Current Transformers

Current transformers or (CT’s) are instruments that are used to transform the current from a high current into a lower current so that the power can then be used for measuring and controlling. The transformers consist of a core, a primary and a secondary winding.RS Components offer an extensive range of highly accurate CT’s in various transformer types, current ratings, CT ratio supply voltages and mounting types to suit every application. Supplied by industry-leading brands including Siemens, Murata Power Solutions LEM and of course RS PRO.

How does a current transformer work?

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.

Types of current transformer

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.

Where would I use a current transformer?

CT's are used in a wide range of industrial and commercial measurement applications. Some of the most common are:Generating stationsElectrical substationsCommercial electric power distributionElectrical panels


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Beskrivning Pris Current Ratio Bore Size Transformer Type Sensor Technology Supply Voltage Input Current Output Current Overall Height Minimum Temperature Overall Width Maximum Temperature Overall Depth Dimensions For Use With
RS-artikelnummer 123-9540
Tillv. art.nr7KT1202
VarumärkeSiemens
885,11 kr
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150:5 13mm Straight Through - - 150A 5 A - - - - - 105 x 71 x 90 mm -
RS-artikelnummer 510-9152
Tillv. art.nr7KT1201
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900,04 kr
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- 13mm Straight Through - - - - - - - - - - -
RS-artikelnummer 175-6173
Tillv. art.nr4NC5225-2DE21
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726,61 kr
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400:5 - Window - - 400A 5 A 67.6mm -30°C 60.6mm +55°C 78.4mm 60.6 x 78.4 x 67.6 mm Sentron Power Monitoring Devices
RS-artikelnummer 175-6151
Tillv. art.nr4NC5123-0DE21
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827,53 kr
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250:1 - Window - - 250A 1 A 65.6mm -30°C 60mm +55°C 75.3mm 60 x 75.3 x 65.6 mm Sentron Power Monitoring Devices
RS-artikelnummer 175-6187
Tillv. art.nr4NC5327-0DE21
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1 025,88 kr
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600:1 - Window - - 600A 1 A 84.1mm -30°C 82.5mm +55°C 98mm 82.5 x 98 x 84.1 mm Sentron Power Monitoring Devices
Nytt
RS-artikelnummer 213-1330
Tillv. art.nr5SV8704-0KK
VarumärkeSiemens
3 152,33 kr
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- - - - - 250A 100 mA 33mm - 170mm - - - -
RS-artikelnummer 175-6174
Tillv. art.nr4NC5227-2FE21
VarumärkeSiemens
736,64 kr
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600:5 - Window - - 600A 5 A 62.2mm -30°C 59.5mm +55°C 75.3mm 59.5 x 75.3 x 62.2 mm Sentron Power Monitoring Devices
RS-artikelnummer 175-6183
Tillv. art.nr4NC5326-0DE21
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1 025,88 kr
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500:1 - Window - - 500A 1 A 84.1mm -30°C 82.5mm +55°C 98mm 82.5 x 98 x 84.1 mm Sentron Power Monitoring Devices
RS-artikelnummer 175-6137
Tillv. art.nr4NC5117-0DA21
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827,53 kr
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200:1 20mm Window - - 200A 1 A 65.6mm -30°C 60mm +55°C 75.3mm 60 x 75.3 x 65.6 mm Sentron Power Monitoring Devices
RS-artikelnummer 175-6125
Tillv. art.nr3UL2305-1A
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2 708,66 kr
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40:1 - Toroidal Ring - - 40A 400 A 64mm -25°C 163mm +60°C 169mm 163 x 169 x 64 mm Fault Current Monitoring
RS-artikelnummer 175-6188
Tillv. art.nr4NC5327-2CE21
VarumärkeSiemens
735,63 kr
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600:5 - Window - - 600A 5 A 84.1mm -30°C 82.5mm +55°C 98mm 82.5 x 98 x 84.1 mm Sentron Power Monitoring Devices
RS-artikelnummer 175-6206
Tillv. art.nr4NC5434-2CH21
VarumärkeSiemens
1 247,69 kr
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1250:5 - Window - - 1250A 5 A 84.1mm -30°C 112mm +55°C 127.5mm 112 x 127.5 x 84.1 mm Sentron Power Monitoring Devices
RS-artikelnummer 175-6152
Tillv. art.nr4NC5123-2CE21
VarumärkeSiemens
705,96 kr
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250:5 - Window - - 250A 5 A 65.6mm -30°C 60mm +55°C 75.3mm 60 x 75.3 x 65.6 mm Sentron Power Monitoring Devices
RS-artikelnummer 175-6138
Tillv. art.nr4NC5117-2CC21
VarumärkeSiemens
705,96 kr
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100:5 - Window - - 100A 5 A 65.6mm -30°C 60mm +55°C 75.3mm 60 x 75.3 x 65.6 mm Sentron Power Monitoring Devices
RS-artikelnummer 175-6127
Tillv. art.nr3UL2307-1A
VarumärkeSiemens
5 417,31 kr
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40:1 - Toroidal Ring - - 40A 630 A 62mm -25°C 300mm +60°C 286.2mm 300 x 286.2 x 62 mm Fault Current Monitoring
RS-artikelnummer 175-6126
Tillv. art.nr3UL2306-1A
VarumärkeSiemens
3 732,40 kr
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40:1 - Toroidal Ring - - 40A 500 A 64mm -25°C 201mm +60°C 207.5mm 201 x 207.5 x 64 mm Fault Current Monitoring
RS-artikelnummer 175-6142
Tillv. art.nr4NC5121-2CC21
VarumärkeSiemens
705,96 kr
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150:5 - Window - - 150A 5 A 65.6mm -30°C 60mm +55°C 75.3mm 60 x 75.3 x 65.6 mm Sentron Power Monitoring Devices
RS-artikelnummer 175-6202
Tillv. art.nr4NC5432-2DH21
VarumärkeSiemens
1 158,08 kr
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1000:5 64mm Window - - 1000A 5 A 84.1mm -30°C 112mm +55°C 127.5mm 112 x 127.5 x 84.1 mm Sentron Power Monitoring Devices
RS-artikelnummer 175-6194
Tillv. art.nr4NC5331-2DE21
VarumärkeSiemens
827,53 kr
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800:5 - Window - - 800A 5 A 84.1mm -30°C 82.5mm +55°C 98mm 82.5 x 98 x 84.1 mm Sentron Power Monitoring Devices
RS-artikelnummer 175-6143
Tillv. art.nr4NC5121-2DC21
VarumärkeSiemens
726,61 kr
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150:1 - Window - - 150A 1 A 65.6mm -30°C 60mm +55°C 75.3mm 60 x 75.3 x 65.6 mm Sentron Power Monitoring Devices