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 41 - 60 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. 124-3883
BrandRS PRO
SGD9.64
Each
units
- - - - - - 5 → 50A - -40°C +120°C 32 x 20.5 x 35 mm - PCB Mount -
RS Stock No. 171-8781
BrandRS PRO
SGD26.79
Each
units
100:5 30 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. 171-8836
BrandRS PRO
SGD104.34
Each
units
1500:5 38 x 128mm Base Mounted 170mm 99mm 45mm 1.5kA 5 A -5°C +55°C 99 x 45 x 170 mm - Surface Mount -
RS Stock No. 171-8794
BrandRS PRO
SGD22.81
Each
units
600:5 40 x 11mm Clip Fit 78mm 62mm 40mm 600A 5 A -5°C +55°C 62 x 40 x 78 mm - Surface Mount -
RS Stock No. 171-8779
BrandRS PRO
SGD20.70
Each
units
600:5 30 x 10mm Clip Fit 70mm 50mm 31mm 600A 5 A -5°C +55°C 50 x 31 x 70 mm - Surface Mount -
RS Stock No. 124-3894
BrandRS PRO
SGD7.12
Each
units
- - - - - - 100 → 250A - -55°C +130°C 44.5 x 14.3 x 44.5 mm - PCB Mount -
RS Stock No. 171-8756
BrandRS PRO
SGD18.92
Each
units
125:5 21 x 10mm Clip Fit 65mm 45mm 40mm 125A 5 A -5°C +55°C 45 x 40 x 65 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. 171-8860
BrandRS PRO
SGD34.21
Each
units
40:5 74 x 45mm Clip Fit 98mm 74mm 45mm 40A 5 A -5°C +55°C 74 x 45 x 98 mm - Surface Mount -
RS Stock No. 171-8810
BrandRS PRO
SGD42.87
Each
units
1500:5 61 x 51mm Clip Fit 110mm 86mm 45mm 1.5kA 5 A -5°C +55°C 86 x 45 x 110 mm - Surface Mount -
RS Stock No. 171-8824
BrandRS PRO
SGD37.29
Each
units
100:5 35mm Base Mounted 87.5mm 105mm 38mm 100A 5 A - - 105 x 38 x 87.5 mm MCCB Surface Mount -
RS Stock No. 171-8793
BrandRS PRO
SGD30.50
Each
units
400:1 40 x 11mm - 78mm 62mm 40mm - - - - 62 x 40 x 78 mm - - -
RS Stock No. 171-8854
BrandRS PRO
SGD80.60
Each
units
600:5 55 x 43mm Base Mounted 125mm 108mm 51mm 600A 5 A +20°C +70°C 108 x 51 x 125 mm - Surface Mount -
RS Stock No. 173-0219
BrandRS PRO
SGD15.54
Each (In a Box of 18)
units
- - - - - - 200 → 500A - -55°C +130°C 55.6 x 20.6 x 55.6 mm - PCB Mount -
RS Stock No. 171-8839
BrandRS PRO
SGD121.98
Each
units
2500:5 38 x 128mm Base Mounted 170mm 99mm 45mm 2.5kA 5 A -5°C +55°C 99 x 45 x 170 mm - Surface Mount -
RS Stock No. 171-8833
BrandRS PRO
SGD43.56
Each
units
600:5 45mm Base Mounted 102.5mm 141mm 38mm 600A 5 A - - 141 x 38 x 102.5 mm MCCB Surface Mount -
RS Stock No. 124-3881
BrandRS PRO
SGD4.05
Each
units
- - - - - - 15A - -40°C +120°C 17.2 x 9.53 x 20.4 mm - PCB Mount -
RS Stock No. 171-8760
BrandRS PRO
SGD18.92
Each
units
200:5 21 x 10mm Clip Fit 65mm 45mm 40mm 200A 5 A -5°C +55°C 45 x 40 x 65 mm - Surface Mount -
RS Stock No. 171-8845
BrandRS PRO
SGD121.98
Each
units
2500:5 101 x 56mm Clip Fit 170mm 130mm 60mm 2.5kA 5 A -5°C +55°C 130 x 60 x 170 mm - Surface Mount -
RS Stock No. 171-8800
BrandRS PRO
SGD39.64
Each
units
500:5 41 x 41mm Clip Fit 98mm 74mm 45mm 500A 5 A -5°C +55°C 74 x 45 x 98 mm - Surface Mount -
Related Products
The 5400 series of current sense transformers are ...
Description:
The 5400 series of current sense transformers are designed to monitor AC currentsThe transformers can be used for high frequency current sensingSuitable for switched-mode power supplies, motor control, and electronic lighting ballastsSurface mount, J-STD-020C reflow.
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 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 ...