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. 715-7061
Mfr. Part No.56100C
HK$13.81
Each
units
- - - - - - 10A - -40°C +85°C 16.79 x 8.89 x 20.19 mm - Through Hole -
RS Stock No. 331-553
Mfr. Part No.CT143M200/5-2.5/1-001
BrandHOBUT
HK$160.39
Each
units
200:5 24mm DIN Rail Mounted 70mm 49mm 45mm - - -30°C +85°C - - - -
RS Stock No. 886-2102
Mfr. Part No.XW01-075081S000000
HK$170.00
Each
units
15:5 - Base Mounted - - - - - - - 62 x 40 x 78 mm - Surface Mount Omega XMER
RS Stock No. 331-480
Mfr. Part No.CTSCM40600/5-5/1
BrandHOBUT
HK$379.01
Each
units
600:5 - Clip Fit 104.5mm 116mm 35.5mm - - -30°C +80°C - - - -
RS Stock No. 715-7055
Mfr. Part No.54100C
HK$21.48
Each
units
- - - - - - 15A - -40°C +125°C 10.8 x 9 x 8.2 mm - Surface Mount -
RS Stock No. 287-3197
Mfr. Part No.CT153M200/5-2.5/1
BrandHOBUT
HK$161.88
Each
units
200:5 26mm Straight Through 75mm 54.5mm 68mm - - -20°C +70°C - - - -
RS Stock No. 775-4928
Mfr. Part No.AX-1000
HK$30.77
Each
units
- - - - - - 10A - -40°C +120°C 12.7 x 17 x 9.53 mm - Through Hole -
RS Stock No. 287-3232
Mfr. Part No.CT153M500/5-2.5/1
BrandHOBUT
HK$197.34
Each
units
500:5 26mm Straight Through 75mm 54.5mm 68mm - - -20°C +70°C - - - -
RS Stock No. 167-0135
Mfr. Part No.B82801B0205A100
BrandEPCOS
HK$11.532
Each (On a Reel of 900)
units
- - - - - - 20A - -40°C +125°C 8.13 x 7.11 x 5.08 mm - Surface Mount -
RS Stock No. 510-9152
Mfr. Part No.7KT1201
BrandSiemens
HK$1,849.39
Each
units
- 13mm Straight Through - - - - - - - - - DIN Rail -
RS Stock No. 287-3210
Mfr. Part No.CT153M300/5-2.5/1
BrandHOBUT
HK$171.26
Each
units
300:5 26mm Straight Through 75mm 54.5mm 68mm - - -20°C +70°C - - - -
RS Stock No. 751-1614
Mfr. Part No.93481 P1
HK$241.61
Each
units
- - - - - - 60A - -20°C +70°C 70 (Dia.) x 36 mm - Stand Alone -
RS Stock No. 313-801
Mfr. Part No.CT174M500/5-2.5/1-001
BrandHOBUT
HK$95.52
Each
units
500:5 40mm Base Mounted 95mm 70mm 55mm - - -30°C +85°C - - - -
RS Stock No. 871-1613
Mfr. Part No.B82801B0205A100
BrandEPCOS
HK$10.55
Each (In a Bag of 3)
units
- - - - - - 20A - -40°C +125°C 8.13 x 7.11 x 5.08 mm - Surface Mount -
RS Stock No. 313-817
Mfr. Part No.CT174M600/5-2.5/1-001
BrandHOBUT
HK$222.28
Each
units
600:5 40mm Base Mounted 95mm 70mm 55mm - - -30°C +85°C - - - -
RS Stock No. 832-9863
Mfr. Part No.L01-8004
BrandAlttec
HK$119.09
Each
units
150:1 21.5mm Clip Fit 65mm 45mm 30mm - - - +40°C 65 x 45 x 67 mm - - -
RS Stock No. 775-2714
Mfr. Part No.CTSCMICRO19-200/5-T-S
BrandHOBUT
HK$425.00
Each
units
200:5 - Split Core 78mm 58mm 49mm - - -30°C +55°C - - - -
RS Stock No. 106-8529
Mfr. Part No.54100C
HK$12.074
Each (On a Reel of 450)
units
- - - - - - 15A - -40°C +125°C 10.8 x 9 x 8.2 mm - Surface Mount -
RS Stock No. 173-0061
Mfr. Part No.AC-1100
HK$49.798
Each (In a Box of 27)
units
- - - - - - 100A - -40°C +120°C 44.5 x 14.3 x 44.5 mm - Through Hole -
RS Stock No. 715-7068
Mfr. Part No.56050C
HK$13.63
Each
units
- - - - - - 10A - -40°C +85°C 16.79 x 8.89 x 20.19 mm - Through Hole -
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