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. 668-4067
Mfr. Part No.CT105F250/5-2.5/1
BrandHOBUT
HK$380.77
Each
units
250:5 21mm Base Mounted 79mm 105mm 53mm - - -30°C +80°C - - - -
RS Stock No. 331-339
Mfr. Part No.CT132M100/5-2.5/1
BrandHOBUT
HK$148.47
Each
units
100:5 21mm DIN Rail Mounted 65mm 45mm 30mm - - -30°C +85°C - - - -
RS Stock No. 913-9734
Mfr. Part No.METSECT5CC013
HK$326.15
Each
units
125:5 21mm Tropicalise - - - - - -25°C +60°C 65 x 44 x 30 mm - DIN Rail -
RS Stock No. 537-4485
Mfr. Part No.AC-1005
HK$22.494
Each (In a Pack of 5)
units
- - - - - - 5A - -40°C +120°C 23.8 x 23.8 x 11.12 mm - PCB Mount -
RS Stock No. 533-0621
Mfr. Part No.CTSCEN200<1000/5
BrandHOBUT
HK$704.81
Each
units
200:5, 400:5, 600:5, 800:5, 1000:5 - Clip Fit 125mm 132mm 38mm - - -30°C +80°C - - - -
RS Stock No. 819-9779
Mfr. Part No.Mini CT Sensor
BrandEfergy
HK$100.80
Each
units
- 12mm Split Core - - - - - - - - Data Loggers/DAS, Digital or Analog Meters, DMMs, Recorders - -
RS Stock No. 173-0064
Mfr. Part No.ACX-1050
HK$29.969
Each (In a Box of 240)
units
- - - - - - 50A - -40°C +85°C 23.8 x 23.8 x 11.12 mm - - -
RS Stock No. 775-4934
Mfr. Part No.ACX-1050
HK$20.47
Each
units
- - - - - - 50A - -40°C +85°C 23.8 x 23.8 x 11.12 mm - - -
RS Stock No. 331-519
Mfr. Part No.CT143M100/5-2.5/1-001
BrandHOBUT
HK$128.89
Each
units
100:5 24mm DIN Rail Mounted 70mm 49mm 45mm - - -30°C +85°C - - - -
RS Stock No. 668-4055
Mfr. Part No.CT105F150/5-2.5/1
BrandHOBUT
HK$329.56
Each
units
150:5 21mm Base Mounted 79mm 105mm 53mm - - -30°C +80°C - - - -
RS Stock No. 668-4064
Mfr. Part No.CT105F200/5-2.5/1
BrandHOBUT
HK$381.48
Each
units
200:5 21mm Base Mounted 79mm 105mm 53mm - - -30°C +80°C - - - -
RS Stock No. 914-5294
Mfr. Part No.CTSCMWH60/0.333V
BrandHOBUT
HK$146.78
Each
units
- 10mm Split Core - - - 60A 333 mV -15°C +50°C 28.7 x 26.4 x 41.7 mm Multi Function Meter Cable -
RS Stock No. 331-581
Mfr. Part No.CTSCM40300/5-2.5/1
BrandHOBUT
HK$301.93
Each
units
300:5 - Clip Fit 116mm 104.5mm 35.5mm - - -30°C +80°C - - - -
RS Stock No. 913-9731
Mfr. Part No.METSECT5CC005
HK$369.21
Each
units
50:5 21mm Tropicalise - - - - - -25°C +60°C 65 x 44 x 30 mm - DIN Rail -
RS Stock No. 173-0058
Mfr. Part No.AP-1500
HK$26.822
Each (In a Box of 250)
units
- - - - - - 10A - -40°C +85°C 17.2 x 9.53 x 20.4 mm - - -
RS Stock No. 533-0643
Mfr. Part No.CTSCM40-200/5
BrandHOBUT
HK$383.35
Each
units
200:5 - Clip Fit 104.5mm 116mm 35.5mm - - -30°C +80°C - - - -
RS Stock No. 418-3604
Mfr. Part No.CTSCEN100<400/5
BrandHOBUT
HK$690.49
Each
units
100:5, 200:5, 300:5, 400:5 - Clip Fit 113mm 127mm 40mm - - -30°C +80°C - - - -
RS Stock No. 775-4915
Mfr. Part No.AX-0500
HK$18.23
Each
units
- - - - - - 5A - -40°C +120°C 12.7 x 17 x 9.53 mm - Through Hole -
RS Stock No. 914-5301
Mfr. Part No.CTSCMWH500/0.333V
BrandHOBUT
HK$275.20
Each
units
- 35mm Split Core - - - 500A 333 mV -15°C +50°C 51.2 x 51.2 x 83.5 mm Multi Function Meter Cable -
RS Stock No. 331-575
Mfr. Part No.CTSCM40500/5-5/1
BrandHOBUT
HK$383.02
Each
units
500:5 - Clip Fit 116mm 104.5mm 35.5mm - - -30°C +80°C - - - -
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