Current Transformers

Current transformers (CT) are devices that are used to transform the current from a high current into a lower current so that the power can then be measured and controlled. The transformers consist of a core, a primary and a secondary winding. 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.


Current transformers can perform circuit control and perform roles for safety protection and current limiting.


Current transformers are found in:


  • Generating stations,

  • Electrical substations

  • Commercial electric power distribution.

Types of Current Transformers


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.


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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. 171-8792
FabrikantRS PRO
14,90 €
Each
Aantal stuks
500:5 40 x 11mm Clip Fit - - 500A 5 A 78mm -5°C 62mm +55°C 40mm 62 x 40 x 78 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. 171-8836
FabrikantRS PRO
72,78 €
Each
Aantal stuks
1500:5 38 x 128mm Base Mounted - - 1500A 5 A 170mm -5°C 99mm +55°C 45mm 99 x 45 x 170 mm -
RS-stocknr. 171-8818
FabrikantRS PRO
37,06 €
Each
Aantal stuks
1500:5 100 x 30mm Clip Fit - - 1500A 5 A 155mm -5°C 140mm +55°C 45mm 140 x 45 x 155 mm -
RS-stocknr. 171-8856
FabrikantRS PRO
18,84 €
Each
Aantal stuks
10:5 62 x 40mm Clip Fit - - 10A 5 A 78mm -5°C 62mm +55°C 40mm 62 x 40 x 78 mm -
RS-stocknr. 173-0197
FabrikantRS PRO
1,352 €
Each (In a Box of 176)
Aantal stuks
75:1 - - - - 75A - - -55°C - +130°C - 30.2 x 14.3 x 30.2 mm -
RS-stocknr. 171-8823
FabrikantRS PRO
49,85 €
Each
Aantal stuks
3000:5 100 x 30mm Clip Fit - - 3000A 5 A 155mm -5°C 140mm +55°C 45mm 140 x 45 x 155 mm -
RS-stocknr. 173-0198
FabrikantRS PRO
3,706 €
Each (In a Box of 176)
Aantal stuks
375:1 - - - - 375A - - -55°C - +130°C - 30.2 x 14.3 x 30.2 mm -
RS-stocknr. 171-8750
FabrikantRS PRO
12,01 €
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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. 124-3897
FabrikantRS PRO
3,66 €
Each
Aantal stuks
50:1 - - - - 50A - - -40°C - +85°C - 19 x 11.5 x 21.5 mm -
RS-stocknr. 171-8832
FabrikantRS PRO
30,39 €
Each
Aantal stuks
400:5 45mm Base Mounted - - 400A 5 A 102.5mm - 141mm - 38mm 141 x 38 x 102.5 mm MCCB
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. 171-8784
FabrikantRS PRO
19,59 €
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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. 171-8843
FabrikantRS PRO
73,69 €
Each
Aantal stuks
1600:5 101 x 56mm Clip Fit - - 1600A 5 A 170mm -5°C 130mm +55°C 60mm 130 x 60 x 170 mm -
RS-stocknr. 171-8814
FabrikantRS PRO
33,43 €
Each
Aantal stuks
1250:5 80 x 12mm Clip Fit - - 1250A 5 A 126mm -5°C 104mm +55°C 45mm 104 x 45 x 126 mm -
RS-stocknr. 171-8790
FabrikantRS PRO
21,26 €
Each
Aantal stuks
400:1 40 x 11mm - - - - - 78mm - 62mm - 40mm 62 x 40 x 78 mm -
RS-stocknr. 171-8794
FabrikantRS PRO
14,90 €
Each
Aantal stuks
600:5 40 x 11mm Clip Fit - - 600A 5 A 78mm -5°C 62mm +55°C 40mm 62 x 40 x 78 mm -
RS-stocknr. 171-8772
FabrikantRS PRO
16,57 €
Each
Aantal stuks
250:1 30 x 10mm - - - - - 70mm - 50mm - 30mm 50 x 30 x 70 mm -
RS-stocknr. 171-8827
FabrikantRS PRO
25,82 €
Each
Aantal stuks
160:5 35mm Base Mounted - - 160A 5 A 87.5mm - 105mm - 38mm 105 x 38 x 87.5 mm MCCB
RS-stocknr. 171-8848
FabrikantRS PRO
37,99 €
Each
Aantal stuks
200:5 33 x 23mm Base Mounted - - 200A 5 A 106mm +20°C 93mm +70°C 40mm 93 x 40 x 106 mm -
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