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. 173-0069
FabrikantnummerAC-1075
FabrikantNuvotem Talema
€ 2,77
Each (In a Box of 60)
Aantal stuks
- - - - - - 75A - -40°C +120°C 38.1 x 15.9 x 38.1 mm - Through Hole -
RS-stocknr. 399-7339
FabrikantnummerAS-104
FabrikantNuvotem Talema
€ 2,96
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Aantal stuks
- - - - - - 15A - -40°C +120°C 17.2 x 20.4 x 9.53 mm - PCB Mount -
RS-stocknr. 537-4536
FabrikantnummerAC-1040
FabrikantNuvotem Talema
€ 3,57
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Aantal stuks
- - - - - - 40A - -40°C +120°C 34.9 x 14.3 x 34.9 mm - PCB Mount -
RS-stocknr. 124-3883
FabrikantRS PRO
€ 3,28
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Aantal stuks
- - - - - - 5 → 50A - -40°C +120°C 32 x 20.5 x 35 mm - PCB Mount -
RS-stocknr. 886-2180
FabrikantnummerXM19-375151S000000
FabrikantSifam Tinsley
€ 25,31
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Aantal stuks
800:5 50mm Base Mounted - - - - - - - 86 x 45 x 110 mm - Surface Mount Omega XMER
RS-stocknr. 832-9839
FabrikantnummerL01-8501
FabrikantAlttec
€ 21,28
Each
Aantal stuks
50:5 28mm - 78.5mm 61mm 72mm - - - +40°C - - - -
RS-stocknr. 533-0643
FabrikantnummerCTSCM40-200/5
FabrikantHOBUT
€ 46,27
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Aantal stuks
200:5 - Clip Fit 104.5mm 116mm 35.5mm - - -30°C +80°C - - - -
RS-stocknr. 729-5514
FabrikantnummerAC-1075
FabrikantNuvotem Talema
€ 3,08
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Aantal stuks
- - - - - - 75A - -40°C +120°C 38.1 x 15.9 x 38.1 mm - Through Hole -
RS-stocknr. 399-7250
FabrikantnummerASM-050
FabrikantNuvotem Talema
€ 3,08
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Aantal stuks
- - - - - - 50A - -40°C +120°C 35 x 32 x 20.5 mm - PCB Mount -
RS-stocknr. 173-0055
FabrikantnummerAX-1500
FabrikantNuvotem Talema
€ 2,26
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Aantal stuks
- - - - - - 15A - -40°C +120°C 12.7 x 17 x 9.53 mm - Through Hole -
RS-stocknr. 173-0220
FabrikantRS PRO
€ 3,027
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Aantal stuks
- - - - - - 25A - -40°C +85°C 19 x 11.5 x 21.5 mm - - -
RS-stocknr. 751-1617
Fabrikantnummer93482 P1
FabrikantNuvotem Talema
€ 15,02
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Aantal stuks
- - - - - - 100A - -20°C +70°C 70 (Dia.) x 36 mm - Stand Alone -
RS-stocknr. 313-801
FabrikantnummerCT174M500/5-2.5/1-001
FabrikantHOBUT
€ 17,45
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Aantal stuks
500:5 40mm Base Mounted 95mm 70mm 55mm - - -30°C +85°C - - - -
RS-stocknr. 729-5505
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FabrikantNuvotem Talema
€ 3,02
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Aantal stuks
- - - - - - 60A - -40°C +120°C 38.1 x 15.9 x 38.1 mm - Through Hole -
RS-stocknr. 106-8532
Fabrikantnummer56100C
€ 1,352
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- - - - - - 10A - -40°C +85°C 16.79 x 8.89 x 20.19 mm - Through Hole -
RS-stocknr. 351-910
FabrikantnummerMI100
FabrikantCarlo Gavazzi
€ 49,63
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Aantal stuks
- - - 67.5mm 95mm 20mm - - -20°C +60°C - - - -
RS-stocknr. 313-839
FabrikantnummerCT173M120/5-2.5/1-002
FabrikantHOBUT
€ 15,76
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120:5 40mm Base Mounted 95mm 70mm 55mm - - -30°C +85°C - - - -
RS-stocknr. 124-2469
FabrikantnummerP01379606
€ 254,79
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250:1 24mm Split Core - - - 250A 1 A -20°C +50°C 45 x 33.7 x 74.5 mm ENERIUM Power Monitors, ULYS Submeters Plug In TC CLIP
RS-stocknr. 331-367
FabrikantnummerCT164M600/5-5/0.5-001
FabrikantHOBUT
€ 22,80
Each
Aantal stuks
600:5 28mm Base Mounted 78mm 60mm 45mm - - -30°C +85°C - - - -
RS-stocknr. 871-1613
FabrikantnummerB82801B0205A100
FabrikantEPCOS
€ 2,423
Each (In a Bag of 3)
Aantal stuks
- - - - - - 20A - -40°C +125°C 8.13 x 7.11 x 5.08 mm - Surface Mount -
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