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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Beskrivning Pris Current Ratio Inner Diameter Transformer Type Overall Height Overall Width Overall Depth Input Current Output Current Minimum Temperature Maximum Temperature Dimensions For Use With Mounting Type Series
RS-artikelnummer 881-7988
Tillv. art.nrCTMAX800
VarumärkeABB
366,84 kr
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- 30mm - - - - - - -5°C +50°C 70 x 111 x 69 mm - BusBar, DIN Rail CT MAX
RS-artikelnummer 881-7957
Tillv. art.nrCTPROXT100SELV
VarumärkeABB
340,88 kr
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- 18mm - - - - - - -5°C +50°C 45 x 96 x 69 mm - BusBar, DIN Rail CT PRO XT SELV
RS-artikelnummer 881-7994
Tillv. art.nrCTMAX400SELV
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427,15 kr
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- 30mm - - - - - - -5°C +50°C 70 x 111 x 69 mm - BusBar, DIN Rail CT MAX SELV
RS-artikelnummer 881-7960
Tillv. art.nrCTPROXT400SELV
VarumärkeABB
393,64 kr
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- 18mm - - - - - - -5°C +50°C 45 x 96 x 69 mm - BusBar, DIN Rail CT PRO XT SELV
RS-artikelnummer 881-7913
Tillv. art.nrCTPROXT60
VarumärkeABB
227,81 kr
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- 18mm - - - - - - -5°C +50°C 45 x 96 x 69 mm - BusBar, DIN Rail CT PRO XT
RS-artikelnummer 291-1227
Tillv. art.nr01.000158.221
VarumärkeABB
488,84 kr
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- 26mm - 82mm 80mm 38mm - - -10°C +60°C - - - -
RS-artikelnummer 881-7963
Tillv. art.nrCTPROXT250SELV
VarumärkeABB
393,64 kr
Each
Enheter
- 18mm - - - - - - -5°C +50°C 45 x 96 x 69 mm - BusBar, DIN Rail CT PRO XT SELV
RS-artikelnummer 881-7935
Tillv. art.nrCTPROXT300
VarumärkeABB
297,33 kr
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- 18mm - - - - - - -5°C +50°C 45 x 96 x 69 mm - BusBar, DIN Rail CT PRO XT
RS-artikelnummer 881-7941
Tillv. art.nrCTPROXT50SELV
VarumärkeABB
288,11 kr
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- 18mm - - - - - - -5°C +50°C 45 x 96 x 69 mm - BusBar, DIN Rail CT PRO XT SELV
RS-artikelnummer 881-7998
Tillv. art.nrCTMAX500SELV
VarumärkeABB
427,15 kr
Each
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- 30mm - - - - - - -5°C +50°C 70 x 111 x 69 mm - BusBar, DIN Rail CT MAX SELV
RS-artikelnummer 291-1233
Tillv. art.nr01.000158.222
VarumärkeABB
488,84 kr
Each
Enheter
- 26mm - 82mm 80mm 38mm - - -10°C +60°C - - - -
RS-artikelnummer 881-7966
Tillv. art.nrCTPROXT300SELV
VarumärkeABB
393,64 kr
Each
Enheter
- 18mm - - - - - - -5°C +50°C 45 x 96 x 69 mm - BusBar, DIN Rail CT PRO XT SELV
RS-artikelnummer 881-7954
Tillv. art.nrCTPROXT200SELV
VarumärkeABB
340,88 kr
Each
Enheter
- 18mm - - - - - - -5°C +50°C 45 x 96 x 69 mm - BusBar, DIN Rail CT PRO XT SELV
RS-artikelnummer 881-7910
Tillv. art.nrCTPROXT100
VarumärkeABB
253,77 kr
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- 18mm - - - - - - -5°C +50°C 45 x 96 x 69 mm - BusBar, DIN Rail CT PRO XT
RS-artikelnummer 881-7976
Tillv. art.nrCTMAX500
VarumärkeABB
332,50 kr
Each
Enheter
- 30mm - - - - - - -5°C +50°C 70 x 111 x 69 mm - BusBar, DIN Rail CT MAX
RS-artikelnummer 881-7922
Tillv. art.nrCTPROXT200
VarumärkeABB
253,77 kr
Each
Enheter
- 18mm - - - - - - -5°C +50°C 45 x 96 x 69 mm - BusBar, DIN Rail CT PRO XT
RS-artikelnummer 881-8001
Tillv. art.nr2CSG226035R1101
VarumärkeABB
427,15 kr
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Enheter
- 30mm - - - - - - -5°C +50°C 70 x 111 x 69 mm - BusBar, DIN Rail CT MAX SELV
RS-artikelnummer 881-7950
Tillv. art.nrCTPROXT150SELV
VarumärkeABB
340,88 kr
Each
Enheter
- 18mm - - - - - - -5°C +50°C 45 x 96 x 69 mm - BusBar, DIN Rail CT PRO XT SELV
RS-artikelnummer 881-7948
Tillv. art.nrCTPROXT80SELV
VarumärkeABB
288,11 kr
Each
Enheter
- 18mm - - - - - - -5°C +50°C 45 x 96 x 69 mm - BusBar, DIN Rail CT PRO XT SELV
RS-artikelnummer 881-7985
Tillv. art.nrCTMAX600
VarumärkeABB
332,50 kr
Each
Enheter
- 30mm - - - - - - -5°C +50°C 70 x 111 x 69 mm - BusBar, DIN Rail CT MAX