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. 914-5326
FabrikantnummerCT140F-600/5-2.5/1-31
FabrikantHOBUT
€ 50,90
Each
Aantal stuks
- 31mm - - - - - - -30°C +80°C 140 x 90 x 38 mm - Foot CT140
RS-stocknr. 775-4934
FabrikantnummerACX-1050
FabrikantNuvotem Talema
€ 3,94
Each
Aantal stuks
- - - - - - 50A - -40°C +85°C 23.8 x 23.8 x 11.12 mm - - -
RS-stocknr. 914-5278
FabrikantnummerCT160-5-K8
FabrikantHOBUT
€ 24,09
Each
Aantal stuks
- - - - - - - - -30°C +85°C 60 x 43 x 85 mm - DIN Rail Series 16
RS-stocknr. 913-9731
FabrikantnummerMETSECT5CC005
€ 29,82
Each
Aantal stuks
50:5 21mm Toroidal Ring - - - - - -25°C +60°C 65 x 44 x 30 mm - DIN Rail -
RS-stocknr. 287-3131
FabrikantnummerCT151M40/5-2.5/3
FabrikantHOBUT
€ 15,48
Each
Aantal stuks
40:5 14mm Straight Through 75mm 54.5mm 68mm - - -20°C +70°C - - - -
RS-stocknr. 914-5275
FabrikantnummerCT160-5-H7
FabrikantHOBUT
€ 24,09
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
€ 4,19
Each
Aantal stuks
- - - - - - 100A - -40°C +85°C 34.9 x 34.9 x 14.3 mm - - -
RS-stocknr. 173-0064
FabrikantnummerACX-1050
FabrikantNuvotem Talema
€ 3,507
Each (In a Box of 240)
Aantal stuks
- - - - - - 50A - -40°C +85°C 23.8 x 23.8 x 11.12 mm - - -
RS-stocknr. 668-4067
FabrikantnummerCT105F250/5-2.5/1
FabrikantHOBUT
€ 44,12
Each
Aantal stuks
250:5 21mm Base Mounted 79mm 105mm 53mm - - -30°C +80°C - - - -
RS-stocknr. 351-099
FabrikantnummerMI5
FabrikantCarlo Gavazzi
€ 35,48
Each
Aantal stuks
- - - 45mm 52mm 16mm 0.5 → 5A - -20°C +60°C - - - -
RS-stocknr. 751-1620
Fabrikantnummer93484 P1
FabrikantNuvotem Talema
€ 13,56
Each
Aantal stuks
- - - - - - 200A - -20°C +70°C 62 (Dia.) x 20 mm - Stand Alone -
RS-stocknr. 173-0181
FabrikantRS PRO
€ 2,939
Each (In a Box of 351)
Aantal stuks
- - - - - - 1 → 10A - -40°C +120°C 17.2 x 9.53 x 20.4 mm - PCB Mount -
RS-stocknr. 537-4542
FabrikantnummerAC-1050
FabrikantNuvotem Talema
€ 3,61
Each
Aantal stuks
- - - - - - 50A - -40°C +120°C 34.9 x 14.3 x 34.9 mm - PCB Mount -
RS-stocknr. 914-5301
FabrikantnummerCTSCMWH500/0.333V
FabrikantHOBUT
€ 40,72
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Aantal stuks
- 35mm Split Core - - - 500A 333 mV -15°C +50°C 51.2 x 51.2 x 83.5 mm Multi Function Meter Cable -
RS-stocknr. 897-6930
Fabrikantnummer4 121 52
FabrikantLegrand
€ 254,01
Each
Aantal stuks
2500:5 - Base Mounted - - - - - -25°C +50°C 160 x 125 x 40 mm Ammeter, Electricity Meter, Measurement Control Unit Surface Mount -
RS-stocknr. 173-0215
FabrikantRS PRO
€ 1,762
Each (In a Box of 351)
Aantal stuks
- - - - - - 5A - -40°C +120°C 17.2 x 9.53 x 20.4 mm - PCB Mount -
RS-stocknr. 124-3882
FabrikantRS PRO
€ 3,58
Each
Aantal stuks
- - - - - - 1 → 10A - -40°C +120°C 17.2 x 9.53 x 20.4 mm - PCB Mount -
RS-stocknr. 124-3898
FabrikantRS PRO
€ 1,96
Each
Aantal stuks
- - - - - - 5A - -40°C +120°C 17.2 x 9.53 x 20.4 mm - PCB Mount -
RS-stocknr. 173-0061
FabrikantnummerAC-1100
FabrikantNuvotem Talema
€ 4,788
Each (In a Box of 27)
Aantal stuks
- - - - - - 100A - -40°C +120°C 44.5 x 14.3 x 44.5 mm - Through Hole -
RS-stocknr. 106-8537
Fabrikantnummer56T100C
€ 1,352
Each (In a Tube of 25)
Aantal stuks
- - - - - - 10A - -40°C +85°C 16.79 x 8.89 x 20.19 mm - Through Hole -
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