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. 173-0044
BrandRS PRO
MYR7.059
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
MYR8.02
Each
units
300:1 5mm - - - 15A - - -40°C - +120°C - 17.2 x 9.53 x 20.4 mm -
RS Stock No. 173-0217
BrandRS PRO
MYR29.591
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. 124-3881
BrandRS PRO
MYR15.43
Each
units
500:1 5mm - - - 15A - - -40°C - +120°C - 17.2 x 9.53 x 20.4 mm -
RS Stock No. 173-0041
BrandRS PRO
MYR6.577
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. 124-3893
BrandRS PRO
MYR32.55
Each
units
1000:1 14.6mm - - - 200A - - -55°C - +130°C - 38.1 x 15.9 x 38.1 mm -
RS Stock No. 173-0045
BrandRS PRO
MYR13.954
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. 124-3879
BrandRS PRO
MYR8.02
Each
units
50:1 5mm - - - 15A - - -40°C - +120°C - 17.2 x 9.53 x 20.4 mm -
RS Stock No. 171-8834
BrandRS PRO
MYR319.61
Each
units
1000:5 38 x 128mm Base Mounted - - 1000A 5 A 170mm -5°C 99mm +55°C 45mm 99 x 45 x 170 mm -
RS Stock No. 171-8762
BrandRS PRO
MYR68.68
Each
units
300:5 21 x 10mm Clip Fit - - 300A 5 A 65mm -5°C 45mm +55°C 40mm 45 x 40 x 65 mm -
RS Stock No. 173-0238
BrandRS PRO
MYR20.118
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 -
RS Stock No. 171-8801
BrandRS PRO
MYR151.26
Each
units
600:5 41 x 41mm Clip Fit - - 600A 5 A 98mm -5°C 74mm +55°C 45mm 74 x 45 x 98 mm -
RS Stock No. 171-8835
BrandRS PRO
MYR335.98
Each
units
1250:5 38 x 128mm Base Mounted - - 1250A 5 A 170mm -5°C 99mm +55°C 45mm 99 x 45 x 170 mm -
RS Stock No. 171-8797
BrandRS PRO
MYR103.00
Each
units
- - - - - - - - - - - - - -
RS Stock No. 171-8832
BrandRS PRO
MYR164.84
Each
units
400:5 45mm Base Mounted - - 400A 5 A 102.5mm - 141mm - 38mm 141 x 38 x 102.5 mm MCCB
RS Stock No. 171-8823
BrandRS PRO
MYR267.73
Each
units
3000:5 100 x 30mm Clip Fit - - 3000A 5 A 155mm -5°C 140mm +55°C 45mm 140 x 45 x 155 mm -
RS Stock No. 171-8811
BrandRS PRO
MYR172.50
Each
units
800:5 80 x 12mm Clip Fit - - 800A 5 A 126mm -5°C 104mm +55°C 45mm 104 x 45 x 126 mm -
RS Stock No. 124-3899
BrandRS PRO
MYR28.52
Each
units
750:1 5mm - - - 7.5A - - -40°C - +120°C - 17.2 x 9.53 x 20.4 mm -
RS Stock No. 173-0237
BrandRS PRO
MYR25.239
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. 171-8805
BrandRS PRO
MYR146.31
Each
units
1000:5 61 x 51mm Clip Fit - - 1000A 5 A 110mm -5°C 86mm +55°C 45mm 86 x 45 x 110 mm -