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. 123-6730
FabrikantnummerXS01-225221S 000000
FabrikantSifam Tinsley
€ 38,79
Each
Aantal stuks
150:5 33 x 23mm Clip Fit - - - - - - - 93 x 40 x 106 mm - Surface Mount Omega10
RS-stocknr. 812-9601
FabrikantnummerCMCT200-1/1
€ 104,40
Each
Aantal stuks
- - - - - - 200A - - - 149 (Dia) x 56 mm - Surface Mount -
RS-stocknr. 914-5304
FabrikantnummerCTSCMWH120/0.333V
FabrikantHOBUT
€ 25,45
Each
Aantal stuks
- 16mm Split Core - - - 120A 333 mV -15°C +50°C 29.9 x 31 x 53 mm Multi Function Meter Cable -
RS-stocknr. 729-5517
FabrikantnummerAC-1100
FabrikantNuvotem Talema
€ 5,31
Each
Aantal stuks
- - - - - - 100A - -40°C +120°C 44.5 x 14.3 x 44.5 mm - Through Hole -
RS-stocknr. 832-9851
FabrikantnummerL01-8002
FabrikantAlttec
€ 12,45
Each
Aantal stuks
100:1 21.5mm Clip Fit 65mm 45mm 30mm - - - +40°C 65 x 45 x 67 mm - - -
RS-stocknr. 715-7077
Fabrikantnummer56T100C
€ 1,38
Each
Aantal stuks
- - - - - - 10A - -40°C +85°C 16.79 x 8.89 x 20.19 mm - Through Hole -
RS-stocknr. 914-5294
FabrikantnummerCTSCMWH60/0.333V
FabrikantHOBUT
€ 21,71
Each
Aantal stuks
- 10mm Split Core - - - 60A 333 mV -15°C +50°C 28.7 x 26.4 x 41.7 mm Multi Function Meter Cable -
RS-stocknr. 611-8602
FabrikantnummerK8ACCT200L
FabrikantOmron
€ 68,30
1 Box of 1
Box(es)
- 30mm Toroidal Ring 81.5mm 76mm 20mm - - - - - - - -
RS-stocknr. 751-1617
Fabrikantnummer93482 P1
FabrikantNuvotem Talema
€ 16,69
Each
Aantal stuks
- - - - - - 100A - -20°C +70°C 70 (Dia.) x 36 mm - Stand Alone -
RS-stocknr. 828-5209
FabrikantnummerBZCT050
FabrikantBroyce Control
€ 45,88
Each
Aantal stuks
- 50mm - - - - - - -20°C +60°C - Broyce Type A Earth Leakage Relays Surface Mount BZCT
RS-stocknr. 124-3883
FabrikantRS PRO
€ 5,58
Each
Aantal stuks
- - - - - - 5 → 50A - -40°C +120°C 32 x 20.5 x 35 mm - PCB Mount -
RS-stocknr. 124-3895
FabrikantRS PRO
€ 9,42
Each
Aantal stuks
- - - - - - 200 → 500A - -55°C +130°C 55.6 x 20.6 x 55.6 mm - PCB Mount -
RS-stocknr. 751-1627
Fabrikantnummer93486 P1
FabrikantNuvotem Talema
€ 13,96
Each
Aantal stuks
- - - - - - 300A - -20°C +70°C 62 (Dia.) x 20 mm - Stand Alone -
RS-stocknr. 167-0135
FabrikantnummerB82801B0205A100
FabrikantEPCOS
€ 0,873
Each (On a Reel of 900)
Aantal stuks
- - - - - - 20A - -40°C +125°C 8.13 x 7.11 x 5.08 mm - Surface Mount -
RS-stocknr. 331-446
FabrikantnummerCT164M800/5-5/0.5-001
FabrikantHOBUT
€ 24,61
Each
Aantal stuks
800:5 28mm DIN Rail Mounted 78mm 60mm 45mm - - -30°C +85°C - - - -
RS-stocknr. 124-3896
FabrikantRS PRO
€ 3,36
Each
Aantal stuks
- - - - - - 25A - -40°C +85°C 19 x 11.5 x 21.5 mm - - -
RS-stocknr. 123-6713
FabrikantnummerXN25-205031S000000
FabrikantSifam Tinsley
€ 35,68
Each
Aantal stuks
125:5 31mm Base Mounted - - - 125A 5 A - - 75 x 60 x 87.5 mm MCCB BusBar, DIN Rail, Plug In Omega
RS-stocknr. 775-4928
FabrikantnummerAX-1000
FabrikantNuvotem Talema
€ 2,96
Each
Aantal stuks
- - - - - - 10A - -40°C +120°C 12.7 x 17 x 9.53 mm - Through Hole -
RS-stocknr. 173-0056
FabrikantnummerAP-1000
FabrikantNuvotem Talema
€ 3,12
Each (In a Box of 250)
Aantal stuks
- - - - - - 10A - -40°C +85°C 17.2 x 9.53 x 20.4 mm - - -
RS-stocknr. 832-9876
FabrikantnummerL01-8007
FabrikantAlttec
€ 12,45
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200:5 21.5mm Clip Fit 65mm 45mm 30mm - - - +40°C 65 x 45 x 67 mm - - -
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