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. 886-2171
FabrikantnummerXM19-315131S000000
FabrikantSifam Tinsley
24,58 €
Each
Aantal stuks
400:5 50mm Base Mounted - - - - - - - 86 x 45 x 110 mm - Surface Mount Omega XMER
RS-stocknr. 283-6384
Fabrikantnummer26852304
FabrikantCrouzet
57,43 €
Each
Aantal stuks
- 13mm - 39mm 38mm 20mm - - - - - - - -
RS-stocknr. 399-7250
FabrikantnummerASM-050
FabrikantNuvotem Talema
4,61 €
Each
Aantal stuks
- - - - - - 50A - -40°C +120°C 35 x 32 x 20.5 mm - PCB Mount -
RS-stocknr. 881-8008
FabrikantnummerCTMAX1000SELV
FabrikantABB
52,65 €
Each
Aantal stuks
- 30mm - - - - - - -5°C +50°C 70 x 111 x 69 mm - BusBar, DIN Rail CT MAX SELV
RS-stocknr. 173-0235
FabrikantRS PRO
3,474 €
Each (In a Box of 351)
Aantal stuks
- - - - - - 10A - -40°C +120°C 17.2 x 9.53 x 20.4 mm - PCB Mount -
RS-stocknr. 775-4959
FabrikantnummerAP-2500
FabrikantNuvotem Talema
3,85 €
Each
Aantal stuks
- - - - - - 15A - -40°C +85°C 17.2 x 9.53 x 20.4 mm - - -
RS-stocknr. 331-604
FabrikantnummerCTSCM40400/5-5/1
FabrikantHOBUT
47,51 €
Each
Aantal stuks
400:5 - Clip Fit 116mm 104.5mm 35.5mm - - -30°C +80°C - - - -
RS-stocknr. 399-7339
FabrikantnummerAS-104
FabrikantNuvotem Talema
1,80 €
Each
Aantal stuks
- - - - - - 15A - -40°C +120°C 17.2 x 20.4 x 9.53 mm - PCB Mount -
RS-stocknr. 886-2162
FabrikantnummerXM19-285111S000000
FabrikantSifam Tinsley
24,58 €
Each
Aantal stuks
300:5 50mm Base Mounted - - - - - - - 86 x 45 x 110 mm - Surface Mount Omega XMER
RS-stocknr. 715-7055
Fabrikantnummer54100C
2,15 €
Each
Aantal stuks
- - - - - - 15A - -40°C +125°C 10.8 x 9 x 8.2 mm - Surface Mount -
RS-stocknr. 745-7995
FabrikantnummerTRA2400001
FabrikantCarel
10,44 €
Each
Aantal stuks
- - - - - - - - -10°C +50°C - 24 Vac Controllers Surface Mount -
RS-stocknr. 124-2471
FabrikantnummerP01379608
286,77 €
1 Set
Set(s)
600:1 36mm Split Core - - - 600A 1 A -20°C +50°C 57.1 x 40.2 x 91.4 mm ENERIUM Power Monitors, ULYS Submeters Plug In TC CLIP
RS-stocknr. 729-5520
FabrikantnummerAC-1200
FabrikantNuvotem Talema
7,73 €
Each
Aantal stuks
- - - - - - 200A - -40°C +120°C 55.6 x 20.6 x 55.6 mm - Through Hole -
RS-stocknr. 914-5290
FabrikantnummerCTSCMWH30/0.333V
FabrikantHOBUT
21,71 €
Each
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. 881-7966
FabrikantnummerCTPROXT300SELV
FabrikantABB
42,30 €
Each
Aantal stuks
- 18mm - - - - - - -5°C +50°C 45 x 96 x 69 mm - BusBar, DIN Rail CT PRO XT SELV
RS-stocknr. 533-0637
FabrikantnummerCTSCM40-100/5
FabrikantHOBUT
47,51 €
Each
Aantal stuks
100:5 - Clip Fit 104.5mm 116mm 35.5mm - - -30°C +80°C - - - -
RS-stocknr. 914-5301
FabrikantnummerCTSCMWH500/0.333V
FabrikantHOBUT
40,72 €
Each
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. 106-8529
Fabrikantnummer54100C
1,235 €
Each (On a Reel of 450)
Aantal stuks
- - - - - - 15A - -40°C +125°C 10.8 x 9 x 8.2 mm - Surface Mount -
RS-stocknr. 173-0060
FabrikantnummerAC-1200
FabrikantNuvotem Talema
6,965 €
Each (In a Box of 27)
Aantal stuks
- - - - - - 200A - -40°C +120°C 55.6 x 20.6 x 55.6 mm - Through Hole -
RS-stocknr. 124-3900
FabrikantRS PRO
3,64 €
Each
Aantal stuks
- - - - - - 10A - -40°C +120°C 17.2 x 9.53 x 20.4 mm - PCB Mount -
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