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 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. 173-0215
BrandRS PRO
SGD2.865
Each (In a Box of 351)
units
5:1 - - - - 5A - - -40°C - +120°C - 17.2 x 9.53 x 20.4 mm -
RS Stock No. 124-3896
BrandRS PRO
SGD6.08
Each
units
25:1 - - - - 25A - - -40°C - +85°C - 19 x 11.5 x 21.5 mm -
RS Stock No. 173-0220
BrandRS PRO
SGD5.382
Each (In a Box of 140)
units
25:1 - - - - 25A - - -40°C - +85°C - 19 x 11.5 x 21.5 mm -
RS Stock No. 124-3880
BrandRS PRO
SGD2.14
Each
units
15:1 - - - - 15A - - -40°C - +120°C - 17.2 x 9.53 x 20.4 mm -
RS Stock No. 173-0044
BrandRS PRO
SGD1.703
Each (In a Box of 351)
units
15:1 - - - - 15A - - -40°C - +120°C - 17.2 x 9.53 x 20.4 mm -
RS Stock No. 124-3898
BrandRS PRO
SGD3.18
Each
units
5:1 - - - - 5A - - -40°C - +120°C - 17.2 x 9.53 x 20.4 mm -
RS Stock No. 124-3903
BrandRS PRO
SGD6.73
Each
units
120:1 - - - - 120A - - -40°C - +85°C - 17.2 x 9.53 x 20.4 mm -
RS Stock No. 124-3897
BrandRS PRO
SGD5.84
Each
units
50:1 - - - - 50A - - -40°C - +85°C - 19 x 11.5 x 21.5 mm -
RS Stock No. 173-0201
BrandRS PRO
SGD4.743
Each (In a Box of 114)
units
200:1 - - - - 200A - - -55°C - +130°C - 38.1 x 15.9 x 38.1 mm -
RS Stock No. 124-3892
BrandRS PRO
SGD7.65
Each
units
200:1 - - - - 200A - - -55°C - +130°C - 38.1 x 15.9 x 38.1 mm -
RS Stock No. 124-3882
BrandRS PRO
SGD5.45
Each
units
10:1 - - - - 10A - - -40°C - +120°C - 17.2 x 9.53 x 20.4 mm -
RS Stock No. 173-0237
BrandRS PRO
SGD6.125
Each (In a Box of 351)
units
120:1 - - - - 120A - - -40°C - +85°C - 17.2 x 9.53 x 20.4 mm -
RS Stock No. 173-0181
BrandRS PRO
SGD4.467
Each (In a Box of 351)
units
10:1 - - - - 10A - - -40°C - +120°C - 17.2 x 9.53 x 20.4 mm -
RS Stock No. 124-3879
BrandRS PRO
SGD1.91
Each
units
15:1 - - - - 15A - - -40°C - +120°C - 17.2 x 9.53 x 20.4 mm -
RS Stock No. 173-0041
BrandRS PRO
SGD1.74
Each (In a Box of 351)
units
15:1 - - - - 15A - - -40°C - +120°C - 17.2 x 9.53 x 20.4 mm -
RS Stock No. 171-8757
BrandRS PRO
SGD27.01
Each
units
- - - - - - - - - - - - - -
RS Stock No. 171-8791
BrandRS PRO
SGD19.85
Each
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400:5 40 x 11mm Clip Fit - - 400A 5 A 78mm -5°C 62mm +55°C 40mm 62 x 40 x 78 mm -
RS Stock No. 171-8807
BrandRS PRO
SGD37.28
Each
units
1250:5 61 x 51mm Clip Fit - - 1250A 5 A 110mm -5°C 86mm +55°C 45mm 86 x 45 x 110 mm -
RS Stock No. 171-8784
BrandRS PRO
SGD26.06
Each
units
300:5 30 x 11mm Clip Fit - - 300A 5 A 78mm -5°C 62mm +55°C 40mm 62 x 40 x 78 mm -
RS Stock No. 173-0216
BrandRS PRO
SGD5.362
Each (In a Box of 351)
units
7.5:1 - - - - 7.5A - - -40°C - +120°C - 17.2 x 9.53 x 20.4 mm -