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. 510-9152
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€ 140,00
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RS-stocknr. 175-6194
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RS-stocknr. 175-6204
Fabrikantnummer4NC5433-2DH21
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€ 120,00
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1200:5 - Window 84.1mm 112mm 127.5mm 1.2kA 5 A -30°C +55°C 112 x 127.5 x 84.1 mm Sentron Power Monitoring Devices Chassis Mount Sentron
RS-stocknr. 175-6196
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€ 129,00
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RS-stocknr. 175-6205
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RS-stocknr. 175-6124
Fabrikantnummer3UL2304-1A
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€ 180,00
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- - Toroidal Ring 64mm 124.5mm 130mm 30 mA → 40 A 225 A -25°C +60°C 124.5 x 130 x 64 mm Fault Current Monitoring Chassis Mount -
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Fabrikantnummer4NC5231-2FE21
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€ 80,90
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800:5 - Window 62.2mm 59.5mm 75.3mm 800A 5 A -30°C +55°C 59.5 x 75.3 x 62.2 mm Sentron Power Monitoring Devices Chassis Mount Sentron
RS-stocknr. 175-6197
Fabrikantnummer4NC5431-2CH21
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€ 118,00
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800:5 - Window 84.1mm 112mm 127.5mm 800A 5 A -30°C +55°C 112 x 127.5 x 84.1 mm Sentron Power Monitoring Devices Chassis Mount Sentron
RS-stocknr. 175-6137
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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
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Fabrikantnummer3UL2302-1A
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€ 157,00
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- - Toroidal Ring 64mm 70mm 75.5mm 30 mA → 40 A 85 A -25°C +60°C 70 x 75.5 x 64 mm Fault Current Monitoring Chassis Mount, DIN Rail -
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Fabrikantnummer4NC5438-2CJ21
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€ 127,00
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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. 175-6151
Fabrikantnummer4NC5123-0DE21
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€ 80,90
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250:1 - Window 65.6mm 60mm 75.3mm 250A 1 A -30°C +55°C 60 x 75.3 x 65.6 mm Sentron Power Monitoring Devices Chassis Mount Sentron
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€ 122,00
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1000:5 64mm Window 84.1mm 112mm 127.5mm 1kA 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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