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. 173-0201
BrandRS PRO
£2.379
Each (In a Box of 114)
Units
1000:1 14.6mm - - - 200A - - -55°C - +130°C - 38.1 x 15.9 x 38.1 mm -
RS Stock No. 124-3892
BrandRS PRO
£4.39
Each
Units
1000:1 14.6mm - - - 200A - - -55°C - +130°C - 38.1 x 15.9 x 38.1 mm -
RS Stock No. 173-0220
BrandRS PRO
£2.778
Each (In a Box of 140)
Units
500:1 7mm - - - 25A - - -40°C - +85°C - 19 x 11.5 x 21.5 mm -
RS Stock No. 124-3896
BrandRS PRO
£3.09
Each
Units
500:1 7mm - - - 25A - - -40°C - +85°C - 19 x 11.5 x 21.5 mm -
RS Stock No. 124-3889
BrandRS PRO
£3.67
Each
Units
1000:1 11.4mm - - - 75A - - -55°C - +130°C - 30.2 x 14.3 x 30.2 mm -
RS Stock No. 173-0198
BrandRS PRO
£3.339
Each (In a Box of 176)
Units
1000:1 11.4mm - - - 75A - - -55°C - +130°C - 30.2 x 14.3 x 30.2 mm -
RS Stock No. 173-0218
BrandRS PRO
£3.38
Each (In a Box of 25)
Units
1000:1 19.5mm - - - 250A - - -55°C - +130°C - 44.5 x 14.3 x 44.5 mm -
RS Stock No. 124-3894
BrandRS PRO
£3.50
Each
Units
1000:1 19.5mm - - - 250A - - -55°C - +130°C - 44.5 x 14.3 x 44.5 mm -
RS Stock No. 173-0044
BrandRS PRO
£0.97
Each (In a Box of 351)
Units
300:1 5mm - - - 15A - - -40°C - +120°C - 17.2 x 9.53 x 20.4 mm -
RS Stock No. 124-3880
BrandRS PRO
£1.10
Each
Units
300:1 5mm - - - 15A - - -40°C - +120°C - 17.2 x 9.53 x 20.4 mm -
RS Stock No. 124-3898
BrandRS PRO
£1.80
Each
Units
500:1 5mm - - - 5A - - -40°C - +120°C - 17.2 x 9.53 x 20.4 mm -
RS Stock No. 173-0215
BrandRS PRO
£1.617
Each (In a Box of 351)
Units
500:1 5mm - - - 5A - - -40°C - +120°C - 17.2 x 9.53 x 20.4 mm -
RS Stock No. 173-0041
BrandRS PRO
£0.904
Each (In a Box of 351)
Units
50:1 5mm - - - 15A - - -40°C - +120°C - 17.2 x 9.53 x 20.4 mm -
RS Stock No. 124-3897
BrandRS PRO
£3.30
Each
Units
1000:1 7mm - - - 50A - - -40°C - +85°C - 19 x 11.5 x 21.5 mm -
RS Stock No. 124-3882
BrandRS PRO
£3.24
Each
Units
10:1 5mm - - - 10A - - -40°C - +120°C - 17.2 x 9.53 x 20.4 mm -
RS Stock No. 173-0181
BrandRS PRO
£2.66
Each (In a Box of 351)
Units
10:1 5mm - - - 10A - - -40°C - +120°C - 17.2 x 9.53 x 20.4 mm -
RS Stock No. 124-3879
BrandRS PRO
£1.10
Each
Units
50:1 5mm - - - 15A - - -40°C - +120°C - 17.2 x 9.53 x 20.4 mm -
RS Stock No. 173-0217
BrandRS PRO
£4.276
Each (In a Box of 114)
Units
1000:1 14.6mm - - - 200A - - -55°C - +130°C - 38.1 x 15.9 x 38.1 mm -
RS Stock No. 124-3893
BrandRS PRO
£4.70
Each
Units
1000:1 14.6mm - - - 200A - - -55°C - +130°C - 38.1 x 15.9 x 38.1 mm -
RS Stock No. 124-3895
BrandRS PRO
£8.99
Each
Units
1000:1 23.8mm - - - 500A - - -55°C - +130°C - 55.6 x 20.6 x 55.6 mm -