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. 399-7339
Mfr. Part No.AS-104
$5.61
Each
units
- - - - - - 15A - -40°C +120°C 17.2 x 20.4 x 9.53 mm - PCB Mount -
RS Stock No. 173-0066
Mfr. Part No.AZ-0500
$8.239
Each (In a Box of 84)
units
- - - - - - 25A - -40°C +85°C 19.0 x 11.5 x 21.5 mm - Flying Lead -
RS Stock No. 775-4909
Mfr. Part No.AZ-0500
$9.17
Each
units
- - - - - - 25A - -40°C +85°C 19.0 x 11.5 x 21.5 mm - Flying Lead -
RS Stock No. 399-7244
Mfr. Part No.ASM-010
$7.59
Each
units
- - - - - - 10A - -40°C +120°C 20.4 x 17.2 x 9.53 mm - PCB Mount -
RS Stock No. 537-4485
Mfr. Part No.AC-1005
$5.808
Each (In a Pack of 5)
units
- - - - - - 5A - -40°C +120°C 23.8 x 23.8 x 11.12 mm - PCB Mount -
RS Stock No. 537-4520
Mfr. Part No.AC-1020
$5.808
Each (In a Pack of 5)
units
- - - - - - 20A - -40°C +120°C 23.8 x 23.8 x 11.12 mm - PCB Mount -
RS Stock No. 751-1617
Mfr. Part No.93482 P1
$54.98
Each
units
- - - - - - 100A - -20°C +70°C 70 (Dia.) x 36 mm - Stand Alone -
RS Stock No. 173-0061
Mfr. Part No.AC-1100
$9.322
Each (In a Box of 27)
units
- - - - - - 100A - -40°C +120°C 44.5 x 14.3 x 44.5 mm - Through Hole -
RS Stock No. 729-5517
Mfr. Part No.AC-1100
$10.34
Each
units
- - - - - - 100A - -40°C +120°C 44.5 x 14.3 x 44.5 mm - Through Hole -
RS Stock No. 173-0161
Mfr. Part No.AP-2500
$6.686
Each (In a Box of 250)
units
- - - - - - 15A - -40°C +85°C 17.2 x 9.53 x 20.4 mm - - -
RS Stock No. 775-4959
Mfr. Part No.AP-2500
$7.50
Each
units
- - - - - - 15A - -40°C +85°C 17.2 x 9.53 x 20.4 mm - - -
RS Stock No. 751-1623
Mfr. Part No.93485 P1
$28.12
Each
units
- - - - - - 250A - -20°C +70°C 62 (Dia.) x 20 mm - Stand Alone -
RS Stock No. 173-0049
Mfr. Part No.AC-1030
$6.168
Each (In a Box of 120)
units
- - - - - - 30A - -40°C +120°C 30.2 x 14.3 x 30.2 mm - Through Hole -
RS Stock No. 729-5501
Mfr. Part No.AC-1030
$6.83
Each
units
- - - - - - 30A - -40°C +120°C 30.2 x 14.3 x 30.2 mm - Through Hole -
RS Stock No. 173-0067
Mfr. Part No.AZ-0750
$8.23
Each (In a Box of 84)
units
- - - - - - 40A - -40°C +85°C 19.0 x 11.5 x 21.5 mm - Flying Lead -
RS Stock No. 751-1614
Mfr. Part No.93481 P1
$36.17
Each
units
- - - - - - 60A - -20°C +70°C 70 (Dia.) x 36 mm - Stand Alone -
RS Stock No. 775-4903
Mfr. Part No.AZ-0750
$9.17
Each
units
- - - - - - 40A - -40°C +85°C 19.0 x 11.5 x 21.5 mm - Flying Lead -
RS Stock No. 173-0055
Mfr. Part No.AX-1500
$5.791
Each (In a Box of 250)
units
- - - - - - 15A - -40°C +120°C 12.7 x 17 x 9.53 mm - Through Hole -
RS Stock No. 775-4921
Mfr. Part No.AX-1500
$6.49
Each
units
- - - - - - 15A - -40°C +120°C 12.7 x 17 x 9.53 mm - Through Hole -
RS Stock No. 751-1620
Mfr. Part No.93484 P1
$26.40
Each
units
- - - - - - 200A - -20°C +70°C 62 (Dia.) x 20 mm - Stand Alone -