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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60:5 13mm Straight Through - - - 60A 5 A - - 105 x 71 x 90 mm - Panel Mount 7KT12
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2000:5 - Window 84.1mm 112mm 127.5mm 2kA 5 A -30°C +55°C 112 x 127.5 x 84.1 mm Sentron Power Monitoring Devices Chassis Mount Sentron
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60:1 17.5mm Window - - - 60A 1 A -10°C 55°C 74.5 x 48 x 80 mm Measuring Devices Panel Mount 4NC
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N° de stock RS 203-2054
Référence fabricant3RB2906-2DG1
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159,00 €
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- - Straight Through 83mm 45.3mm - 2.4 → 25A 25 A - - - - Stand Alone SIRIUS
N° de stock RS 175-6148
Référence fabricant4NC5122-2DE21
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73,89 €
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200:5 - Window 65.6mm 60mm 75.3mm 200A 5 A -30°C +55°C 60 x 75.3 x 65.6 mm Sentron Power Monitoring Devices Chassis Mount Sentron
N° de stock RS 175-6189
Référence fabricant4NC5327-2DE21
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74,88 €
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600:5 - Window 84.1mm 82.5mm 98mm 600A 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 123-9517
Référence fabricant4NC5222-0CE20
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81,31 €
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200:1 28mm Window - - - 200A 1 A -10°C 55°C 80 x 64 x 85.5 mm Measuring Devices Panel Mount 4NC
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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
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250:1 28mm Window - - - 250A 1 A -10°C 55°C 80 x 64 x 85.5 mm Measuring Devices Panel Mount 4NC
N° de stock RS 175-6173
Référence fabricant4NC5225-2DE21
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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 175-6184
Référence fabricant4NC5326-2CE21
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500:5 - Window 84.1mm 82.5mm 98mm 500A 5 A -30°C +55°C 82.5 x 98 x 84.1 mm Sentron Power Monitoring Devices Chassis Mount Sentron
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Référence fabricant4NC5940-5LT21
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- - - - - - - - - - - 4NC54 Current Transformers H-Rail Mount Sentron
N° de stock RS 175-6155
Référence fabricant4NC5124-2FE21
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70,56 €
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300:5 - Window 65.6mm 60mm 75.3mm 300A 5 A -30°C +55°C 60 x 75.3 x 65.6 mm Sentron Power Monitoring Devices Chassis Mount Sentron
N° de stock RS 175-6222
Référence fabricant4NC5923-5LT21
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3,56 €
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- - - - - - - - - - - 4NC51 Current Transformers H-Rail Mount Sentron
N° de stock RS 175-6196
Référence fabricant4NC5431-0DH21
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118,80 €
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800:1 - Window 84.1mm 112mm 127.5mm 800A 1 A -30°C +55°C 112 x 127.5 x 84.1 mm Sentron Power Monitoring Devices Chassis Mount Sentron
N° de stock RS 175-6129
Référence fabricant4NC5112-0CB21
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70,47 €
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50:1 - Window 65.6mm 60mm 75.3mm 50A 1 A -30°C +55°C 60 x 75.3 x 65.6 mm Sentron Power Monitoring Devices Chassis Mount Sentron
N° de stock RS 123-9523
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81,31 €
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400:1 28mm Window - - - 400A 1 A -10°C 55°C 80 x 64 x 85.5 mm Measuring Devices Panel Mount 4NC
N° de stock RS 123-9540
Référence fabricant7KT1202
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150:5 13mm Straight Through - - - 150A 5 A - - 105 x 71 x 90 mm - Panel Mount 7KT12
N° de stock RS 175-6149
Référence fabricant4NC5122-2FC21
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74,88 €
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200:5 - Window 65.6mm 60mm 75.3mm 200A 5 A -30°C +55°C 60 x 75.3 x 65.6 mm Sentron Power Monitoring Devices Chassis Mount Sentron