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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Omschrijving Prijs 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-stocknr. 123-9539
Fabrikantnummer7KT1200
FabrikantSiemens
146,70 €
Each
Aantal stuks
60:5 13mm Straight Through - - 60A 5 A - - - - - 105 x 71 x 90 mm -
Nieuw
RS-stocknr. 216-4358
Fabrikantnummer3RB2966-2WH2
FabrikantSiemens
447,00 €
Each
Aantal stuks
63 - 630 - Straight Through - - - - 147mm - 145mm - - - -
RS-stocknr. 175-6194
Fabrikantnummer4NC5331-2DE21
FabrikantSiemens
74,88 €
Each
Aantal stuks
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-stocknr. 175-6126
Fabrikantnummer3UL2306-1A
FabrikantSiemens
306,90 €
Each
Aantal stuks
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-stocknr. 175-6195
Fabrikantnummer4NC5431-0CH21
FabrikantSiemens
117,90 €
Each
Aantal stuks
800:1 - Window - - 800A 1 A 84.1mm -30°C 112mm +55°C 127.5mm 112 x 127.5 x 84.1 mm Sentron Power Monitoring Devices
RS-stocknr. 175-6213
Fabrikantnummer4NC5438-0CJ21
FabrikantSiemens
144,90 €
Each
Aantal stuks
2000:1 - Window - - 2000A 1 A 84.1mm -30°C 112mm +55°C 127.5mm 112 x 127.5 x 84.1 mm Sentron Power Monitoring Devices
RS-stocknr. 175-6150
Fabrikantnummer4NC5123-0CE21
FabrikantSiemens
70,47 €
Each
Aantal stuks
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-stocknr. 175-6188
Fabrikantnummer4NC5327-2CE21
FabrikantSiemens
74,79 €
Each
Aantal stuks
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-stocknr. 175-6134
Fabrikantnummer4NC5115-2CC21
FabrikantSiemens
63,90 €
Each
Aantal stuks
75:5 - Window - - 75A 5 A 65.6mm -30°C 60mm +55°C 75.3mm 60 x 75.3 x 65.6 mm Sentron Power Monitoring Devices
Nieuw
RS-stocknr. 213-1328
Fabrikantnummer5SV8701-0KK
FabrikantSiemens
147,00 €
Each
Aantal stuks
- - - - - 63A 30 mA 32mm - 59mm - - - -
RS-stocknr. 175-6156
Fabrikantnummer4NC5125-2FE21
FabrikantSiemens
70,56 €
Each
Aantal stuks
300:5 - Window - - 300A 5 A 65.6mm -30°C 60mm +55°C 75.3mm 60 x 75.3 x 65.6 mm Sentron Power Monitoring Devices
RS-stocknr. 175-6216
Fabrikantnummer4NC5440-0CJ21
FabrikantSiemens
159,30 €
Each
Aantal stuks
2500:1 - Window - - 2500A 1 A 84.1mm -30°C 112mm +55°C 127.5mm 112 x 127.5 x 84.1 mm Sentron Power Monitoring Devices
RS-stocknr. 175-6127
Fabrikantnummer3UL2307-1A
FabrikantSiemens
445,50 €
Each
Aantal stuks
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-stocknr. 175-6151
Fabrikantnummer4NC5123-0DE21
FabrikantSiemens
74,88 €
Each
Aantal stuks
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-stocknr. 175-6193
Fabrikantnummer4NC5330-2DE21
FabrikantSiemens
74,88 €
Each
Aantal stuks
750:5 - Window - - 750A 5 A 84.1mm -30°C 82.5mm +55°C 98mm 82.5 x 98 x 84.1 mm Sentron Power Monitoring Devices
RS-stocknr. 175-6125
Fabrikantnummer3UL2305-1A
FabrikantSiemens
222,30 €
Each
Aantal stuks
40:1 - Toroidal Ring - - 40A 400 A 64mm -25°C 163mm +60°C 169mm 163 x 169 x 64 mm Fault Current Monitoring
RS-stocknr. 175-6203
Fabrikantnummer4NC5433-0DH21
FabrikantSiemens
145,80 €
Each
Aantal stuks
1200:1 - Window - - 1200A 1 A 84.1mm -30°C 112mm +55°C 127.5mm 112 x 127.5 x 84.1 mm Sentron Power Monitoring Devices
RS-stocknr. 175-6146
Fabrikantnummer4NC5122-0DE21
FabrikantSiemens
74,88 €
Each
Aantal stuks
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-stocknr. 123-9515
Fabrikantnummer4NC5123-0CE20
FabrikantSiemens
81,31 €
Each
Aantal stuks
250:1 17.5mm Window - - 250A 1 A - -10°C - 55°C - 74.5 x 48 x 80 mm Measuring Devices
RS-stocknr. 175-6157
Fabrikantnummer4NC5126-2FE21
FabrikantSiemens
70,56 €
Each
Aantal stuks
500:5 - Window - - 500A 5 A 65.6mm -30°C 60mm +55°C 75.3mm 60 x 75.3 x 65.6 mm Sentron Power Monitoring Devices