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. 171-8805
FabrikantRS PRO
27,19 €
Each
Aantal stuks
1000:5 61 x 51mm Clip Fit - - 1000A 5 A 110mm -5°C 86mm +55°C 45mm 86 x 45 x 110 mm -
RS-stocknr. 171-8762
FabrikantRS PRO
12,76 €
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Aantal stuks
300:5 21 x 10mm Clip Fit - - 300A 5 A 65mm -5°C 45mm +55°C 40mm 45 x 40 x 65 mm -
RS-stocknr. 173-0041
FabrikantRS PRO
1,004 €
Each (In a Box of 351)
Aantal stuks
15:1 - - - - 15A - - -40°C - +120°C - 17.2 x 9.53 x 20.4 mm -
RS-stocknr. 171-8782
FabrikantRS PRO
18,69 €
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Aantal stuks
125:5 30 x 11mm Clip Fit - - 125A 5 A 78mm -5°C 62mm +55°C 40mm 62 x 40 x 78 mm -
RS-stocknr. 171-8802
FabrikantRS PRO
28,71 €
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Aantal stuks
800:5 41 x 41mm Clip Fit - - 800A 5 A 98mm -5°C 74mm +55°C 45mm 74 x 45 x 98 mm -
RS-stocknr. 171-8777
FabrikantRS PRO
12,29 €
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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. 171-8800
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27,65 €
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500:5 41 x 41mm Clip Fit - - 500A 5 A 98mm -5°C 74mm +55°C 45mm 74 x 45 x 98 mm -
RS-stocknr. 171-8763
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10,49 €
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80:5 30 x 10mm Clip Fit - - 80A 5 A 70mm -5°C 50mm +55°C 31mm 50 x 31 x 70 mm -
RS-stocknr. 171-8756
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12,76 €
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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. 171-8820
FabrikantRS PRO
37,06 €
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1600:5 100 x 30mm Clip Fit - - 1600A 5 A 155mm -5°C 140mm +55°C 45mm 140 x 45 x 155 mm -
RS-stocknr. 171-8811
FabrikantRS PRO
31,13 €
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800:5 80 x 12mm Clip Fit - - 800A 5 A 126mm -5°C 104mm +55°C 45mm 104 x 45 x 126 mm -
RS-stocknr. 173-0236
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1,638 €
Each (In a Box of 351)
Aantal stuks
15:1 - - - - 15A - - -40°C - +120°C - 17.2 x 9.53 x 20.4 mm -
RS-stocknr. 171-8783
FabrikantRS PRO
18,99 €
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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. 171-8852
FabrikantRS PRO
56,21 €
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500:5 55 x 43mm Base Mounted - - 500A 5 A 125mm +20°C 108mm +70°C 51mm 108 x 51 x 125 mm -
RS-stocknr. 171-8851
FabrikantRS PRO
47,09 €
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400:5 33 x 23mm Base Mounted - - 400A 5 A 106mm +20°C 93mm +70°C 40mm 93 x 40 x 106 mm -
RS-stocknr. 171-8850
FabrikantRS PRO
45,57 €
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300:5 33 x 23mm Base Mounted - - 300A 5 A 106mm +20°C 93mm +70°C 40mm 93 x 40 x 106 mm -
RS-stocknr. 171-8758
FabrikantRS PRO
12,76 €
Each
Aantal stuks
150:5 21 x 10mm Clip Fit - - 150A 5 A 65mm -5°C 45mm +55°C 40mm 45 x 40 x 65 mm -
RS-stocknr. 171-8749
FabrikantRS PRO
17,47 €
Each
Aantal stuks
50:1 21 x 10mm - - - - - 65mm - 45mm - 40mm 45 x 40 x 65 mm -
RS-stocknr. 171-8779
FabrikantRS PRO
14,43 €
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Aantal stuks
600:5 30 x 10mm Clip Fit - - 600A 5 A 70mm -5°C 50mm +55°C 31mm 50 x 31 x 70 mm -
RS-stocknr. 171-8760
FabrikantRS PRO
12,76 €
Each
Aantal stuks
200:5 21 x 10mm Clip Fit - - 200A 5 A 65mm -5°C 45mm +55°C 40mm 45 x 40 x 65 mm -
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