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 715-7071
Référence fabricant56T200C
1,38 €
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- - - - - - 10A - -40°C +85°C 16.79 x 8.89 x 20.19 mm - Through Hole -
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200:5 - Window 67.6mm 60.6mm 78.4mm 200A 5 A -30°C +55°C 60.6 x 78.4 x 67.6 mm Sentron Power Monitoring Devices Chassis Mount Sentron
N° de stock RS 122-0464
Référence fabricant192T2110
MarqueSocomec
20,39 €
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- 17.5mm - - - - - - - - 65 x 49.5 x 50 mm - DIN Rail TCB 17-20
N° de stock RS 175-6170
Référence fabricant4NC5225-0CE21
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70,47 €
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400:1 - Window 67.6mm 60.6mm 78.4mm 400A 1 A -30°C +55°C 60.6 x 78.4 x 67.6 mm Sentron Power Monitoring Devices Chassis Mount Sentron
N° de stock RS 175-6171
Référence fabricant4NC5225-0DE21
MarqueSiemens
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400:1 - Window 67.6mm 60.6mm 78.4mm 400A 1 A -30°C +55°C 60.6 x 78.4 x 67.6 mm Sentron Power Monitoring Devices Chassis Mount Sentron
N° de stock RS 175-6162
Référence fabricant4NC5223-0CE21
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250:1 - Window 67.6mm 60.6mm 78.4mm 250A 1 A -30°C +55°C 60.6 x 78.4 x 67.6 mm Sentron Power Monitoring Devices Chassis Mount Sentron
N° de stock RS 668-4067
Référence fabricantCT105F250/5-2.5/1
MarqueHOBUT
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250:5 21mm Base Mounted 79mm 105mm 53mm - - -30°C +80°C - - - -
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- 26mm - - - - - - - - 75.5 x 61 x 48 mm - DIN Rail TCB 26-30
N° de stock RS 175-6172
Référence fabricant4NC5225-2CE21
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400:5 - Window 67.6mm 60.6mm 78.4mm 400A 5 A -30°C +55°C 60.6 x 78.4 x 67.6 mm Sentron Power Monitoring Devices Chassis Mount Sentron
N° de stock RS 175-6180
Référence fabricant4NC5325-2CE21
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74,79 €
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400:5 - Window 84.1mm 82.5mm 98mm 400A 5 A -30°C +55°C 82.5 x 98 x 84.1 mm Sentron Power Monitoring Devices Chassis Mount Sentron
N° de stock RS 175-6163
Référence fabricant4NC5223-0DE21
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250:1 - Window 67.6mm 60.6mm 78.4mm 250A 1 A -30°C +55°C 60.6 x 78.4 x 67.6 mm Sentron Power Monitoring Devices Chassis Mount Sentron
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Référence fabricantB82801C0565A100
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- - - - - - 40A - -40°C +125°C 14.22 x 13.46 x 10 mm - Surface Mount -
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Référence fabricant192T9696
MarqueSocomec
95,04 €
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- 85mm - - - - - - - - 184.8 x 172 x 52 mm - DIN Rail TCB 85-100
N° de stock RS 122-0467
Référence fabricant192T2325
MarqueSocomec
24,37 €
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- 26mm - - - - - - - - 75.5 x 61 x 48 mm - DIN Rail TCB 26-30
N° de stock RS 124-3898
MarqueRS PRO
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- - - - - - 5A - -40°C +120°C 17.2 x 9.53 x 20.4 mm - PCB Mount -
N° de stock RS 175-6181
Référence fabricant4NC5325-2DE21
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400:5 - Window 84.1mm 82.5mm 98mm 400A 5 A -30°C +55°C 82.5 x 98 x 84.1 mm Sentron Power Monitoring Devices Chassis Mount Sentron
N° de stock RS 175-6164
Référence fabricant4NC5223-2CE21
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250:5 - Window 67.6mm 60.6mm 78.4mm 250A 5 A -30°C +55°C 60.6 x 78.4 x 67.6 mm Sentron Power Monitoring Devices Chassis Mount Sentron
N° de stock RS 886-2196
Référence fabricantXM19-415151S000000
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1250:5 50mm Base Mounted - - - - - - - 86 x 45 x 110 mm - Surface Mount Omega XMER
N° de stock RS 897-6924
Référence fabricant4 121 57
MarqueLegrand
197,91 €
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250:5 - Base Mounted - - - - - -25°C +50°C 107 x 58.5 x 56 mm Ammeter, Electricity Meter, Measurement Control Unit Surface Mount -