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 81 - 100 of 769 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. 171-8848
BrandRS PRO
MYR183.13
Each
units
200:5 33 x 23mm Base Mounted 106mm 93mm 40mm 200A 5 A +20°C +70°C 93 x 40 x 106 mm - Surface Mount -
RS Stock No. 171-8854
BrandRS PRO
MYR271.10
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. 171-8797
BrandRS PRO
MYR101.52
Each
units
- - - - - - - - - - - - - -
RS Stock No. 124-3882
BrandRS PRO
MYR20.83
Each
units
- - - - - - 1 → 10A - -40°C +120°C 17.2 x 9.53 x 20.4 mm - PCB Mount -
RS Stock No. 171-8805
BrandRS PRO
MYR129.80
Each
units
1000:5 61 x 51mm Clip Fit 110mm 86mm 45mm 1kA 5 A -5°C +55°C 86 x 45 x 110 mm - Surface Mount -
RS Stock No. 171-8751
BrandRS PRO
MYR60.04
Each
units
60:5 21 x 10mm Clip Fit 65mm 45mm 40mm 60A 5 A -5°C +55°C 45 x 40 x 65 mm - Surface Mount -
RS Stock No. 171-8858
BrandRS PRO
MYR94.23
Each
units
20:5 62 x 40mm Clip Fit 78mm 62mm 40mm 20A 5 A -5°C +55°C 62 x 40 x 78 mm - Surface Mount -
RS Stock No. 171-8769
BrandRS PRO
MYR50.03
Each
units
150:5 30 x 10mm Clip Fit 70mm 50mm 31mm 150A 5 A -5°C +55°C 50 x 31 x 70 mm - Surface Mount -
RS Stock No. 171-8754
BrandRS PRO
MYR83.38
Each
units
100:1 21 x 10mm - 65mm 45mm 40mm - - - - 45 x 40 x 65 mm - - -
RS Stock No. 171-8794
BrandRS PRO
MYR74.44
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. 173-0238
BrandRS PRO
MYR14.624
Each (In a Box of 220)
units
- - - - - - 50A - -40°C +85°C 23.8 x 11.12 x 23.8 mm - PCB Mount -
RS Stock No. 171-8767
BrandRS PRO
MYR76.11
Each
units
- - - - - - - - - - - - - -
RS Stock No. 171-8775
BrandRS PRO
MYR58.23
Each
units
300:5 30 x 10mm Clip Fit 70mm 50mm 31mm 300A 5 A -5°C +55°C 50 x 31 x 70 mm - Surface Mount -
RS Stock No. 171-8834
BrandRS PRO
MYR283.49
Each
units
1000:5 38 x 128mm Base Mounted 170mm 99mm 45mm 1kA 5 A -5°C +55°C 99 x 45 x 170 mm - Surface Mount -
RS Stock No. 171-8787
BrandRS PRO
MYR71.42
Each
units
200:5 40 x 11mm Clip Fit 78mm 62mm 40mm 200A 5 A -5°C +55°C 62 x 40 x 78 mm - Surface Mount -
RS Stock No. 171-8753
BrandRS PRO
MYR60.04
Each
units
80:5 21 x 10mm Clip Fit 65mm 45mm 40mm 80A 5 A -5°C +55°C 45 x 40 x 65 mm - Surface Mount -
RS Stock No. 171-8781
BrandRS PRO
MYR89.18
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. 171-8776
BrandRS PRO
MYR86.25
Each
units
400:1 30 x 10mm - 70mm 50mm 30mm - - - - 50 x 30 x 70 mm - - -
RS Stock No. 171-8824
BrandRS PRO
MYR124.56
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. 171-8765
BrandRS PRO
MYR50.03
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 -
Related Products
Window type current transformers from Siemens offer a ...
Description:
Window type current transformers from Siemens offer a wide current range, depending on model. • Screw-type terminals• 50-1500 A current range• IP20 protection.
OMEGA XMER Current transformers are square type and ...
Description:
OMEGA XMER Current transformers are square type and encapsulated with UL94V-0 approved polycarbonate. These metering CT’s feature sealable terminal covers and a wide range of primary current ratings. Available in various bus bar sizes, case widths and mounting options. Cost ...
Residual-current transformer for residual current monitoring Bushing opening ...
Description:
Residual-current transformer for residual current monitoring Bushing opening 140 mm Residual current 30 mA...40 A.
Pin-winding increases the primary current of the current ...
Description:
Pin-winding increases the primary current of the current transformer. Consequently, window-type current transformers Can also be used for low primary currents.