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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Description Price 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 Stock No. 729-5520
Mfr. Part No.AC-1200
kr 48,65
Each
Units
- - - - - - 200A - -40°C +120°C 55.6 x 20.6 x 55.6 mm - Through Hole -
RS Stock No. 173-0060
Mfr. Part No.AC-1200
kr 43,731
Each (In a Box of 27)
Units
- - - - - - 200A - -40°C +120°C 55.6 x 20.6 x 55.6 mm - Through Hole -
RS Stock No. 331-452
Mfr. Part No.CT132M200/5-2.5/0.5
BrandHOBUT
kr 135,69
Each
Units
200:5 21mm DIN Rail Mounted 65mm 45mm 30mm - - -30°C +85°C - - - -
RS Stock No. 331-424
Mfr. Part No.CT132M250/5-2.5/0.5
BrandHOBUT
kr 142,80
Each
Units
250:5 21mm DIN Rail Mounted 65mm 45mm 30mm - - -30°C +85°C - - - -
RS Stock No. 886-2109
Mfr. Part No.XW01-065081S000000
kr 181,09
Each
Units
10:5 - Base Mounted - - - - - - - 62 x 40 x 78 mm - Surface Mount Omega XMER
RS Stock No. 857-7432
Mfr. Part No.E83-2050
kr 3 517,56
Each
Units
100 A:30 mA 12mm Base Mounted 56mm 22.5mm 47.4mm - - -20°C +50°C 56 x 22.5 x 47.4 mm - - -
RS Stock No. 914-5290
Mfr. Part No.CTSCMWH30/0.333V
BrandHOBUT
kr 189,03
Each
Units
- 10mm Split Core - - - 30A 333 mV -15°C +50°C 28.7 x 26.4 x 41.7 mm Multi Function Meter Cable -
RS Stock No. 668-4051
Mfr. Part No.CT105F100/5-2.5/1
BrandHOBUT
kr 365,26
Each
Units
100:5 21mm Base Mounted 79mm 105mm 53mm - - -30°C +80°C - - - -
RS Stock No. 331-581
Mfr. Part No.CTSCM40300/5-2.5/1
BrandHOBUT
kr 478,24
Each
Units
300:5 - Clip Fit 116mm 104.5mm 35.5mm - - -30°C +80°C - - - -
RS Stock No. 775-4959
Mfr. Part No.AP-2500
kr 16,69
Each
Units
- - - - - - 15A - -40°C +85°C 17.2 x 9.53 x 20.4 mm - - -
RS Stock No. 819-9779
Mfr. Part No.90AS
BrandEfergy
kr 107,52
Each
Units
- 12mm Split Core - - - - - - - - Data Loggers/DAS, Digital or Analog Meters, DMMs, Recorders - -
RS Stock No. 775-4912
Mfr. Part No.AZ-1000
kr 47,76
Each
Units
- - - - - - 50A - -40°C +85°C 19.0 x 11.5 x 21.5 mm - Flying Lead -
RS Stock No. 123-9539
Mfr. Part No.7KT1200
BrandSiemens
kr 885,34
Each
Units
60:5 13mm Straight Through - - - 60A 5 A - - 105 x 71 x 90 mm - Panel Mount 7KT12
RS Stock No. 331-597
Mfr. Part No.CT132M40/5-1/3
BrandHOBUT
kr 146,41
Each
Units
40:5 21mm DIN Rail Mounted 65mm 45mm 30mm - - -30°C +85°C - - - -
RS Stock No. 173-0067
Mfr. Part No.AZ-0750
kr 44,444
Each (In a Box of 84)
Units
- - - - - - 40A - -40°C +85°C 19.0 x 11.5 x 21.5 mm - Flying Lead -
RS Stock No. 173-0161
Mfr. Part No.AP-2500
kr 16,343
Each (In a Box of 250)
Units
- - - - - - 15A - -40°C +85°C 17.2 x 9.53 x 20.4 mm - - -
RS Stock No. 537-4508
Mfr. Part No.AC-1015
kr 24,128
Each (In a Pack of 5)
Units
- - - - - - 15A - -40°C +120°C 23.8 x 23.8 x 11.12 mm - PCB Mount -
RS Stock No. 886-2102
Mfr. Part No.XW01-075081S000000
kr 181,09
Each
Units
15:5 - Base Mounted - - - - - - - 62 x 40 x 78 mm - Surface Mount Omega XMER
RS Stock No. 537-4520
Mfr. Part No.AC-1020
kr 36,908
Each (In a Pack of 5)
Units
- - - - - - 20A - -40°C +120°C 23.8 x 23.8 x 11.12 mm - PCB Mount -
RS Stock No. 331-446
Mfr. Part No.CT164M800/5-5/0.5-001
BrandHOBUT
kr 257,02
Each
Units
800:5 28mm DIN Rail Mounted 78mm 60mm 45mm - - -30°C +85°C - - - -
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