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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Omschrijving Prijs Current Ratio Bore Size Transformer Type Sensor Technology Supply Voltage Input Current Output Current Overall Height Minimum Temperature Overall Width Maximum Temperature Overall Depth Dimensions For Use With
RS-stocknr. 187-9961
Fabrikantnummer192T0003
FabrikantSocomec
€ 1,31
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Aantal stuks
- - - - - - - - - - - - - TRB 60 Current Transformers
RS-stocknr. 187-9962
Fabrikantnummer192T0006
FabrikantSocomec
€ 1,31
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Aantal stuks
- - - - - - - - - - - - - TCA 14/21 Current Transformers
RS-stocknr. 122-0552
Fabrikantnummer48290570
FabrikantSocomec
€ 179,89
Each
Aantal stuks
- 55mm - - - - - - -10°C - +70°C - 85 x 18 x 38 mm DIRIS B-30, DIRIS Digiware
RS-stocknr. 122-0548
Fabrikantnummer48290501
FabrikantSocomec
€ 16,18
Each
Aantal stuks
- 8.6mm - - - - - - -10°C - +70°C - 45 x 28 x 20 mm DIRIS B-30, DIRIS Digiware
RS-stocknr. 122-0466
Fabrikantnummer192T2315
FabrikantSocomec
€ 23,20
Each
Aantal stuks
- 26mm - - - - - - - - - - 75.5 x 61 x 48 mm -
RS-stocknr. 122-0467
Fabrikantnummer192T2325
FabrikantSocomec
€ 24,37
Each
Aantal stuks
- 26mm - - - - - - - - - - 75.5 x 61 x 48 mm -
RS-stocknr. 122-0470
Fabrikantnummer192T3225
FabrikantSocomec
€ 25,38
Each
Aantal stuks
- 26mm - - - - - - - - - - 75.5 x 61 x 48 mm -
RS-stocknr. 182-8468
Fabrikantnummer48290555
FabrikantSocomec
€ 50,76
Each
Aantal stuks
63:1 - - - - 63A 75.6 A 44mm -10°C 28mm +70°C 26mm 28 x 26 x 44 mm DIRIS A-40, DIRIS B, DIRIS Digiware
RS-stocknr. 182-8466
Fabrikantnummer192T1404
FabrikantSocomec
€ 26,34
Each
Aantal stuks
40:5 - Toroidal Ring - - 40A 5 A 65mm - 45mm - 30mm 45 x 30 x 65 mm Measurement Devices
RS-stocknr. 122-0468
Fabrikantnummer192T2340
FabrikantSocomec
€ 29,26
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Aantal stuks
- 26mm - - - - - - - - - - 75.5 x 61 x 48 mm -
RS-stocknr. 182-8460
Fabrikantnummer48290500
FabrikantSocomec
€ 15,82
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Aantal stuks
20:1 - - - - 20A 24 A 45mm -10°C 28mm +70°C 20mm 28 x 20 x 45 mm DIRIS B-30, DIRIS Digiware
RS-stocknr. 122-0471
Fabrikantnummer192T3240
FabrikantSocomec
€ 28,94
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Aantal stuks
- 26mm - - - - - - - - - - 75.5 x 61 x 48 mm -
RS-stocknr. 122-0567
Fabrikantnummer49506120
FabrikantSocomec
€ 118,12
Each
Aantal stuks
250:5 120mm - - - 250A 5 A - -40°C - +80°C - 163 x 26 x 182.5 mm DIRIS A80, RESYS
RS-stocknr. 122-0550
Fabrikantnummer48290503
FabrikantSocomec
€ 40,65
Each
Aantal stuks
- - - - - - - - -10°C - +70°C - 71 x 35 x 32.5 mm DIRIS B-30, DIRIS Digiware
RS-stocknr. 182-8467
Fabrikantnummer192T1405
FabrikantSocomec
€ 26,34
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Aantal stuks
50:5 - Toroidal Ring - - 50A 5 A 65mm - 45mm - 30mm 45 x 30 x 65 mm Measurement Devices
RS-stocknr. 122-0476
Fabrikantnummer192T5060
FabrikantSocomec
€ 35,26
Each
Aantal stuks
- 44mm - - - - - - - - - - 98.5 x 86 x 58 mm -
RS-stocknr. 122-0549
Fabrikantnummer48290502
FabrikantSocomec
€ 36,53
Each
Aantal stuks
- - - - - - - - -10°C - +70°C - 65 x 25 x 32.5 mm DIRIS B-30, DIRIS Digiware
RS-stocknr. 187-9931
Fabrikantnummer192T2006
FabrikantSocomec
€ 26,34
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Aantal stuks
60:5 - DIN Rail Mounted - - 60A 5 A 65mm - 45mm - 30mm 65 x 45 x 30 mm Energy Meters, Mutlfunction Meters
RS-stocknr. 122-0565
Fabrikantnummer49506030
FabrikantSocomec
€ 60,60
Each
Aantal stuks
65:5 30mm - - - 65A 5 A - -40°C - +80°C - 92 x 26 x 103.5 mm DIRIS A80, RESYS
RS-stocknr. 122-0464
Fabrikantnummer192T2110
FabrikantSocomec
€ 20,39
Each
Aantal stuks
- 17.5mm - - - - - - - - - - 65 x 49.5 x 50 mm -