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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Omschrijving Prijs 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-stocknr. 123-9539
Fabrikantnummer7KT1200
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83,40 €
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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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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
RS-stocknr. 175-6225
Fabrikantnummer4NC5940-5LT21
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5,00 €
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- - - - - - - - - - - 4NC54 Current Transformers H-Rail Mount Sentron
RS-stocknr. 123-9536
Fabrikantnummer4NC5433-2CH20
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112,00 €
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1250:5 45mm Window - - - 1.25kA 5 A -10°C 55°C 112 x 80 x 117.5 mm Measuring Devices Panel Mount 4NC
RS-stocknr. 175-6216
Fabrikantnummer4NC5440-0CJ21
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156,00 €
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2500:1 - Window 84.1mm 112mm 127.5mm 2.5kA 1 A -30°C +55°C 112 x 127.5 x 84.1 mm Sentron Power Monitoring Devices Chassis Mount Sentron
RS-stocknr. 175-6145
Fabrikantnummer4NC5122-0CE21
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69,20 €
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200:1 20mm Window 65.6mm 60mm 75.3mm 200A 1 A -30°C +55°C 60 x 75.3 x 65.6 mm Sentron Power Monitoring Devices Chassis Mount Sentron
RS-stocknr. 175-6196
Fabrikantnummer4NC5431-0DH21
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117,00 €
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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
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Fabrikantnummer4NC5225-0DE21
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74,50 €
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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
RS-stocknr. 175-6143
Fabrikantnummer4NC5121-2DC21
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72,50 €
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150:1 - Window 65.6mm 60mm 75.3mm 150A 1 A -30°C +55°C 60 x 75.3 x 65.6 mm Sentron Power Monitoring Devices Chassis Mount Sentron
RS-stocknr. 175-6125
Fabrikantnummer3UL2305-1A
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240,00 €
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- - Toroidal Ring 64mm 163mm 169mm 30 mA → 40 A 400 A -25°C +60°C 163 x 169 x 64 mm Fault Current Monitoring Chassis Mount -
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139,00 €
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2500:5 - Window 84.1mm 112mm 127.5mm 2.5kA 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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Fabrikantnummer4NC5126-2FE21
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69,30 €
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500:5 - Window 65.6mm 60mm 75.3mm 500A 5 A -30°C +55°C 60 x 75.3 x 65.6 mm Sentron Power Monitoring Devices Chassis Mount Sentron
RS-stocknr. 175-6199
Fabrikantnummer4NC5432-0CH21
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123,00 €
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1000:1 - Window 84.1mm 112mm 127.5mm 1kA 1 A -30°C +55°C 112 x 127.5 x 84.1 mm Sentron Power Monitoring Devices Chassis Mount Sentron
RS-stocknr. 175-6223
Fabrikantnummer4NC5925-5LT21
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4,40 €
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- - - - - - - - - - - 4NC52 Current Transformers H-Rail Mount Sentron
RS-stocknr. 175-6169
Fabrikantnummer4NC5224-2DE21
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72,50 €
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300:5 - Window 67.6mm 60.6mm 78.4mm 300A 5 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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600:1 - Window 84.1mm 82.5mm 98mm 600A 1 A -30°C +55°C 82.5 x 98 x 84.1 mm Sentron Power Monitoring Devices Chassis Mount Sentron
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1500:1 45mm Window - - - 1.5kA 1 A -10°C 55°C 112 x 80 x 117.5 mm Measuring Devices Panel Mount 4NC
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