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. 124-3893
BrandRS PRO
$10.55
Each
units
200:1 - - - - - - 200A - - -55°C +130°C 38.1 x 15.9 x 38.1 mm -
RS Stock No. 124-3879
BrandRS PRO
$2.52
Each
units
15:1 - - - - - - 15A - - -40°C +120°C 17.2 x 9.53 x 20.4 mm -
RS Stock No. 173-0217
BrandRS PRO
$9.681
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. 173-0041
BrandRS PRO
$2.091
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. 124-3881
BrandRS PRO
$4.83
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
$4.197
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. 124-3880
BrandRS PRO
$2.48
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
$2.244
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. 173-0181
BrandRS PRO
$6.022
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. 124-3882
BrandRS PRO
$7.39
Each
units
10:1 - - - - - - 10A - - -40°C +120°C 17.2 x 9.53 x 20.4 mm -
RS Stock No. 171-8856
BrandRS PRO
$31.00
Each
units
10:5 62 x 40mm Clip Fit 78mm - 62mm - 10A 40mm 5 A -5°C +55°C 62 x 40 x 78 mm -
RS Stock No. 173-0235
BrandRS PRO
$7.118
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. 171-8822
BrandRS PRO
$77.60
Each
units
2500:5 100 x 30mm Clip Fit 155mm - 140mm - 2500A 45mm 5 A -5°C +55°C 140 x 45 x 155 mm -
RS Stock No. 171-8857
BrandRS PRO
$37.53
Each
units
15:5 62 x 40mm Clip Fit 78mm - 62mm - 15A 40mm 5 A -5°C +55°C 62 x 40 x 78 mm -
RS Stock No. 171-8849
BrandRS PRO
$78.61
Each
units
250:5 33 x 23mm Base Mounted 106mm - 93mm - 250A 40mm 5 A +20°C +70°C 93 x 40 x 106 mm -
RS Stock No. 173-0236
BrandRS PRO
$3.34
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. 171-8800
BrandRS PRO
$57.44
Each
units
500:5 41 x 41mm Clip Fit 98mm - 74mm - 500A 45mm 5 A -5°C +55°C 74 x 45 x 98 mm -
RS Stock No. 171-8772
BrandRS PRO
$34.72
Each
units
250:1 30 x 10mm - 70mm - 50mm - - 30mm - - - 50 x 30 x 70 mm -
RS Stock No. 171-8784
BrandRS PRO
$40.27
Each
units
300:5 30 x 11mm Clip Fit 78mm - 62mm - 300A 40mm 5 A -5°C +55°C 62 x 40 x 78 mm -
RS Stock No. 171-8823
BrandRS PRO
$87.10
Each
units
3000:5 100 x 30mm Clip Fit 155mm - 140mm - 3000A 45mm 5 A -5°C +55°C 140 x 45 x 155 mm -