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. 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. 715-7024
Mfr. Part No.53030C
HK$14.76
Each
units
- - - - - - 10A - -40°C +125°C 8.3 x 7.2 x 5.4 mm - Surface Mount -
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. 106-8534
Mfr. Part No.56050C
HK$13.25
Each (In a Tube of 25)
units
- - - - - - 10A - -40°C +85°C 16.79 x 8.89 x 20.19 mm - Through Hole -
RS Stock No. 170-9247
Mfr. Part No.53030C
HK$7.223
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. 510-9152
Mfr. Part No.7KT1201
BrandSiemens
HK$1,849.39
Each
units
- 13mm Straight Through - - - - - - - - - DIN Rail -
RS Stock No. 886-2099
Mfr. Part No.XW01-045081S000000
HK$170.00
Each
units
5:5 - Base Mounted - - - - - - - 62 x 40 x 78 mm - Surface Mount Omega XMER
RS Stock No. 287-3197
Mfr. Part No.CT153M200/5-2.5/1
BrandHOBUT
HK$161.88
Each
units
200:5 26mm Universal Mounted 75mm 54.5mm 68mm - - -20°C +70°C - - - -
RS Stock No. 287-3226
Mfr. Part No.CT153M400/5-2.5/1
BrandHOBUT
HK$206.04
Each
units
400:5 26mm Universal Mounted 75mm 54.5mm 68mm - - -20°C +70°C - - - -
RS Stock No. 257-830
Mfr. Part No.CT173M400/5-2.5/1-002
BrandHOBUT
HK$205.81
Each
units
400:5 40mm Base Mounted 95mm 70mm 55mm - - -30°C +85°C - - - -
RS Stock No. 313-823
Mfr. Part No.CT174M800/5-2.5/1-001
BrandHOBUT
HK$241.50
Each
units
800:5 40mm Base Mounted 95mm 70mm 55mm - - -30°C +85°C - - - -
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. 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. 881-7941
Mfr. Part No.CTPROXT50SELV
BrandABB
HK$231.66
Each
units
- 18mm - - - - - - -5°C +50°C 45 x 96 x 69 mm - BusBar, DIN Rail CT PRO XT SELV
RS Stock No. 775-2701
Mfr. Part No.CTSCMICRO19-100/5-T-S
BrandHOBUT
HK$425.00
Each
units
- - - 78mm 58mm 49mm - - -30°C 55°C - - - -
RS Stock No. 287-3232
Mfr. Part No.CT153M500/5-2.5/1
BrandHOBUT
HK$197.34
Each
units
500:5 26mm Universal Mounted 75mm 54.5mm 68mm - - -20°C +70°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. 331-373
Mfr. Part No.CT164M500/5-5/0.5-001
BrandHOBUT
HK$206.38
Each
units
500:5 28mm DIN Rail Mounted 78mm 60mm 45mm - - -30°C +85°C - - - -
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 - Surface Mount Omega XMER
RS Stock No. 106-8532
Mfr. Part No.56100C
HK$13.25
Each (In a Tube of 25)
units
- - - - - - 10A - -40°C +85°C 16.79 x 8.89 x 20.19 mm - Through Hole -
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