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.


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รายละเอียดสินค้า / Description ราคา / 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. 832-9857
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.L01-8001
Brand :Alttec
THB458.64
Each
Units
50:5 21.5mm Clip Fit 65mm 45mm 30mm - - - +40°C 65 x 45 x 67 mm - - -
RS Stock No. 832-9867
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.L01-8005
Brand :Alttec
THB412.80
Each
Units
150:5 21.5mm Clip Fit 65mm 45mm 30mm - - - +40°C 65 x 45 x 67 mm - - -
RS Stock No. 832-9848
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.L01-8506
Brand :Alttec
THB683.53
Each
Units
100:5 28mm Clip Fit 78.5mm 61mm 40mm - - - +40°C 78.5 x 61 x 72 mm - - -
RS Stock No. 832-9876
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.L01-8007
Brand :Alttec
THB457.16
Each
Units
200:5 21.5mm Clip Fit 65mm 45mm 30mm - - - +40°C 65 x 45 x 67 mm - - -
RS Stock No. 832-9851
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.L01-8002
Brand :Alttec
THB412.13
Each
Units
100:1 21.5mm Clip Fit 65mm 45mm 30mm - - - +40°C 65 x 45 x 67 mm - - -
RS Stock No. 832-9863
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.L01-8004
Brand :Alttec
THB457.89
Each
Units
150:1 21.5mm Clip Fit 65mm 45mm 30mm - - - +40°C 65 x 45 x 67 mm - - -
RS Stock No. 832-9879
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.L01-8009
Brand :Alttec
THB457.01
Each
Units
250:5 21.5mm Clip Fit 65mm 45mm 30mm - - - +40°C 65 x 45 x 67 mm - - -
RS Stock No. 832-9839
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.L01-8501
Brand :Alttec
THB865.73
Each
Units
50:5 28mm - 78.5mm 61mm 72mm - - - +40°C - - - -
RS Stock No. 832-9860
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.L01-8003
Brand :Alttec
THB412.80
Each
Units
100:5 21.5mm Clip Fit 65mm 45mm 30mm - - - +40°C 65 x 45 x 67 mm - - -
RS Stock No. 832-9854
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.L01-8000
Brand :Alttec
THB492.29
Each
Units
50:1 21.5mm Clip Fit 65mm 45mm 30mm - - - +40°C 65 x 45 x 67 mm - - -
RS Stock No. 832-9835
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.L01-8500
Brand :Alttec
THB865.73
Each
Units
40:5 28mm Clip Fit 78.5mm 61mm 40mm - - - +40°C 78.5 x 61 x 72 mm - - -
RS Stock No. 832-9841
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.L01-8508
Brand :Alttec
THB733.68
Each
Units
150:5 28mm Clip Fit 78.5mm 61mm 40mm - - - +40°C 78.5 x 61 x 72 mm - - -
RS Stock No. 832-9845
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.L01-8510
Brand :Alttec
THB755.69
Each
Units
250:5 28mm Clip Fit 78.5mm 61mm 40mm - - - +40°C 78.5 x 61 x 72 mm - - -