 30 x 10mm Clip Fit - - 400A 5 A 70mm -5°C 50mm +55°C 31mm 50 x 31 x 70 mm -
RS-stocknr. 171-8757
FabrikantRS PRO
18,22 €
Each
Aantal stuks
- - - - - - - - - - - - - -
RS-stocknr. 171-8785
FabrikantRS PRO
14,28 €
Each
Aantal stuks
100:5 40 x 11mm Clip Fit - - 100A 5 A 78mm -5°C 62mm +55°C 40mm 62 x 40 x 78 mm -