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 746 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. 124-3898
BrandRS PRO
SGD3.43
Each
units
- - - - - - 5A - -40°C +120°C 17.2 x 9.53 x 20.4 mm - PCB Mount -
RS Stock No. 124-3880
BrandRS PRO
SGD2.10
Each
units
- - - - - - 15A - -40°C +120°C 17.2 x 9.53 x 20.4 mm - PCB Mount -
RS Stock No. 124-3896
BrandRS PRO
SGD5.89
Each
units
- - - - - - 25A - -40°C +85°C 19 x 11.5 x 21.5 mm - - -
RS Stock No. 173-0044
BrandRS PRO
SGD1.852
Each (In a Box of 351)
units
- - - - - - 15A - -40°C +120°C 17.2 x 9.53 x 20.4 mm - PCB Mount -
RS Stock No. 173-0220
BrandRS PRO
SGD5.302
Each (In a Box of 140)
units
- - - - - - 25A - -40°C +85°C 19 x 11.5 x 21.5 mm - - -
RS Stock No. 173-0215
BrandRS PRO
SGD3.087
Each (In a Box of 351)
units
- - - - - - 5A - -40°C +120°C 17.2 x 9.53 x 20.4 mm - PCB Mount -
RS Stock No. 124-3892
BrandRS PRO
SGD4.83
Each
units
- - - - - - 60 → 200A - -55°C +130°C 38.1 x 15.9 x 38.1 mm - PCB Mount -
RS Stock No. 124-3882
BrandRS PRO
SGD6.19
Each
units
- - - - - - 1 → 10A - -40°C +120°C 17.2 x 9.53 x 20.4 mm - PCB Mount -
RS Stock No. 173-0181
BrandRS PRO
SGD5.077
Each (In a Box of 351)
units
- - - - - - 1 → 10A - -40°C +120°C 17.2 x 9.53 x 20.4 mm - PCB Mount -
RS Stock No. 173-0237
BrandRS PRO
SGD6.961
Each (In a Box of 351)
units
- - - - - - 10 → 20A - -40°C +85°C 17.2 x 9.53 x 20.4 mm - PCB Mount -
RS Stock No. 124-3879
BrandRS PRO
SGD2.10
Each
units
- - - - - - 15A - -40°C +120°C 17.2 x 9.53 x 20.4 mm - PCB Mount -
RS Stock No. 124-3897
BrandRS PRO
SGD6.29
Each
units
- - - - - - 50A - -40°C +85°C 19 x 11.5 x 21.5 mm - PCB Mount -
RS Stock No. 173-0041
BrandRS PRO
SGD1.725
Each (In a Box of 351)
units
- - - - - - 15A - -40°C +120°C 17.2 x 9.53 x 20.4 mm - PCB Mount -
RS Stock No. 173-0201
BrandRS PRO
SGD4.346
Each (In a Box of 114)
units
- - - - - - 60 → 200A - -55°C +130°C 38.1 x 15.9 x 38.1 mm - PCB Mount -
RS Stock No. 124-3903
BrandRS PRO
SGD7.65
Each
units
- - - - - - 10 → 20A - -40°C +85°C 17.2 x 9.53 x 20.4 mm - PCB Mount -
RS Stock No. 173-0236
BrandRS PRO
SGD2.815
Each (In a Box of 351)
units
- - - - - - 15A - -40°C +120°C 17.2 x 9.53 x 20.4 mm - PCB Mount -
RS Stock No. 171-8765
BrandRS PRO
SGD14.75
Each
units
100:5 30 x 10mm Clip Fit 70mm 50mm 31mm 100A 5 A -5°C +55°C 50 x 31 x 70 mm - Surface Mount -
RS Stock No. 171-8785
BrandRS PRO
SGD21.16
Each
units
100:5 40 x 11mm Clip Fit 78mm 62mm 40mm 100A 5 A -5°C +55°C 62 x 40 x 78 mm - Surface Mount -
RS Stock No. 171-8844
BrandRS PRO
SGD113.26
Each
units
2000:5 101 x 56mm Clip Fit 170mm 130mm 60mm 2kA 5 A -5°C +55°C 130 x 60 x 170 mm - Surface Mount -
RS Stock No. 173-0184
BrandRS PRO
SGD8.727
Each (In a Box of 98)
units
- - - - - - 5 → 50A - -40°C +120°C 32 x 20.5 x 35 mm - PCB Mount -
Related Products
RS Pro current sense transformers are designed as ...
Description:
RS Pro current sense transformers are designed as a method of controlling, monitoring or measuring AC currents. These current transformers are fully encapsulated for optimal PC board mounting. The sensors serve as feedback elements between the output and the pulse ...
RS Pro toroidal current sensors are fully encapsulated ...
Description:
RS Pro toroidal current sensors are fully encapsulated for optimal mounting to printed circuit boards. Commonly used to detect branch circuit overload, load drop or shut down, accurate and easy to use. These RS Pro current sensors operate as the ...
RS Pro PCB mount current transformers encapsulated in ...
Description:
RS Pro PCB mount current transformers encapsulated in UL94 V0 rated plastic Storage temperature -55°C to +130°C, fully RoHS compliant. Ground fault detectionMeteringAnalog to digital circuitsSensing overload current.
RS Pro high current transformers feature a primary ...
Description:
RS Pro high current transformers feature a primary current range 50-150A, 1% accuracy. These current transformers also have dielectric with stand voltage 4KVrms, operating frequency 50/60 Hz, rated burden resistance 33 Ω, all materials UL94-VO and operating temperature -40°C to ...