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 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-stocknr. 173-0068
FabrikantnummerAZ-1000
FabrikantNuvotem Talema
4,519 €
Each (In a Box of 84)
Aantal stuks
- - - - - - 50A - -40°C +85°C 19.0 x 11.5 x 21.5 mm - Flying Lead -
RS-stocknr. 775-4912
FabrikantnummerAZ-1000
FabrikantNuvotem Talema
4,79 €
Each
Aantal stuks
- - - - - - 50A - -40°C +85°C 19.0 x 11.5 x 21.5 mm - Flying Lead -
RS-stocknr. 729-5501
FabrikantnummerAC-1030
FabrikantNuvotem Talema
2,24 €
Each
Aantal stuks
- - - - - - 30A - -40°C +120°C 30.2 x 14.3 x 30.2 mm - Through Hole -
RS-stocknr. 173-0049
FabrikantnummerAC-1030
FabrikantNuvotem Talema
2,008 €
Each (In a Box of 120)
Aantal stuks
- - - - - - 30A - -40°C +120°C 30.2 x 14.3 x 30.2 mm - Through Hole -
RS-stocknr. 819-9779
FabrikantnummerMini CT Sensor
FabrikantEfergy
10,78 €
Each
Aantal stuks
- 12mm Split Core - - - - - - - - Data Loggers/DAS, Digital or Analog Meters, DMMs, Recorders - -
RS-stocknr. 775-2714
FabrikantnummerCTSCMICRO19-200/5-T-S
FabrikantHOBUT
48,74 €
Each
Aantal stuks
200:5 - Split Core 78mm 58mm 49mm - - -30°C +55°C - - - -
RS-stocknr. 819-9798
Fabrikantnummer140AS
FabrikantEfergy
13,66 €
Each
Aantal stuks
- 19mm - - - - - - - - - Oscilloscopes - -
RS-stocknr. 173-0066
FabrikantnummerAZ-0500
FabrikantNuvotem Talema
4,21 €
Each (In a Box of 84)
Aantal stuks
- - - - - - 25A - -40°C +85°C 19.0 x 11.5 x 21.5 mm - Flying Lead -
RS-stocknr. 775-4909
FabrikantnummerAZ-0500
FabrikantNuvotem Talema
4,18 €
Each
Aantal stuks
- - - - - - 25A - -40°C +85°C 19.0 x 11.5 x 21.5 mm - Flying Lead -
RS-stocknr. 537-4536
FabrikantnummerAC-1040
FabrikantNuvotem Talema
3,57 €
Each
Aantal stuks
- - - - - - 40A - -40°C +120°C 34.9 x 14.3 x 34.9 mm - PCB Mount -
RS-stocknr. 331-597
FabrikantnummerCT132M40/5-1/3
FabrikantHOBUT
13,72 €
Each
Aantal stuks
40:5 21mm DIN Rail Mounted 65mm 45mm 30mm - - -30°C +85°C - - - -
RS-stocknr. 537-4508
FabrikantnummerAC-1015
FabrikantNuvotem Talema
2,42 €
Each (In a Pack of 5)
Aantal stuks
- - - - - - 15A - -40°C +120°C 23.8 x 23.8 x 11.12 mm - PCB Mount -
RS-stocknr. 257-802
FabrikantnummerCT173M150/5-2.5/1-001
FabrikantHOBUT
16,05 €
Each
Aantal stuks
150:5 40mm Base Mounted 95mm 70mm 55mm - - -30°C +85°C - - - -
RS-stocknr. 313-839
FabrikantnummerCT173M120/5-2.5/1-002
FabrikantHOBUT
15,76 €
Each
Aantal stuks
120:5 40mm Base Mounted 95mm 70mm 55mm - - -30°C +85°C - - - -
RS-stocknr. 533-0643
FabrikantnummerCTSCM40-200/5
FabrikantHOBUT
46,27 €
Each
Aantal stuks
200:5 - Clip Fit 104.5mm 116mm 35.5mm - - -30°C +80°C - - - -
RS-stocknr. 331-474
FabrikantnummerCT132M50/5-1/1
FabrikantHOBUT
13,72 €
Each
Aantal stuks
50:5 21mm DIN Rail Mounted 65mm 45mm 30mm - - -30°C +85°C - - - -
RS-stocknr. 123-9539
Fabrikantnummer7KT1200
FabrikantSiemens
83,40 €
Each
Aantal stuks
60:5 13mm Straight Through - - - 60A 5 A - - 105 x 71 x 90 mm - Panel Mount 7KT12
RS-stocknr. 775-4903
FabrikantnummerAZ-0750
FabrikantNuvotem Talema
4,49 €
Each
Aantal stuks
- - - - - - 40A - -40°C +85°C 19.0 x 11.5 x 21.5 mm - Flying Lead -
RS-stocknr. 173-0067
FabrikantnummerAZ-0750
FabrikantNuvotem Talema
4,333 €
Each (In a Box of 84)
Aantal stuks
- - - - - - 40A - -40°C +85°C 19.0 x 11.5 x 21.5 mm - Flying Lead -
RS-stocknr. 537-4520
FabrikantnummerAC-1020
FabrikantNuvotem Talema
3,702 €
Each (In a Pack of 5)
Aantal stuks
- - - - - - 20A - -40°C +120°C 23.8 x 23.8 x 11.12 mm - PCB Mount -
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