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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N° de stock RS 123-9539
Référence fabricant7KT1200
MarqueSiemens
146,70 €
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60:5 13mm Straight Through - - - 60A 5 A - - 105 x 71 x 90 mm - Panel Mount 7KT12
N° de stock RS 881-7910
Référence fabricantCTPROXT100
MarqueABB
27,27 €
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- 18mm - - - - - - -5°C +50°C 45 x 96 x 69 mm - BusBar, DIN Rail CT PRO XT
N° de stock RS 537-4520
Référence fabricantAC-1020
2,984 €
Each (In a Pack of 5)
Unité
- - - - - - 20A - -40°C +120°C 23.8 x 23.8 x 11.12 mm - PCB Mount -
N° de stock RS 173-0067
Référence fabricantAZ-0750
4,458 €
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Unité
- - - - - - 40A - -40°C +85°C 19.0 x 11.5 x 21.5 mm - Flying Lead -
N° de stock RS 537-4485
Référence fabricantAC-1005
2,984 €
Each (In a Pack of 5)
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- - - - - - 5A - -40°C +120°C 23.8 x 23.8 x 11.12 mm - PCB Mount -
N° de stock RS 668-4055
Référence fabricantCT105F150/5-2.5/1
MarqueHOBUT
40,72 €
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150:5 21mm Base Mounted 79mm 105mm 53mm - - -30°C +80°C - - - -
N° de stock RS 173-0057
Référence fabricantAX-1000
2,636 €
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Unité
- - - - - - 10A - -40°C +120°C 12.7 x 17 x 9.53 mm - Through Hole -
N° de stock RS 913-9734
Référence fabricantMETSECT5CC013
33,64 €
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125:5 21mm Toroidal Ring - - - - - -25°C +60°C 65 x 44 x 30 mm - DIN Rail -
N° de stock RS 775-4928
Référence fabricantAX-1000
2,96 €
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- - - - - - 10A - -40°C +120°C 12.7 x 17 x 9.53 mm - Through Hole -
N° de stock RS 715-7077
Référence fabricant56T100C
1,38 €
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- - - - - - 10A - -40°C +85°C 16.79 x 8.89 x 20.19 mm - Through Hole -
N° de stock RS 399-7244
Référence fabricantASM-010
4,25 €
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- - - - - - 10A - -40°C +120°C 20.4 x 17.2 x 9.53 mm - PCB Mount -
N° de stock RS 331-519
Référence fabricantCT143M100/5-2.5/1-001
MarqueHOBUT
15,77 €
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100:5 24mm DIN Rail Mounted 70mm 49mm 45mm - - -30°C +85°C - - - -
N° de stock RS 397-9117
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32,57 €
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- 35mm - 74mm 64mm 40mm - - -20°C +60°C - Broyce Type A Earth Leakage Relays Surface Mount BZCT
N° de stock RS 331-480
Référence fabricantCTSCM40600/5-5/1
MarqueHOBUT
49,22 €
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600:5 - Clip Fit 104.5mm 116mm 35.5mm - - -30°C +80°C - - - -
N° de stock RS 913-9731
Référence fabricantMETSECT5CC005
29,82 €
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50:5 21mm Toroidal Ring - - - - - -25°C +60°C 65 x 44 x 30 mm - DIN Rail -
N° de stock RS 537-4491
Référence fabricantAC-1010
2,984 €
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Unité
- - - - - - 10A - -40°C +120°C 23.8 x 23.8 x 11.12 mm - PCB Mount -
N° de stock RS 106-8537
Référence fabricant56T100C
1,352 €
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Unité
- - - - - - 10A - -40°C +85°C 16.79 x 8.89 x 20.19 mm - Through Hole -
N° de stock RS 533-0621
Référence fabricantCTSCEN200<1000/5
MarqueHOBUT
83,16 €
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200:5, 400:5, 600:5, 800:5, 1000:5 - Clip Fit 125mm 132mm 38mm - - -30°C +80°C - - - -
N° de stock RS 668-4064
Référence fabricantCT105F200/5-2.5/1
MarqueHOBUT
42,43 €
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200:5 21mm Base Mounted 79mm 105mm 53mm - - -30°C +80°C - - - -
N° de stock RS 331-345
Référence fabricantCT132M80/5-1.5/1
MarqueHOBUT
14,43 €
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80:5 21mm DIN Rail Mounted 65mm 45mm 30mm - - -30°C +85°C - - - -