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.


...
Read more Read less

Filters

Viewing 1 - 20 of 55 products
Results per page
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. 537-4485
Mfr. Part No.AC-1005
MYR18.28
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. 751-1623
Mfr. Part No.93485 P1
MYR83.78
Each
units
- - - - - - 250A - -20°C +70°C 62 (Dia.) x 20 mm - Stand Alone -
RS Stock No. 399-7244
Mfr. Part No.ASM-010
MYR19.86
Each
units
- - - - - - 10A - -40°C +120°C 20.4 x 17.2 x 9.53 mm - PCB Mount -
RS Stock No. 537-4520
Mfr. Part No.AC-1020
MYR18.09
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. 751-1633
Mfr. Part No.93489 P1
MYR100.25
Each
units
- - - - - - 600A - -20°C +70°C 80 (Dia.) x 20 mm - Stand Alone -
RS Stock No. 173-0060
Mfr. Part No.AC-1200
MYR42.233
Each (In a Box of 27)
units
- - - - - - 200A - -40°C +120°C 55.6 x 20.6 x 55.6 mm - Through Hole -
RS Stock No. 729-5520
Mfr. Part No.AC-1200
MYR46.89
Each
units
- - - - - - 200A - -40°C +120°C 55.6 x 20.6 x 55.6 mm - Through Hole -
RS Stock No. 751-1642
Mfr. Part No.93490 P1
MYR118.60
Each
units
- - - - - - 800A - -20°C +70°C 102 (Dia.) x 20 mm - Stand Alone -
RS Stock No. 173-0070
Mfr. Part No.AX-0500
MYR14.518
Each (In a Box of 250)
units
- - - - - - 5A - -40°C +120°C 12.7 x 17 x 9.53 mm - Through Hole -
RS Stock No. 775-4915
Mfr. Part No.AX-0500
MYR16.28
Each
units
- - - - - - 5A - -40°C +120°C 12.7 x 17 x 9.53 mm - Through Hole -
RS Stock No. 729-5501
Mfr. Part No.AC-1030
MYR21.50
Each
units
- - - - - - 30A - -40°C +120°C 30.2 x 14.3 x 30.2 mm - Through Hole -
RS Stock No. 173-0049
Mfr. Part No.AC-1030
MYR19.211
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. 751-1617
Mfr. Part No.93482 P1
MYR101.19
Each
units
- - - - - - 100A - -20°C +70°C 70 (Dia.) x 36 mm - Stand Alone -
RS Stock No. 173-0066
Mfr. Part No.AZ-0500
MYR25.663
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. 400-8575
Mfr. Part No.AS-100
MYR17.30
Each
units
- - - - - - 15A - -40°C +120°C 17.2 x 20.4 x 9.53 mm - PCB Mount -
RS Stock No. 751-1627
Mfr. Part No.93486 P1
MYR84.65
Each
units
- - - - - - 300A - -20°C +70°C 62 (Dia.) x 20 mm - Stand Alone -
RS Stock No. 775-4909
Mfr. Part No.AZ-0500
MYR28.55
Each
units
- - - - - - 25A - -40°C +85°C 19.0 x 11.5 x 21.5 mm - Flying Lead -
RS Stock No. 751-1636
Mfr. Part No.93487 P1
MYR95.05
Each
units
- - - - - - 400A - -20°C +70°C 80 (Dia.) x 20 mm - Stand Alone -
RS Stock No. 537-4542
Mfr. Part No.AC-1050
MYR21.88
Each
units
- - - - - - 50A - -40°C +120°C 34.9 x 14.3 x 34.9 mm - PCB Mount -
RS Stock No. 775-4943
Mfr. Part No.AP-1000
MYR21.14
Each
units
- - - - - - 10A - -40°C +85°C 17.2 x 9.53 x 20.4 mm - - -