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. 167-0136
Mfr. Part No.B82801B0305A125
BrandEPCOS
MYR5.92
Each (On a Reel of 900)
units
20:1 - - - - 20A - - -40°C - +125°C - 8.13 x 7.11 x 5.08 mm -
RS Stock No. 871-1616
Mfr. Part No.B82801B0305A125
BrandEPCOS
MYR9.483
Each (In a Bag of 3)
units
20:1 - - - - 20A - - -40°C - +125°C - 8.13 x 7.11 x 5.08 mm -
RS Stock No. 167-0562
Mfr. Part No.B82801C0145A050
BrandEPCOS
MYR7.814
Each (On a Reel of 200)
units
40:1 - - - - 40A - - -40°C - +125°C - 14.22 x 13.46 x 10 mm -
RS Stock No. 167-0135
Mfr. Part No.B82801B0205A100
BrandEPCOS
MYR5.598
Each (On a Reel of 900)
units
20:1 - - - - 20A - - -40°C - +125°C - 8.13 x 7.11 x 5.08 mm -
RS Stock No. 871-1632
Mfr. Part No.B82801C0145A050
BrandEPCOS
MYR15.607
Each (In a Bag of 3)
units
40:1 - - - - 40A - - -40°C - +125°C - 14.22 x 13.46 x 10 mm -
RS Stock No. 167-0563
Mfr. Part No.B82801C0565A100
BrandEPCOS
MYR7.814
Each (On a Reel of 200)
units
40:1 - - - - 40A - - -40°C - +125°C - 14.22 x 13.46 x 10 mm -
RS Stock No. 871-1610
Mfr. Part No.B82801B0324A040
BrandEPCOS
MYR11.90
Each (In a Bag of 3)
units
20:1 - - - - 20A - - -40°C - +125°C - 8.13 x 7.11 x 5.08 mm -
RS Stock No. 871-1641
Mfr. Part No.B82801C0565A100
BrandEPCOS
MYR13.317
Each (In a Bag of 3)
units
40:1 - - - - 40A - - -40°C - +125°C - 14.22 x 13.46 x 10 mm -
RS Stock No. 871-1629
Mfr. Part No.B82801B0504A050
BrandEPCOS
MYR11.00
Each (In a Bag of 3)
units
20:1 - - - - 20A - - -40°C - +125°C - 8.13 x 7.11 x 5.08 mm -
RS Stock No. 167-0523
Mfr. Part No.B82801A0743A030
BrandEPCOS
MYR9.241
Each (On a Reel of 600)
units
7:1 - - - - 7A - - -40°C - +125°C - 4.7 x 3.5 x 3.5 mm -
RS Stock No. 871-1635
Mfr. Part No.B82801B0925A200
BrandEPCOS
MYR10.003
Each (In a Bag of 3)
units
20:1 - - - - 20A - - -40°C - +125°C - 8.13 x 7.11 x 5.08 mm -
RS Stock No. 167-0137
Mfr. Part No.B82801B0925A200
BrandEPCOS
MYR5.81
Each (On a Reel of 900)
units
20:1 - - - - 20A - - -40°C - +125°C - 8.13 x 7.11 x 5.08 mm -
RS Stock No. 871-1626
Mfr. Part No.B82801B0803A020
BrandEPCOS
MYR11.25
Each (In a Bag of 3)
units
20:1 - - - - 20A - - -40°C - +125°C - 8.13 x 7.11 x 5.08 mm -
RS Stock No. 167-0564
Mfr. Part No.B82801C2245A200
BrandEPCOS
MYR8.34
Each (On a Reel of 200)
units
40:1 - - - - 40A - - -40°C - +125°C - 14.22 x 13.46 x 10 mm -
RS Stock No. 162-0292
Mfr. Part No.B82801B0803A020
BrandEPCOS
MYR5.703
Each (On a Reel of 900)
units
20:1 - - - - 20A - - -40°C - +125°C - 8.13 x 7.11 x 5.08 mm -
RS Stock No. 871-1613
Mfr. Part No.B82801B0205A100
BrandEPCOS
MYR8.087
Each (In a Bag of 3)
units
20:1 - - - - 20A - - -40°C - +125°C - 8.13 x 7.11 x 5.08 mm -
RS Stock No. 871-1607
Mfr. Part No.B82801A0743A030
BrandEPCOS
MYR16.273
Each (In a Bag of 3)
units
7:1 - - - - 7A - - -40°C - +125°C - 4.7 x 3.5 x 3.5 mm -
RS Stock No. 162-0255
Mfr. Part No.B82801B0504A050
BrandEPCOS
MYR5.703
Each (On a Reel of 900)
units
20:1 - - - - 20A - - -40°C - +125°C - 8.13 x 7.11 x 5.08 mm -
RS Stock No. 162-0254
Mfr. Part No.B82801B0324A040
BrandEPCOS
MYR5.798
Each (On a Reel of 900)
units
20:1 - - - - 20A - - -40°C - +125°C - 8.13 x 7.11 x 5.08 mm -
RS Stock No. 871-1648
Mfr. Part No.B82801C2245A200
BrandEPCOS
MYR14.933
Each (In a Bag of 3)
units
40:1 - - - - 40A - - -40°C - +125°C - 14.22 x 13.46 x 10 mm -