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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Description Price 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 Stock No. 122-0472
Mfr. Part No.192T3310
BrandSocomec
£50.37
Each
Units
- 18mm - - - - - - - - - - 115 x 65 x 37 mm -
RS Stock No. 175-6197
Mfr. Part No.4NC5431-2CH21
BrandSiemens
£72.98
Each
Units
800:5 - Window - - 800A 5 A 84.1mm -30°C 112mm +55°C 127.5mm 112 x 127.5 x 84.1 mm Sentron Power Monitoring Devices
RS Stock No. 200-3798
Mfr. Part No.HLSR 120-P/SP10
BrandLEM
£9.56
Each
Units
120:1 - - Open Loop +5 V 120A - - - - - - - -
RS Stock No. 175-6196
Mfr. Part No.4NC5431-0DH21
BrandSiemens
£79.80
Each
Units
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 Stock No. 187-9941
Mfr. Part No.192T0525
BrandSocomec
£33.44
Each
Units
25:5 - DIN Rail Mounted - - 25A 5 A 85.5mm - 71mm - 45mm 85.5 x 71 x 45 mm Energy Meters, Mutlfunction Meters
RS Stock No. 175-6195
Mfr. Part No.4NC5431-0CH21
BrandSiemens
£79.11
Each
Units
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 Stock No. 2509155395
Mfr. Part No.A8220250
£304.47
Each
Units
- - - - - - - - - - - - - -
RS Stock No. 2509299928
Mfr. Part No.ACST-261-1
£1.40
Each
Units
- - - - - - - - - - - - - -