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. 914-5301
FabrikantnummerCTSCMWH500/0.333V
FabrikantHOBUT
€ 39,65
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. 914-5294
FabrikantnummerCTSCMWH60/0.333V
FabrikantHOBUT
€ 21,15
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. 751-1620
Fabrikantnummer93484 P1
FabrikantNuvotem Talema
€ 20,27
Each
Aantal stuks
- - - - - - 200A - -20°C +70°C 62 (Dia.) x 20 mm - Stand Alone -
RS-stocknr. 914-5304
FabrikantnummerCTSCMWH120/0.333V
FabrikantHOBUT
€ 24,78
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. 124-3882
FabrikantRS PRO
€ 1,89
Each
Aantal stuks
- - - - - - 1 → 10A - -40°C +120°C 17.2 x 9.53 x 20.4 mm - PCB Mount -
RS-stocknr. 775-4925
FabrikantnummerAN3-1000
FabrikantNuvotem Talema
€ 23,64
Each
Aantal stuks
- - - - - - 100A - -30°C +90°C 131 x 50.5 x 16 mm - Lead -
RS-stocknr. 812-9601
FabrikantnummerCMCT200-1/1
€ 104,40
Each
Aantal stuks
- - - - - - 200A - - - 149 (Dia) x 56 mm - Surface Mount -
RS-stocknr. 897-6930
Fabrikantnummer4 121 52
FabrikantLegrand
€ 246,61
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. 173-0181
FabrikantRS PRO
€ 1,708
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. 124-3896
FabrikantRS PRO
€ 3,36
Each
Aantal stuks
- - - - - - 25A - -40°C +85°C 19 x 11.5 x 21.5 mm - - -
RS-stocknr. 124-3897
FabrikantRS PRO
€ 3,59
Each
Aantal stuks
- - - - - - 50A - -40°C +85°C 19 x 11.5 x 21.5 mm - PCB Mount -
RS-stocknr. 886-2193
FabrikantnummerXM19-405151S000000
FabrikantSifam Tinsley
€ 25,75
Each
Aantal stuks
1200:5 50mm Base Mounted - - - - - - - 86 x 45 x 110 mm - Surface Mount Omega XMER
RS-stocknr. 828-5209
FabrikantnummerBZCT050
FabrikantBroyce Control
€ 46,12
Each
Aantal stuks
- 50mm - - - - - - -20°C +60°C - Broyce Type A Earth Leakage Relays Surface Mount BZCT
RS-stocknr. 399-7250
FabrikantnummerASM-050
FabrikantNuvotem Talema
€ 3,08
Each
Aantal stuks
- - - - - - 50A - -40°C +120°C 35 x 32 x 20.5 mm - PCB Mount -
RS-stocknr. 777-7176
Fabrikantnummer17H7NNIN3
FabrikantGIC
€ 35,35
Each
Aantal stuks
- 57mm Solid Core 97mm 20mm 107mm - - -15°C +60°C - - - -
RS-stocknr. 351-106
FabrikantnummerMI20
FabrikantCarlo Gavazzi
€ 36,92
Each
Aantal stuks
- - - 45mm 52mm 16mm 2 → 20A - -20°C +60°C - - - -
RS-stocknr. 173-0219
FabrikantRS PRO
€ 4,994
Each (In a Box of 18)
Aantal stuks
- - - - - - 200 → 500A - -55°C +130°C 55.6 x 20.6 x 55.6 mm - PCB Mount -
RS-stocknr. 257-830
FabrikantnummerCT173M400/5-2.5/1-002
FabrikantHOBUT
€ 16,05
Each
Aantal stuks
400:5 40mm Base Mounted 95mm 70mm 55mm - - -30°C +85°C - - - -
RS-stocknr. 775-4928
FabrikantnummerAX-1000
FabrikantNuvotem Talema
€ 2,63
Each
Aantal stuks
- - - - - - 10A - -40°C +120°C 12.7 x 17 x 9.53 mm - Through Hole -
RS-stocknr. 913-9734
FabrikantnummerMETSECT5CC013
€ 37,38
Each
Aantal stuks
125:5 21mm Tropicalise - - - - - -25°C +60°C 65 x 44 x 30 mm - DIN Rail -
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