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. 173-0066
Mfr. Part No.AZ-0500
kr 41,969
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. 171-8859
BrandRS PRO
kr 186,64
Each
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30:5 62 x 40mm Clip Fit 78mm 62mm 40mm 30A 5 A -5°C +55°C 62 x 40 x 78 mm - Surface Mount -
RS Stock No. 886-2128
Mfr. Part No.XM02-195071S000000
kr 115,36
Each
Units
120:5 21mm Base Mounted - - - - - - - 45 x 40 x 65 mm - Surface Mount Omega XMER
RS Stock No. 775-4947
Mfr. Part No.AP-1500
kr 25,32
Each
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- - - - - - 10A - -40°C +85°C 17.2 x 9.53 x 20.4 mm - - -
RS Stock No. 175-6142
Mfr. Part No.4NC5121-2CC21
BrandSiemens
kr 643,07
Each
Units
150:5 - Window 65.6mm 60mm 75.3mm 150A 5 A -30°C +55°C 60 x 75.3 x 65.6 mm Sentron Power Monitoring Devices Chassis Mount Sentron
RS Stock No. 171-8749
BrandRS PRO
kr 173,08
Each
Units
50:1 21 x 10mm - 65mm 45mm 40mm - - - - 45 x 40 x 65 mm - - -
RS Stock No. 886-2229
Mfr. Part No.XM24-395135S000000
kr 333,09
Each
Units
1000:5 100mm Base Mounted - - - - - - - 140 x 45 x 155 mm - Surface Mount Omega XMER
RS Stock No. 171-8783
BrandRS PRO
kr 188,23
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150:5 30 x 11mm Clip Fit 78mm 62mm 40mm 150A 5 A -5°C +55°C 62 x 40 x 78 mm - Surface Mount -
RS Stock No. 122-0471
Mfr. Part No.192T3240
BrandSocomec
kr 288,53
Each
Units
- 26mm - - - - - - - - 75.5 x 61 x 48 mm - DIN Rail TCB 26-40
RS Stock No. 175-6189
Mfr. Part No.4NC5327-2DE21
BrandSiemens
kr 740,07
Each
Units
600:5 - Window 84.1mm 82.5mm 98mm 600A 5 A -30°C +55°C 82.5 x 98 x 84.1 mm Sentron Power Monitoring Devices Chassis Mount Sentron
RS Stock No. 917-6531
Mfr. Part No.LT6CT2001
kr 746,33
Each
Units
- - - - - - - - - - 107 x 95 x 25 mm - - -
RS Stock No. 173-0064
Mfr. Part No.ACX-1050
kr 25,355
Each (In a Box of 240)
Units
- - - - - - 50A - -40°C +85°C 23.8 x 23.8 x 11.12 mm - - -
RS Stock No. 886-2222
Mfr. Part No.XM20-435141S000000
kr 268,81
Each
Units
1600:5 60mm Base Mounted - - - - - - - 86 x 45 x 110 mm - Surface Mount Omega XMER
RS Stock No. 123-6735
Mfr. Part No.XS02-315055S 000000
kr 436,36
Each
Units
400:5 80 x 50mm Clip Fit - - - - - - - 125 x 40 x 158 mm - Surface Mount Omega10
RS Stock No. 175-6184
Mfr. Part No.4NC5326-2CE21
BrandSiemens
kr 752,74
Each
Units
500:5 - Window 84.1mm 82.5mm 98mm 500A 5 A -30°C +55°C 82.5 x 98 x 84.1 mm Sentron Power Monitoring Devices Chassis Mount Sentron
RS Stock No. 351-910
Mfr. Part No.MI100
kr 494,79
Each
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- - - 67.5mm 95mm 20mm 10 → 100A - -20°C +60°C - - - -
RS Stock No. 170-9249
Mfr. Part No.53125C
kr 6,195
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. 124-3887
BrandRS PRO
kr 26,92
Each
Units
- - - - - - 20 60A - -55°C +130°C 23.8 x 11.12 x 23.8 mm - PCB Mount -
RS Stock No. 886-2203
Mfr. Part No.XM20-375141S000000
kr 261,59
Each
Units
800:5 60mm Base Mounted - - - - - - - 86 x 45 x 110 mm - Surface Mount Omega XMER
RS Stock No. 886-2168
Mfr. Part No.XM13-375111S000000
kr 152,00
Each
Units
800:5 40mm Base Mounted - - - - - - - 62 x 40 x 78 mm - Surface Mount Omega XMER
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