1. Home
  2. Automation & Control Gear
  3. Panel Meters & Components
  4. Current Transformers

Current Transformers

pCurrent 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./p pCurrent transformers can perform circuit control and perform roles for safety protection and current limiting./p p Current transformers are found in:/p ulliGenerating stations,/li liElectrical substations/li liCommercial electric power distribution./li/ul h2Types of Current Transformers/h2 pstrongToroidal Current Transformer/strong - 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./p pstrongWound Current Transformer/strong - 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./p pstrongBar-type Current Transformer/strong – 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./p

...
Read more Read less

Filters

Viewing 1 - 12 of 12 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
Alttec Clip Fit Circuit Transformer, Maximum of +40 °C, 250:5
RS Stock No. 832-9879
Mfr. Part No.L01-8009
BrandAlttec
TWD371.00
Each
units
 250:5 21.5mm Clip Fit 65mm 45mm 30mm - - - +40°C 65 x 45 x 67 mm - - -
Alttec Clip Fit Circuit Transformer, Maximum of +40 °C, 150:1
RS Stock No. 832-9863
Mfr. Part No.L01-8004
BrandAlttec
TWD371.00
Each
units
 150:1 21.5mm Clip Fit 65mm 45mm 30mm - - - +40°C 65 x 45 x 67 mm - - -
Alttec Clip Fit Circuit Transformer, Maximum of +40 °C, 100:1
RS Stock No. 832-9851
Mfr. Part No.L01-8002
BrandAlttec
TWD426.00
Each
units
 100:1 21.5mm Clip Fit 65mm 45mm 30mm - - - +40°C 65 x 45 x 67 mm - - -
Alttec Clip Fit Circuit Transformer, Maximum of +40 °C, 150:5
RS Stock No. 832-9867
Mfr. Part No.L01-8005
BrandAlttec
TWD426.00
Each
units
 150:5 21.5mm Clip Fit 65mm 45mm 30mm - - - +40°C 65 x 45 x 67 mm - - -
Alttec Circuit Transformer, Maximum of +40 °C, 50:5
RS Stock No. 832-9839
Mfr. Part No.L01-8501
BrandAlttec
TWD832.00
Each
units
 50:5 28mm - 78.5mm 61mm 72mm - - - +40°C - - - -
Alttec Clip Fit Circuit Transformer, Maximum of +40 °C, 50:1
RS Stock No. 832-9854
Mfr. Part No.L01-8000
BrandAlttec
TWD426.00
Each
units
 50:1 21.5mm Clip Fit 65mm 45mm 30mm - - - +40°C 65 x 45 x 67 mm - - -
Alttec Clip Fit Circuit Transformer, Maximum of +40 °C, 150:5
RS Stock No. 832-9841
Mfr. Part No.L01-8508
BrandAlttec
TWD705.00
Each
units
 150:5 28mm Clip Fit 78.5mm 61mm 40mm - - - +40°C 78.5 x 61 x 72 mm - - -
Alttec Clip Fit Circuit Transformer, Maximum of +40 °C, 100:5
RS Stock No. 832-9848
Mfr. Part No.L01-8506
BrandAlttec
TWD705.00
Each
units
 100:5 28mm Clip Fit 78.5mm 61mm 40mm - - - +40°C 78.5 x 61 x 72 mm - - -
Alttec Clip Fit Circuit Transformer, Maximum of +40 °C, 100:5
RS Stock No. 832-9860
Mfr. Part No.L01-8003
BrandAlttec
TWD426.00
Each
units
 100:5 21.5mm Clip Fit 65mm 45mm 30mm - - - +40°C 65 x 45 x 67 mm - - -
Alttec Clip Fit Circuit Transformer, Maximum of +40 °C, 40:5
RS Stock No. 832-9835
Mfr. Part No.L01-8500
BrandAlttec
TWD832.00
Each
units
 40:5 28mm Clip Fit 78.5mm 61mm 40mm - - - +40°C 78.5 x 61 x 72 mm - - -
Alttec Clip Fit Circuit Transformer, Maximum of +40 °C, 200:5
RS Stock No. 832-9876
Mfr. Part No.L01-8007
BrandAlttec
TWD426.00
Each
units
 200:5 21.5mm Clip Fit 65mm 45mm 30mm - - - +40°C 65 x 45 x 67 mm - - -
Alttec Clip Fit Circuit Transformer, Maximum of +40 °C, 50:5
RS Stock No. 832-9857
Mfr. Part No.L01-8001
BrandAlttec
TWD426.00
Each
units
 50:5 21.5mm Clip Fit 65mm 45mm 30mm - - - +40°C 65 x 45 x 67 mm - - -
Services
About RS
Hot Topics
Phone us
0800 088 238
© RS Components Ltd
8F.-2, No.1, Zhongzheng Rd., Tucheng Dist., New Taipei City 23670, Taiwan (R.O.C.)
Payment options