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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Description Prix 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
N° de stock RS 331-345
Référence fabricantCT132M80/5-1.5/1
MarqueHOBUT
14,43 €
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Unité
80:5 21mm DIN Rail Mounted 65mm 45mm 30mm - - -30°C +85°C - - - -
N° de stock RS 751-1614
Référence fabricant93481 P1
18,58 €
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Unité
- - - - - - 60A - -20°C +70°C 70 (Dia.) x 36 mm - Stand Alone -
N° de stock RS 173-0057
Référence fabricantAX-1000
2,636 €
Each (In a Box of 250)
Unité
- - - - - - 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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Unité
- - - - - - 10A - -40°C +85°C 16.79 x 8.89 x 20.19 mm - Through Hole -
N° de stock RS 399-7317
Référence fabricantAS-103
1,72 €
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Unité
- - - - - - 15A - -40°C +120°C 17.2 x 20.4 x 9.53 mm - PCB Mount -
N° de stock RS 106-8537
Référence fabricant56T100C
1,352 €
Each (In a Tube of 25)
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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Unité
200:5, 400:5, 600:5, 800:5, 1000:5 - Clip Fit 125mm 132mm 38mm - - -30°C +80°C - - - -
N° de stock RS 173-0161
Référence fabricantAP-2500
3,434 €
Each (In a Box of 250)
Unité
- - - - - - 15A - -40°C +85°C 17.2 x 9.53 x 20.4 mm - - -
N° de stock RS 123-6732
Référence fabricantXS01-275071S 000000
41,92 €
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Unité
250:5 - Base Mounted - - - 250A 5 A +20°C +70°C - - Plug In Omega
N° de stock RS 832-9848
Référence fabricantL01-8506
MarqueAlttec
20,62 €
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Unité
100:5 28mm Clip Fit 78.5mm 61mm 40mm - - - +40°C 78.5 x 61 x 72 mm - - -
N° de stock RS 871-1626
Référence fabricantB82801B0803A020
MarqueEPCOS
2,263 €
Each (In a Bag of 3)
Unité
- - - - - - 20A - -40°C +125°C 8.13 x 7.11 x 5.08 mm - Surface Mount -
N° de stock RS 871-1648
Référence fabricantB82801C2245A200
MarqueEPCOS
3,667 €
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Unité
- - - - - - 40A - -40°C +125°C 14.22 x 13.46 x 10 mm - Surface Mount -
N° de stock RS 775-2701
Référence fabricantCTSCMICRO19-100/5-T-S
MarqueHOBUT
50,06 €
Each
Unité
- - - 78mm 58mm 49mm - - -30°C 55°C - - - -
N° de stock RS 331-575
Référence fabricantCTSCM40500/5-5/1
MarqueHOBUT
49,22 €
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Unité
500:5 - Clip Fit 116mm 104.5mm 35.5mm - - -30°C +80°C - - - -
N° de stock RS 611-8602
Référence fabricantK8ACCT200L
MarqueOmron
68,30 €
1 Box of 1
Boîte(s)
- 30mm Toroidal Ring 81.5mm 76mm 20mm - - - - - - - -
N° de stock RS 715-7071
Référence fabricant56T200C
1,38 €
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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 162-0292
Référence fabricantB82801B0803A020
MarqueEPCOS
1,10 €
Each (On a Reel of 900)
Unité
- - - - - - 20A - -40°C +125°C 8.13 x 7.11 x 5.08 mm - Surface Mount -
N° de stock RS 914-5294
Référence fabricantCTSCMWH60/0.333V
MarqueHOBUT
21,71 €
Each
Unité
- 10mm Split Core - - - 60A 333 mV -15°C +50°C 28.7 x 26.4 x 41.7 mm Multi Function Meter Cable -
N° de stock RS 881-7935
Référence fabricantCTPROXT300
MarqueABB
31,95 €
Each
Unité
- 18mm - - - - - - -5°C +50°C 45 x 96 x 69 mm - BusBar, DIN Rail CT PRO XT
N° de stock RS 167-0564
Référence fabricantB82801C2245A200
MarqueEPCOS
1,994 €
Each (On a Reel of 200)
Unité
- - - - - - 40A - -40°C +125°C 14.22 x 13.46 x 10 mm - Surface Mount -