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. 400-8575
Mfr. Part No.AS-100
MYR17.30
Each
units
- - - - - - 15A - -40°C +120°C 17.2 x 20.4 x 9.53 mm - PCB Mount -
RS Stock No. 381-0793
Mfr. Part No.CT196M800/5-5/1
BrandHOBUT
MYR119.40
Each
units
800:5 45mm Base Mounted 126mm 90mm 60mm - - -30°C +85°C - - - -
RS Stock No. 331-367
Mfr. Part No.CT164M600/5-5/0.5-001
BrandHOBUT
MYR98.32
Each
units
600:5 28mm Base Mounted 78mm 60mm 45mm - - -30°C +85°C - - - -
RS Stock No. 715-7055
Mfr. Part No.54100C
MYR10.27
Each
units
- - - - - - 15A - -40°C +125°C 10.8 x 9 x 8.2 mm - Surface Mount -
RS Stock No. 173-0066
Mfr. Part No.AZ-0500
MYR25.663
Each (In a Box of 84)
units
- - - - - - 25A - -40°C +85°C 19.0 x 11.5 x 21.5 mm - Flying Lead -
RS Stock No. 124-3880
BrandRS PRO
MYR7.00
Each
units
- - - - - - 15A - -40°C +120°C 17.2 x 9.53 x 20.4 mm - PCB Mount -
RS Stock No. 331-581
Mfr. Part No.CTSCM40300/5-2.5/1
BrandHOBUT
MYR242.53
Each
units
300:5 - Clip Fit 116mm 104.5mm 35.5mm - - -30°C +80°C - - - -
RS Stock No. 777-7170
Mfr. Part No.17H7NNJN3
BrandGIC
MYR342.46
Each
units
- 92mm Base Mounted, DIN Rail Mounted 132mm 20mm 155mm - - -15°C 60°C - - - -
RS Stock No. 287-3169
Mfr. Part No.CT151M80/5-2.5/1
BrandHOBUT
MYR77.44
Each
units
80:5 14mm Straight Through 75mm 54.5mm 68mm - - -20°C +70°C - - - -
RS Stock No. 250-0142
Mfr. Part No.TRA12UN100
BrandCarel
MYR54.60
Each
units
- - - 47mm 58mm 33mm - - - - - 12/24Vac controllers Surface Mount -
RS Stock No. 287-3175
Mfr. Part No.CT153M120/5-2.5/1
BrandHOBUT
MYR82.31
Each
units
120:5 26mm Straight Through 75mm 54.5mm 68mm - - -20°C +70°C - - - -
RS Stock No. 537-4508
Mfr. Part No.AC-1015
MYR18.09
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. 173-0056
Mfr. Part No.AP-1000
MYR18.918
Each (In a Box of 250)
units
- - - - - - 10A - -40°C +85°C 17.2 x 9.53 x 20.4 mm - - -
RS Stock No. 886-2203
Mfr. Part No.XM20-375141S000000
MYR107.91
Each
units
800:5 60mm Base Mounted - - - - - - - 86 x 45 x 110 mm - Surface Mount Omega XMER
RS Stock No. 881-7957
Mfr. Part No.CTPROXT100SELV
BrandABB
MYR116.59
Each
units
- 18mm - - - - - - -5°C +50°C 45 x 96 x 69 mm - BusBar, DIN Rail CT PRO XT SELV
RS Stock No. 775-4943
Mfr. Part No.AP-1000
MYR21.14
Each
units
- - - - - - 10A - -40°C +85°C 17.2 x 9.53 x 20.4 mm - - -
RS Stock No. 106-8816
Mfr. Part No.53100C
MYR3.529
Each (On a Reel of 1000)
units
- - - - - - 10A - -40°C +125°C 8.3 x 7.2 x 5.4 mm - Surface Mount -
RS Stock No. 123-6739
Mfr. Part No.XS03-375105S 000000
MYR326.78
Each
units
800:5 120 x 80mm Clip Fit - - - - - - - 155 x 40 x 198 mm - Surface Mount Omega10
RS Stock No. 914-5262
Mfr. Part No.CT160-5-F7
BrandHOBUT
MYR94.27
Each
units
- - - - - - - - -30°C +85°C 60 x 43 x 85 mm - DIN Rail Series 16
RS Stock No. 715-7074
Mfr. Part No.56300C
MYR6.63
Each
units
- - - - - - 10A - -40°C +85°C 16.79 x 8.89 x 20.19 mm - Through Hole -