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. 399-7244
FabrikantnummerASM-010
FabrikantNuvotem Talema
€ 4,21
Each
Aantal stuks
- - - - - - 10A - -40°C +120°C 20.4 x 17.2 x 9.53 mm - PCB Mount -
RS-stocknr. 668-4051
FabrikantnummerCT105F100/5-2.5/1
FabrikantHOBUT
€ 39,65
Each
Aantal stuks
100:5 21mm Base Mounted 79mm 105mm 53mm - - -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. 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. 914-5266
FabrikantnummerCT160-5-G7
FabrikantHOBUT
€ 22,47
Each
Aantal stuks
- - - - - - - - -30°C +85°C 60 x 43 x 85 mm - DIN Rail Series 16
RS-stocknr. 871-1641
FabrikantnummerB82801C0565A100
FabrikantEPCOS
€ 3,573
Each (In a Bag of 3)
Aantal stuks
- - - - - - 40A - -40°C +125°C 14.22 x 13.46 x 10 mm - Surface Mount -
RS-stocknr. 167-0563
FabrikantnummerB82801C0565A100
FabrikantEPCOS
€ 1,852
Each (On a Reel of 200)
Aantal stuks
- - - - - - 40A - -40°C +125°C 14.22 x 13.46 x 10 mm - Surface Mount -
RS-stocknr. 914-5290
FabrikantnummerCTSCMWH30/0.333V
FabrikantHOBUT
€ 21,15
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Aantal stuks
- 10mm Split Core - - - 30A 333 mV -15°C +50°C 28.7 x 26.4 x 41.7 mm Multi Function Meter Cable -
RS-stocknr. 914-5262
FabrikantnummerCT160-5-F7
FabrikantHOBUT
€ 22,47
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Aantal stuks
- - - - - - - - -30°C +85°C 60 x 43 x 85 mm - DIN Rail Series 16
RS-stocknr. 173-0067
FabrikantnummerAZ-0750
FabrikantNuvotem Talema
€ 4,333
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Aantal stuks
- - - - - - 40A - -40°C +85°C 19.0 x 11.5 x 21.5 mm - Flying Lead -
RS-stocknr. 751-1633
Fabrikantnummer93489 P1
FabrikantNuvotem Talema
€ 14,88
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Aantal stuks
- - - - - - 600A - -20°C +70°C 80 (Dia.) x 20 mm - Stand Alone -
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. 914-5278
FabrikantnummerCT160-5-K8
FabrikantHOBUT
€ 23,45
Each
Aantal stuks
- - - - - - - - -30°C +85°C 60 x 43 x 85 mm - DIN Rail Series 16
RS-stocknr. 914-5317
FabrikantnummerCT140F-400/5-2.5/1-31
FabrikantHOBUT
€ 49,57
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Aantal stuks
- 31mm - - - - - - -30°C +80°C 140 x 90 x 38 mm - Foot CT140
RS-stocknr. 914-5275
FabrikantnummerCT160-5-H7
FabrikantHOBUT
€ 23,45
Each
Aantal stuks
- - - - - - - - -30°C +85°C 60 x 43 x 85 mm - DIN Rail Series 16
RS-stocknr. 775-4931
FabrikantnummerACX-1100
FabrikantNuvotem Talema
€ 3,06
Each
Aantal stuks
- - - - - - 100A - -40°C +85°C 34.9 x 34.9 x 14.3 mm - - -
RS-stocknr. 250-0142
FabrikantnummerTRA12UN100
FabrikantCarel
€ 11,90
Each
Aantal stuks
- - - 47mm 58mm 33mm - - - - - 12/24Vac controllers Surface Mount -
RS-stocknr. 668-4067
FabrikantnummerCT105F250/5-2.5/1
FabrikantHOBUT
€ 42,96
Each
Aantal stuks
250:5 21mm Base Mounted 79mm 105mm 53mm - - -30°C +80°C - - - -
RS-stocknr. 331-339
FabrikantnummerCT132M100/5-2.5/1
FabrikantHOBUT
€ 14,55
Each
Aantal stuks
100:5 21mm DIN Rail Mounted 65mm 45mm 30mm - - -30°C +85°C - - - -
RS-stocknr. 173-0062
FabrikantnummerACX-1100
FabrikantNuvotem Talema
€ 3,033
Each (In a Box of 72)
Aantal stuks
- - - - - - 100A - -40°C +85°C 34.9 x 34.9 x 14.3 mm - - -
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