Current Transformers

Current transformers (CT) are devices that are used to transform the current from a high current into a lower current so that the power can then be measured and controlled. The transformers consist of a core, a primary and a secondary winding. 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.


Current transformers can perform circuit control and perform roles for safety protection and current limiting.


Current transformers are found in:


  • Generating stations,

  • Electrical substations

  • Commercial electric power distribution.

Types of Current Transformers


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.


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Description Price Current Ratio Inner Diameter Transformer Type Overall Height Overall Width Overall Depth Input Current Output Current Minimum Temperature Maximum Temperature Dimensions For Use With Mounting Type Series
RS Stock No. 871-1613
Mfr. Part No.B82801B0205A100
BrandEPCOS
SGD1.70
Each (In a Bag of 3)
units
- - - - - - 20A - -40°C +125°C 8.13 x 7.11 x 5.08 mm - Surface Mount -
RS Stock No. 167-0135
Mfr. Part No.B82801B0205A100
BrandEPCOS
SGD2.024
Each (On a Reel of 900)
units
- - - - - - 20A - -40°C +125°C 8.13 x 7.11 x 5.08 mm - Surface Mount -
RS Stock No. 871-1648
Mfr. Part No.B82801C2245A200
BrandEPCOS
SGD4.953
Each (In a Bag of 3)
units
- - - - - - 40A - -40°C +125°C 14.22 x 13.46 x 10 mm - Surface Mount -
RS Stock No. 871-1610
Mfr. Part No.B82801B0324A040
BrandEPCOS
SGD3.817
Each (In a Bag of 3)
units
- - - - - - 20A - -40°C +125°C 8.13 x 7.11 x 5.08 mm - Surface Mount -
RS Stock No. 167-0564
Mfr. Part No.B82801C2245A200
BrandEPCOS
SGD2.86
Each (On a Reel of 200)
units
- - - - - - 40A - -40°C +125°C 14.22 x 13.46 x 10 mm - Surface Mount -
RS Stock No. 871-1626
Mfr. Part No.B82801B0803A020
BrandEPCOS
SGD2.487
Each (In a Bag of 3)
units
- - - - - - 20A - -40°C +125°C 8.13 x 7.11 x 5.08 mm - Surface Mount -
RS Stock No. 162-0254
Mfr. Part No.B82801B0324A040
BrandEPCOS
SGD1.894
Each (On a Reel of 900)
units
- - - - - - 20A - -40°C +125°C 8.13 x 7.11 x 5.08 mm - Surface Mount -
RS Stock No. 871-1616
Mfr. Part No.B82801B0305A125
BrandEPCOS
SGD2.153
Each (In a Bag of 3)
units
- - - - - - 20A - -40°C +125°C 8.13 x 7.11 x 5.08 mm - Surface Mount -
RS Stock No. 871-1629
Mfr. Part No.B82801B0504A050
BrandEPCOS
SGD2.637
Each (In a Bag of 3)
units
- - - - - - 20A - -40°C +125°C 8.13 x 7.11 x 5.08 mm - Surface Mount -
RS Stock No. 167-0562
Mfr. Part No.B82801C0145A050
BrandEPCOS
SGD2.86
Each (On a Reel of 200)
units
- - - - - - 40A - -40°C +125°C 14.22 x 13.46 x 10 mm - Surface Mount -
RS Stock No. 167-0136
Mfr. Part No.B82801B0305A125
BrandEPCOS
SGD2.14
Each (On a Reel of 900)
units
- - - - - - 20A - -40°C +125°C 8.13 x 7.11 x 5.08 mm - Surface Mount -
RS Stock No. 167-0563
Mfr. Part No.B82801C0565A100
BrandEPCOS
SGD2.86
Each (On a Reel of 200)
units
- - - - - - 40A - -40°C +125°C 14.22 x 13.46 x 10 mm - Surface Mount -
RS Stock No. 162-0292
Mfr. Part No.B82801B0803A020
BrandEPCOS
SGD1.894
Each (On a Reel of 900)
units
- - - - - - 20A - -40°C +125°C 8.13 x 7.11 x 5.08 mm - Surface Mount -
RS Stock No. 871-1607
Mfr. Part No.B82801A0743A030
BrandEPCOS
SGD3.823
Each (In a Bag of 3)
units
- - - - - - 7A - -40°C +125°C 4.7 x 3.5 x 3.5 mm - Surface Mount -
RS Stock No. 871-1644
Mfr. Part No.B82801C1265A150
BrandEPCOS
SGD3.81
Each (In a Bag of 3)
units
- - - - - - 40A - -40°C +125°C 14.22 x 13.46 x 10 mm - Surface Mount -
RS Stock No. 871-1641
Mfr. Part No.B82801C0565A100
BrandEPCOS
SGD3.81
Each (In a Bag of 3)
units
- - - - - - 40A - -40°C +125°C 14.22 x 13.46 x 10 mm - Surface Mount -
RS Stock No. 871-1632
Mfr. Part No.B82801C0145A050
BrandEPCOS
SGD3.81
Each (In a Bag of 3)
units
- - - - - - 40A - -40°C +125°C 14.22 x 13.46 x 10 mm - Surface Mount -
RS Stock No. 167-0523
Mfr. Part No.B82801A0743A030
BrandEPCOS
SGD3.249
Each (On a Reel of 600)
units
- - - - - - 7A - -40°C +125°C 4.7 x 3.5 x 3.5 mm - Surface Mount -
RS Stock No. 167-0137
Mfr. Part No.B82801B0925A200
BrandEPCOS
SGD2.065
Each (On a Reel of 900)
units
- - - - - - 20A - -40°C +125°C 8.13 x 7.11 x 5.08 mm - Surface Mount -
RS Stock No. 871-1635
Mfr. Part No.B82801B0925A200
BrandEPCOS
SGD2.697
Each (In a Bag of 3)
units
- - - - - - 20A - -40°C +125°C 8.13 x 7.11 x 5.08 mm - Surface Mount -