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 Bore Size Transformer Type Overall Height Sensor Technology Overall Width Supply Voltage Input Current Overall Depth Output Current Minimum Temperature Maximum Temperature Dimensions For Use With
RS Stock No. 162-0292
Mfr. Part No.B82801B0803A020
BrandEPCOS
TWD43.90
Each (On a Reel of 900)
units
20:1 - - - - - - 20A - - -40°C +125°C 8.13 x 7.11 x 5.08 mm -
RS Stock No. 833-2879
Mfr. Part No.2CCA880124R0001
BrandABB
TWD2,669.00
Each
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80:1 10mm - 31.8mm - 45.5mm 690 V ac, 1500 V dc 80A 45.5mm - -25°C +70°C - -
RS Stock No. 198-4482
Mfr. Part No.METSECT5DD100
TWD3,690.00
Each
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1000:5 - Tropicalise 116mm - 96mm - 1000A 78.4mm 5 A -25°C +50°C - -
New
RS Stock No. 200-3804
Mfr. Part No.LES 15-NP
BrandLEM
TWD371.00
Each
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15:1 - - - Closed Loop - +5 V 15A - - - - - -
RS Stock No. 446-0620
Mfr. Part No.DK 200 B420
BrandLEM
TWD15,516.00
Each
units
200:1 21.7mm - 68.6mm Open Loop 89.7mm 20 → 50 V dc 200A 30.2mm 4 → 20 mA -20°C +50°C - -
RS Stock No. 287-3131
Mfr. Part No.CT151M40/5-2.5/3
BrandHOBUT
TWD535.00
Each
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40:5 14mm Straight Through 75mm - 54.5mm - - 68mm - -20°C +70°C - -
RS Stock No. 138-3476
Mfr. Part No.HO 150-S/SP30-0100
BrandLEM
TWD618.00
Each
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375:1 15 x 8mm - 30.82mm Open Loop 45mm 4.5 → 5.5 V 375A 40.8mm 19 → 25 mA -40°C +105°C - -
RS Stock No. 775-4934
Mfr. Part No.ACX-1050
TWD161.00
Each
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50:1 - - - - - - 50A - - -40°C +85°C 23.8 x 23.8 x 11.12 mm -
RS Stock No. 171-8850
BrandRS PRO
TWD1,467.00
Each
units
300:5 33 x 23mm Base Mounted 106mm - 93mm - 300A 40mm 5 A +20°C +70°C 93 x 40 x 106 mm -
RS Stock No. 123-6730
Mfr. Part No.XS01-225221S 000000
TWD1,307.00
Each
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150:5 33 x 23mm Clip Fit - - - - - - - - - 93 x 40 x 106 mm -
RS Stock No. 198-4491
Mfr. Part No.METSECT5DH200
TWD4,575.00
Each
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2000:5 - Tropicalise 129mm - 98mm - 2000A 40mm 5 A -25°C +50°C - -
RS Stock No. 171-8804
BrandRS PRO
TWD954.00
Each
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1000:5 41 x 41mm Clip Fit 98mm - 74mm - 1000A 45mm 5 A -5°C +55°C 74 x 45 x 98 mm -
RS Stock No. 886-2156
Mfr. Part No.XM13-335111S000000
TWD528.00
Each
units
600:5 40mm Base Mounted - - - - - - - - - 62 x 40 x 78 mm -
RS Stock No. 171-8759
BrandRS PRO
TWD587.00
Each
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200:1 21 x 10mm - 65mm - 45mm - - 40mm - - - 45 x 40 x 65 mm -
RS Stock No. 435-8741
Mfr. Part No.HX 05-NP
BrandLEM
TWD447.00
Each
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30:1 0.8mm - 20mm Open Loop 19mm 15 V 30A 15.4mm - -25°C +85°C - -
RS Stock No. 138-3480
Mfr. Part No.HO 200-S/SP30-0100
BrandLEM
TWD618.00
Each
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500:1 15 x 8mm - 30.82mm Open Loop 45mm 4.5 → 5.5 V 500A 40.8mm 19 → 25 mA -40°C +105°C - -
RS Stock No. 171-8771
BrandRS PRO
TWD347.00
Each
units
200:5 30 x 10mm Clip Fit 70mm - 50mm - 200A 31mm 5 A -5°C +55°C 50 x 31 x 70 mm -
RS Stock No. 833-2743
Mfr. Part No.DM0T0050
BrandLovato
TWD647.00
Each
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50:5 22mm Base Mounted 66mm - 44mm - - 32mm - -25°C +50°C - -
RS Stock No. 775-4943
Mfr. Part No.AP-1000
TWD141.00
Each
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10:1 - - - - - - 10A - - -40°C +85°C 17.2 x 9.53 x 20.4 mm -
New
RS Stock No. 200-3810
Mfr. Part No.LESR 6-NP KIT 3P
BrandLEM
TWD673.00
Each
units
6:1 - - - Closed Loop - +5 V 6A - - - - - -