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. 173-0219
BrandRS PRO
£2.743
Each (In a Box of 18)
Units
1000:1 23.8mm - - - 500A - - -55°C - +130°C - 55.6 x 20.6 x 55.6 mm -
RS Stock No. 124-3881
BrandRS PRO
£2.12
Each
Units
500:1 5mm - - - 15A - - -40°C - +120°C - 17.2 x 9.53 x 20.4 mm -
RS Stock No. 173-0045
BrandRS PRO
£1.918
Each (In a Box of 351)
Units
500:1 5mm - - - 15A - - -40°C - +120°C - 17.2 x 9.53 x 20.4 mm -
RS Stock No. 173-0216
BrandRS PRO
£2.729
Each (In a Box of 351)
Units
750:1 5mm - - - 7.5A - - -40°C - +120°C - 17.2 x 9.53 x 20.4 mm -
RS Stock No. 173-0236
BrandRS PRO
£1.475
Each (In a Box of 351)
Units
1500:1 5mm - - - 15A - - -40°C - +120°C - 17.2 x 9.53 x 20.4 mm -
RS Stock No. 124-3901
BrandRS PRO
£1.41
Each
Units
1500:1 5mm - - - 15A - - -40°C - +120°C - 17.2 x 9.53 x 20.4 mm -
RS Stock No. 124-3899
BrandRS PRO
£3.00
Each
Units
750:1 5mm - - - 7.5A - - -40°C - +120°C - 17.2 x 9.53 x 20.4 mm -
RS Stock No. 173-0184
BrandRS PRO
£4.442
Each (In a Box of 98)
Units
50:1 8mm - - - 50A - - -40°C - +120°C - 32 x 20.5 x 35 mm -
RS Stock No. 173-0197
BrandRS PRO
£1.218
Each (In a Box of 176)
Units
75:1 - - - - 75A - - -55°C - +130°C - 30.2 x 14.3 x 30.2 mm -
RS Stock No. 124-3883
BrandRS PRO
£4.91
Each
Units
50:1 8mm - - - 50A - - -40°C - +120°C - 32 x 20.5 x 35 mm -
RS Stock No. 124-3888
BrandRS PRO
£1.24
Each
Units
1000:1 11.4mm - - - 75A - - -55°C - +130°C - 30.2 x 14.3 x 30.2 mm -
RS Stock No. 173-0235
BrandRS PRO
£3.144
Each (In a Box of 351)
Units
1000:1 5mm - - - 10A - - -40°C - +120°C - 17.2 x 9.53 x 20.4 mm -
RS Stock No. 124-3900
BrandRS PRO
£3.48
Each
Units
1000:1 5mm - - - 10A - - -40°C - +120°C - 17.2 x 9.53 x 20.4 mm -
RS Stock No. 173-0199
BrandRS PRO
£2.371
Each (In a Box of 133)
Units
1000:1 14.6mm - - - 125A - - -55°C - +130°C - 34.9 x 14.3 x 34.9 mm -
RS Stock No. 124-3890
BrandRS PRO
£2.64
Each
Units
1000:1 14.6mm - - - 125A - - -55°C - +130°C - 34.9 x 14.3 x 34.9 mm -
RS Stock No. 173-0237
BrandRS PRO
£1.229
Each (In a Box of 351)
Units
1000:1 5mm - - - 120A - - -40°C - +85°C - 17.2 x 9.53 x 20.4 mm -
RS Stock No. 124-3903
BrandRS PRO
£1.25
Each
Units
1000:1 5mm - - - 120A - - -40°C - +85°C - 17.2 x 9.53 x 20.4 mm -
RS Stock No. 173-0200
BrandRS PRO
£1.645
Each (In a Box of 133)
Units
1000:1 14.6mm - - - 125A - - -55°C - +130°C - 34.9 x 14.3 x 34.9 mm -
RS Stock No. 124-3902
BrandRS PRO
£2.80
Each
Units
2500:1 9.5mm - - - 50A - - -40°C - +85°C - 23.8 x 11.12 x 23.8 mm -
RS Stock No. 173-0238
BrandRS PRO
£2.765
Each (In a Box of 220)
Units
2500:1 9.5mm - - - 50A - - -40°C - +85°C - 23.8 x 11.12 x 23.8 mm -