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


...
Read more Read less

Filters

Viewing 1 - 20 of 1099 products
Results per page
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
MYR6.345
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
MYR7.21
Each
units
300:1 5mm - - - 15A - - -40°C - +120°C - 17.2 x 9.53 x 20.4 mm -
RS Stock No. 124-3893
BrandRS PRO
MYR26.29
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
MYR10.722
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. 173-0041
BrandRS PRO
MYR5.912
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. 124-3879
BrandRS PRO
MYR6.30
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
MYR23.905
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
MYR11.85
Each
units
500:1 5mm - - - 15A - - -40°C - +120°C - 17.2 x 9.53 x 20.4 mm -
RS Stock No. 171-8821
BrandRS PRO
MYR191.57
Each
units
2000:5 100 x 30mm Clip Fit - - 2000A 5 A 155mm -5°C 140mm +55°C 45mm 140 x 45 x 155 mm -
RS Stock No. 171-8749
BrandRS PRO
MYR75.04
Each
units
50:1 21 x 10mm - - - - - 65mm - 45mm - 40mm 45 x 40 x 65 mm -
RS Stock No. 171-8852
BrandRS PRO
MYR243.99
Each
units
500:5 55 x 43mm Base Mounted - - 500A 5 A 125mm +20°C 108mm +70°C 51mm 108 x 51 x 125 mm -
RS Stock No. 171-8781
BrandRS PRO
MYR80.26
Each
units
100:5 30 x 11mm Clip Fit - - 100A 5 A 78mm -5°C 62mm +55°C 40mm 62 x 40 x 78 mm -
RS Stock No. 171-8798
BrandRS PRO
MYR71.09
Each
units
800:5 40 x 11mm Clip Fit - - 800A 5 A 78mm -5°C 62mm +55°C 40mm 62 x 40 x 78 mm -
RS Stock No. 171-8765
BrandRS PRO
MYR45.03
Each
units
100:5 30 x 10mm Clip Fit - - 100A 5 A 70mm -5°C 50mm +55°C 31mm 50 x 31 x 70 mm -
RS Stock No. 171-8805
BrandRS PRO
MYR129.80
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 -
RS Stock No. 173-0184
BrandRS PRO
MYR29.051
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. 171-8778
BrandRS PRO
MYR57.38
Each
units
500:5 30 x 10mm Clip Fit - - 500A 5 A 70mm -5°C 50mm +55°C 31mm 50 x 31 x 70 mm -
RS Stock No. 171-8772
BrandRS PRO
MYR71.14
Each
units
250:1 30 x 10mm - - - - - 70mm - 50mm - 30mm 50 x 30 x 70 mm -
RS Stock No. 171-8750
BrandRS PRO
MYR65.47
Each
units
50:5 21 x 10mm Clip Fit - - 50A 5 A 65mm -5°C 45mm +55°C 40mm 45 x 40 x 65 mm -
RS Stock No. 171-8822
BrandRS PRO
MYR194.29
Each
units
2500:5 100 x 30mm Clip Fit - - 2500A 5 A 155mm -5°C 140mm +55°C 45mm 140 x 45 x 155 mm -