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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Description Price Current Ratio Bore Size Transformer Type Overall Height Sensor Technology Overall Width Supply Voltage Input Current Overall Depth Output Current Minimum Temperature Maximum Temperature Dimensions For Use With
RS Stock No. 122-0470
Mfr. Part No.192T3225
BrandSocomec
TWD1,139.00
Each
units
- 26mm - - - - - - - - - - 75.5 x 61 x 48 mm -
RS Stock No. 187-9931
Mfr. Part No.192T2006
BrandSocomec
TWD1,182.00
Each
units
60:5 - DIN Rail Mounted 65mm - 45mm - 60A 30mm 5 A - - 65 x 45 x 30 mm Energy Meters, Mutlfunction Meters
RS Stock No. 122-0467
Mfr. Part No.192T2325
BrandSocomec
TWD1,094.00
Each
units
- 26mm - - - - - - - - - - 75.5 x 61 x 48 mm -
RS Stock No. 122-0466
Mfr. Part No.192T2315
BrandSocomec
TWD1,041.00
Each
units
- 26mm - - - - - - - - - - 75.5 x 61 x 48 mm -
RS Stock No. 122-0550
Mfr. Part No.48290503
BrandSocomec
TWD1,368.00
Each
units
- - - - - - - - - - -10°C +70°C 71 x 35 x 32.5 mm DIRIS B-30, DIRIS Digiware
RS Stock No. 184-9457
Mfr. Part No.48290558
BrandSocomec
TWD3,013.00
Each
units
- - Split Core 86mm - 53mm - - 47mm - -10°C +55°C 53 x 47 x 86 mm DIRIS A-40, DIRIS B, DIRIS Digiware
RS Stock No. 122-0549
Mfr. Part No.48290502
BrandSocomec
TWD1,517.00
Each
units
- - - - - - - - - - -10°C +70°C 65 x 25 x 32.5 mm DIRIS B-30, DIRIS Digiware
RS Stock No. 182-8467
Mfr. Part No.192T1405
BrandSocomec
TWD1,182.00
Each
units
50:5 - Toroidal Ring 65mm - 45mm - 50A 30mm 5 A - - 45 x 30 x 65 mm Measurement Devices
RS Stock No. 122-0468
Mfr. Part No.192T2340
BrandSocomec
TWD1,313.00
Each
units
- 26mm - - - - - - - - - - 75.5 x 61 x 48 mm -
RS Stock No. 122-0548
Mfr. Part No.48290501
BrandSocomec
TWD663.00
Each
units
- 8.6mm - - - - - - - - -10°C +70°C 45 x 28 x 20 mm DIRIS B-30, DIRIS Digiware
RS Stock No. 122-0476
Mfr. Part No.192T5060
BrandSocomec
TWD1,582.00
Each
units
- 44mm - - - - - - - - - - 98.5 x 86 x 58 mm -
RS Stock No. 187-9962
Mfr. Part No.192T0006
BrandSocomec
TWD59.00
Each
units
- - - - - - - - - - - - - TCA 14/21 Current Transformers
RS Stock No. 122-0464
Mfr. Part No.192T2110
BrandSocomec
TWD915.00
Each
units
- 17.5mm - - - - - - - - - - 65 x 49.5 x 50 mm -
RS Stock No. 122-0552
Mfr. Part No.48290570
BrandSocomec
TWD6,054.00
Each
units
- 55mm - - - - - - - - -10°C +70°C 85 x 18 x 38 mm DIRIS B-30, DIRIS Digiware
RS Stock No. 122-0568
Mfr. Part No.49506200
BrandSocomec
TWD10,866.00
Each
units
400:5 200mm - - - - - 400A - 5 A -40°C +80°C 253 x 51 x 274 mm DIRIS A80, RESYS
RS Stock No. 187-9935
Mfr. Part No.192T0510
BrandSocomec
TWD1,835.00
Each
units
10:5 - DIN Rail Mounted 75.5mm - 61mm - 10A 35mm 5 A - - 75.5 x 61 x 35 mm Energy Meters, Mutlfunction Meters
RS Stock No. 182-8460
Mfr. Part No.48290500
BrandSocomec
TWD656.00
Each
units
20:1 - - 45mm - 28mm - 20A 20mm 24 A -10°C +70°C 28 x 20 x 45 mm DIRIS B-30, DIRIS Digiware
RS Stock No. 187-9941
Mfr. Part No.192T0525
BrandSocomec
TWD1,835.00
Each
units
25:5 - DIN Rail Mounted 85.5mm - 71mm - 25A 45mm 5 A - - 85.5 x 71 x 45 mm Energy Meters, Mutlfunction Meters
RS Stock No. 187-9961
Mfr. Part No.192T0003
BrandSocomec
TWD59.00
Each
units
- - - - - - - - - - - - - TRB 60 Current Transformers
RS Stock No. 182-8466
Mfr. Part No.192T1404
BrandSocomec
TWD1,182.00
Each
units
40:5 - Toroidal Ring 65mm - 45mm - 40A 30mm 5 A - - 45 x 30 x 65 mm Measurement Devices