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 Overall Height Sensor Technology Overall Width Supply Voltage Input Current Overall Depth Output Current Minimum Temperature Maximum Temperature Dimensions For Use With
RS Stock No. 173-0218
BrandRS PRO
$27.566
Each (In a Box of 25)
units
250:1 - - - - - - 250A - - -55°C +130°C 44.5 x 14.3 x 44.5 mm -
RS Stock No. 124-3894
BrandRS PRO
$5.58
Each
units
250:1 - - - - - - 250A - - -55°C +130°C 44.5 x 14.3 x 44.5 mm -
RS Stock No. 124-3897
BrandRS PRO
$9.04
Each
units
50:1 - - - - - - 50A - - -40°C +85°C 19 x 11.5 x 21.5 mm -
RS Stock No. 124-3881
BrandRS PRO
$4.39
Each
units
15:1 - - - - - - 15A - - -40°C +120°C 17.2 x 9.53 x 20.4 mm -
RS Stock No. 173-0045
BrandRS PRO
$3.442
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. 124-3896
BrandRS PRO
$7.08
Each
units
25:1 - - - - - - 25A - - -40°C +85°C 19 x 11.5 x 21.5 mm -
RS Stock No. 173-0181
BrandRS PRO
$4.774
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. 124-3895
BrandRS PRO
$18.33
Each
units
500:1 - - - - - - 500A - - -55°C +130°C 55.6 x 20.6 x 55.6 mm -
RS Stock No. 173-0219
BrandRS PRO
$14.614
Each (In a Box of 18)
units
500:1 - - - - - - 500A - - -55°C +130°C 55.6 x 20.6 x 55.6 mm -
RS Stock No. 173-0220
BrandRS PRO
$5.213
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. 124-3882
BrandRS PRO
$6.72
Each
units
10:1 - - - - - - 10A - - -40°C +120°C 17.2 x 9.53 x 20.4 mm -
RS Stock No. 124-3879
BrandRS PRO
$2.28
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
$1.696
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. 124-3899
BrandRS PRO
$6.39
Each
units
7.5:1 - - - - - - 7.5A - - -40°C +120°C 17.2 x 9.53 x 20.4 mm -
RS Stock No. 173-0044
BrandRS PRO
$1.82
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. 173-0216
BrandRS PRO
$5.042
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 -
RS Stock No. 124-3880
BrandRS PRO
$2.25
Each
units
15:1 - - - - - - 15A - - -40°C +120°C 17.2 x 9.53 x 20.4 mm -
RS Stock No. 173-0198
BrandRS PRO
$6.169
Each (In a Box of 176)
units
375:1 - - - - - - 375A - - -55°C +130°C 30.2 x 14.3 x 30.2 mm -
RS Stock No. 124-3889
BrandRS PRO
$7.76
Each
units
375:1 - - - - - - 375A - - -55°C +130°C 30.2 x 14.3 x 30.2 mm -
RS Stock No. 173-0236
BrandRS PRO
$3.009
Each (In a Box of 351)
units
15:1 - - - - - - 15A - - -40°C +120°C 17.2 x 9.53 x 20.4 mm -