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. 532-9227
Mfr. Part No.HTFS 400-P
BrandLEM
HK$192.31
Each
units
600:1 22mm - 46mm Open Loop 40mm 5 V 600A 17mm - -40°C +105°C - -
RS Stock No. 775-4928
Mfr. Part No.AX-1000
HK$30.77
Each
units
10:1 - - - - - - 10A - - -40°C +120°C 12.7 x 17 x 9.53 mm -
RS Stock No. 886-2162
Mfr. Part No.XM19-285111S000000
HK$217.82
Each
units
300:5 50mm Base Mounted - - - - - - - - - 86 x 45 x 110 mm -
RS Stock No. 446-0412
Mfr. Part No.AK 5 C420L
BrandLEM
HK$2,667.69
Each
units
5:1 19mm - 55.4mm - 88.9mm 24 V dc, 150 V ac 5A 23.7mm 4 → 20 mA -20°C +50°C - -
RS Stock No. 668-4051
Mfr. Part No.CT105F100/5-2.5/1
BrandHOBUT
HK$349.75
Each
units
100:5 21mm Base Mounted 79mm - 105mm - - 53mm - -30°C +80°C - -
RS Stock No. 871-1613
Mfr. Part No.B82801B0205A100
BrandEPCOS
HK$13.70
Each (In a Bag of 3)
units
20:1 - - - - - - 20A - - -40°C +125°C 8.13 x 7.11 x 5.08 mm -
RS Stock No. 331-480
Mfr. Part No.CTSCM40600/5-5/1
BrandHOBUT
HK$432.88
Each
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600:5 - Clip Fit 104.5mm - 116mm - 600A 35.5mm 5 A -30°C +80°C - -
RS Stock No. 667-3459
Mfr. Part No.CSNE151-104
BrandHoneywell
HK$157.79
Each
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56:1 - - 20.3mm Closed Loop 31.75mm 15 V dc 56A 12.7mm 12.5 mA -40°C +75°C - -
RS Stock No. 793-4584
Mfr. Part No.HLSR 10-P
BrandLEM
HK$104.77
Each
units
25:1 - - 12mm Open Loop 17.2mm 4.5 → 5.5 V 25A 21mm 10 A -40°C +105°C - -
RS Stock No. 477-4711
Mfr. Part No.CSNS300M
BrandHoneywell
HK$870.63
Each
units
600:1 26mm - 61.2mm Closed Loop 67.5mm 15 V 600A 19mm 150 mA -40°C +85°C - -
RS Stock No. 173-0057
Mfr. Part No.AX-1000
HK$27.545
Each (In a Box of 250)
units
10:1 - - - - - - 10A - - -40°C +120°C 12.7 x 17 x 9.53 mm -
RS Stock No. 611-8602
Mfr. Part No.K8ACCT200L
BrandOmron
HK$621.76
1 Box of 1
Box(es)
- 30mm Toroidal Ring 81.5mm - 76mm - - 20mm - - - - -
RS Stock No. 913-9738
Mfr. Part No.METSECT5CC020
HK$482.76
Each
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200:5 21mm Toroidal Ring - - - - - - - -25°C +60°C 65 x 44 x 30 mm -
RS Stock No. 532-9198
Mfr. Part No.HAIS 50-P
BrandLEM
HK$195.72
Each
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150:1 15 x 8mm - 29.5mm Open Loop 33mm 5 V 150A 14mm - -40°C +85°C - -
RS Stock No. 173-0061
Mfr. Part No.AC-1100
HK$50.034
Each (In a Box of 27)
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100:1 - - - - - - 100A - - -40°C +120°C 44.5 x 14.3 x 44.5 mm -
RS Stock No. 331-547
Mfr. Part No.CT164M400/5-5/1-001
BrandHOBUT
HK$195.52
Each
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400:5 28mm DIN Rail Mounted 78mm - 60mm - 400A 45mm 5 A -30°C +85°C - -
RS Stock No. 881-7941
Mfr. Part No.CTPROXT50SELV
BrandABB
HK$231.66
Each
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- 18mm - - - - - - - - -5°C +50°C 45 x 96 x 69 mm -
RS Stock No. 313-817
Mfr. Part No.CT174M600/5-2.5/1-001
BrandHOBUT
HK$157.59
Each
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600:5 - Base Mounted 95mm - 70mm - - 55mm - -30°C +85°C - -
RS Stock No. 745-7995
Mfr. Part No.TRA2400001
BrandCarel
HK$97.47
Each
units
- - - - - - - - - - -10°C +50°C - 12/24Vac controllers
RS Stock No. 446-0585
Mfr. Part No.AKR 200 B420L
BrandLEM
HK$3,170.78
Each
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200:1 21.7mm - 57.2mm - 89.7mm 24 V dc, 150 V ac 200A 30mm 4 → 20 mA -20°C +50°C - -
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