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 Inner Diameter Transformer Type Overall Height Overall Width Input Current Overall Depth Output Current Minimum Temperature Maximum Temperature Dimensions For Use With Mounting Type Series
RS-stocknr. 173-0235
FabrikantRS PRO
3,474 €
Each (In a Box of 351)
Aantal stuks
- - - - - 10A - - -40°C +120°C 17.2 x 9.53 x 20.4 mm - PCB Mount -
RS-stocknr. 124-3900
FabrikantRS PRO
3,64 €
Each
Aantal stuks
- - - - - 10A - - -40°C +120°C 17.2 x 9.53 x 20.4 mm - PCB Mount -
RS-stocknr. 171-8840
FabrikantRS PRO
59,41 €
Each
Aantal stuks
1000:5 101 x 56mm Clip Fit 170mm 130mm 1kA 60mm 5 A -5°C +55°C 130 x 60 x 170 mm - Surface Mount -
RS-stocknr. 173-0215
FabrikantRS PRO
1,762 €
Each (In a Box of 351)
Aantal stuks
- - - - - 5A - - -40°C +120°C 17.2 x 9.53 x 20.4 mm - PCB Mount -
RS-stocknr. 171-8841
FabrikantRS PRO
62,45 €
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Aantal stuks
1250:5 101 x 56mm Clip Fit 170mm 130mm 1.25kA 60mm 5 A -5°C +55°C 130 x 60 x 170 mm - Surface Mount -
RS-stocknr. 124-3890
FabrikantRS PRO
2,88 €
Each
Aantal stuks
- - - - - 40 → 125A - - -55°C +130°C 34.9 x 14.3 x 34.9 mm - PCB Mount -
RS-stocknr. 171-8790
FabrikantRS PRO
21,26 €
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Aantal stuks
400:1 40 x 11mm - 78mm 62mm - 40mm - - - 62 x 40 x 78 mm - - -
RS-stocknr. 171-8834
FabrikantRS PRO
59,41 €
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Aantal stuks
1000:5 38 x 128mm Base Mounted 170mm 99mm 1kA 45mm 5 A -5°C +55°C 99 x 45 x 170 mm - Surface Mount -
RS-stocknr. 171-8808
FabrikantRS PRO
33,43 €
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1500:1 61 x 51mm - 110mm 86mm - 45mm - - - 86 x 45 x 110 mm - - -
RS-stocknr. 171-8852
FabrikantRS PRO
56,21 €
Each
Aantal stuks
500:5 55 x 43mm Base Mounted 125mm 108mm 500A 51mm 5 A +20°C +70°C 108 x 51 x 125 mm - Surface Mount -
RS-stocknr. 171-8850
FabrikantRS PRO
45,57 €
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300:5 33 x 23mm Base Mounted 106mm 93mm 300A 40mm 5 A +20°C +70°C 93 x 40 x 106 mm - Surface Mount -
RS-stocknr. 171-8797
FabrikantRS PRO
21,26 €
Each
Aantal stuks
- - - - - - - - - - - - - -
RS-stocknr. 171-8835
FabrikantRS PRO
62,45 €
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Aantal stuks
1250:5 38 x 128mm Base Mounted 170mm 99mm 1.25kA 45mm 5 A -5°C +55°C 99 x 45 x 170 mm - Surface Mount -
RS-stocknr. 171-8770
FabrikantRS PRO
16,26 €
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200:1 30 x 10mm - 70mm 50mm - 30mm - - - 50 x 30 x 70 mm - - -
RS-stocknr. 173-0218
FabrikantRS PRO
1,883 €
Each (In a Box of 25)
Aantal stuks
- - - - - 100 → 250A - - -55°C +130°C 44.5 x 14.3 x 44.5 mm - PCB Mount -
RS-stocknr. 171-8802
FabrikantRS PRO
28,71 €
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800:5 41 x 41mm Clip Fit 98mm 74mm 800A 45mm 5 A -5°C +55°C 74 x 45 x 98 mm - Surface Mount -
RS-stocknr. 171-8788
FabrikantRS PRO
14,28 €
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Aantal stuks
250:5 40 x 11mm Clip Fit 78mm 62mm 250A 40mm 5 A -5°C +55°C 62 x 40 x 78 mm - Surface Mount -
RS-stocknr. 171-8851
FabrikantRS PRO
47,09 €
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Aantal stuks
400:5 33 x 23mm Base Mounted 106mm 93mm 400A 40mm 5 A +20°C +70°C 93 x 40 x 106 mm - Surface Mount -
RS-stocknr. 173-0216
FabrikantRS PRO
3,104 €
Each (In a Box of 351)
Aantal stuks
- - - - - 7.5A - - -40°C +120°C 17.2 x 9.53 x 20.4 mm - PCB Mount -
RS-stocknr. 171-8842
FabrikantRS PRO
72,78 €
Each
Aantal stuks
1500:5 101 x 56mm Clip Fit 170mm 130mm 1.5kA 60mm 5 A -5°C +55°C 130 x 60 x 170 mm - Surface Mount -
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