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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Rincian Komponen Brand Stock Current Ratio Input Current Inner Diameter Transformer Type Internal Diameter Overall Height Outside Diameter Overall Width Length Overall Depth Width Input Current Depth Output Current Dimensions Minimum Temperature Weight Maximum Temperature Dimensions Series For Use With Mounting Type Primary Current Rating Secondary DC Resistance Primary DC Resistance
DIN rail mount for TRB 60 Socomec 0 - - - - - - - - - - - - - - - - - - - - TRB 60 Current Transformers - - - -
DIN rail mounting for TCA 14/21 Socomec 0 - - - - - - - - - - - - - - - - - - - - TCA 14/21 Current Transformers - - - -
Transformer with primary winding TRB 70 Socomec 0 - 25A - DIN Rail Mounted - 85.5mm - 71mm - 45mm - 25A - 5 A 85.5 x 71 x 45 mm - - - 85.5 x 71 x 45 mm - Energy Meters, Mutlfunction Meters DIN Rail - - -
transformer with cable passing TCA 21 60 Socomec 0 - 60A - DIN Rail Mounted - 65mm - 45mm - 30mm - 60A - 5 A 65 x 45 x 30 mm - - - 65 x 45 x 30 mm - Energy Meters, Mutlfunction Meters DIN Rail - - -
transformer with primary winding TRB 60 Socomec 0 - 10A - DIN Rail Mounted - 75.5mm - 61mm - 35mm - 10A - 5 A 75.5 x 61 x 35 mm - - - 75.5 x 61 x 35 mm - Energy Meters, Mutlfunction Meters DIN Rail - - -
Transformer Zero phase ID7.4mm OD21.8mm
  • S$ 15,09
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KEMET 150 - 30A - - 7.4mm - 19.3mm - - - 21.8mm 30A 8.5mm - 21.8 x 8.5mm -20°C 4.3g +80°C 21.8 x 8.5mm - - - 30A 300Ω 300Ω
Transformer Zero phase ID6.0mm OD19.0mm
  • S$ 7,152
  • Each (In a Box of 120)
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KEMET 120 - 15A - - 6mm - 17.5mm - - - 19mm 15A 6.7mm - 19 x 6.7mm -20°C 2.3g +80°C 19 x 6.7mm - - - 15A 1000Ω 1000Ω
Transformer Zero phase ID7.2mm OD22.4mm
  • S$ 20,06
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KEMET 80 - 30A - - 7.2mm - 19.3mm - 45mm - 22.4mm 30A 8.3mm - 45 x 22.4 x 8.3mm -20°C 4.1g +80°C 45 x 22.4 x 8.3mm - - - 30A 300Ω 300Ω
Transformer Zero phase ID8.9mm OD24.7mm
  • S$ 20,33
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KEMET 70 - 30A - - 8.9mm - 21.8mm - 80mm - 24.7mm 30A 8.3mm - 80 x 24.7 x 8.3mm -20°C 5.9g +80°C 80 x 24.7 x 8.3mm - - - 30A 300Ω 300Ω
Transformer Zero phase ID11.0mm OD30.5mm
  • S$ 27,62
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KEMET 50 - 60A - - 11mm - 28mm - 67mm - 30.5mm 60A 10.5mm - 67 x 30.5 x 10.5mm -20°C 11.9g +80°C 67 x 30.5 x 10.5mm - - - 60A 300Ω 300Ω
Transformer Zero phase ID16.5mm OD34.5mm
  • S$ 33,92
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KEMET 50 - 125A - - 16.5mm - 32mm - 67mm - 34.5mm 125A 10.8mm - 67 x 34.5 x 10.8mm -20°C 16.5g +80°C 67 x 34.5 x 10.8mm - - - 125A 300Ω 300Ω
Current sensor CT TR-32 160-600A Socomec 0 - - - Split Core - 86mm - 53mm - 47mm - - - - 53 x 47 x 86 mm -10°C - +55°C 53 x 47 x 86 mm - DIRIS B, DIRIS Digiware, DIRIS A-40 Cable Mount - - -
Dold RN 5883, Current Transformer, , 3A Input,
  • No. Stok RS 181-2770
  • Merek Dold
  • Pbrk. No. Komp. ND5015/024/61
Dold 0 - 3A - - - 54mm - 82mm - 46mm - 3A - - 82 x 46 x 54 mm -40°C - +60°C 82 x 46 x 54 mm RN 5883 - DIN Rail - - -
Dold RN 5883, Current Transformer, , 3A Input,
  • No. Stok RS 181-2771
  • Merek Dold
  • Pbrk. No. Komp. ND5015/035/61
Dold 0 - 3A - - - 67mm - 88mm - 46mm - 3A - - 88 x 46 x 67 mm -40°C - +60°C 88 x 46 x 67 mm RN 5883 - DIN Rail - - -
Socomec TCA 14, Current Transformer Current Transformer, , 40A Input, Socomec 0 - 40A - Current Transformer - 65mm - 45mm - 30mm - 40A - - 45 x 30 x 65 mm - - - 45 x 30 x 65 mm TCA 14 Measurement Devices DIN Rail - - -
Socomec TCA 14, Current Transformer Current Transformer, , 40A Input, Socomec 0 - 40A - Current Transformer - 65mm - 45mm - 30mm - 40A - - 45 x 30 x 65 mm - - - 45 x 30 x 65 mm TCA 14 Measurement Devices DIN Rail - - -
Socomec TE-18, Current Transformer, , 20A Input, 24 A Output Socomec 0 - 20A - - - 45mm - 28mm - 20mm - 20A - 24 A 28 x 20 x 45 mm -10°C - +70°C 28 x 20 x 45 mm TE-18 DIRIS B-30, DIRIS Digiware Cable Mount - - -
Socomec TR-10, Current Transformer, , 63A Input, 75.6 A Output Socomec 0 - 63A - - - 44mm - 28mm - 26mm - 63A - 75.6 A 28 x 26 x 44 mm -10°C - +70°C 28 x 26 x 44 mm TR-10 DIRIS A-40, DIRIS B, DIRIS Digiware Cable Mount - - -
Transformer Zero phase ID11.0mm OD30.5mm KEMET 0 - 60A - - 11mm - 28mm - 67mm - 30.5mm 60A 10.5mm - 67 x 30.5 x 10.5mm -20°C 11.9g +80°C 67 x 30.5 x 10.5mm - - - 60A 300Ω 300Ω
Transformer Zero phase ID16.5mm OD34.5mm KEMET 0 - 125A - - 16.5mm - 32mm - 67mm - 34.5mm 125A 10.8mm - 67 x 34.5 x 10.8mm -20°C 16.5g +80°C 67 x 34.5 x 10.8mm - - - 125A 300Ω 300Ω
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