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. 106-8534
Mfr. Part No.56050C
R 28.891
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. 881-7910
Mfr. Part No.CTPROXT100
BrandABB
R 484.49
Each
units
- 18mm - - - - - - -5°C +50°C 45 x 96 x 69 mm - BusBar, DIN Rail CT PRO XT
RS stock no. 715-7068
Mfr. Part No.56050C
R 32.83
Each
units
- - - - - - 10A - -40°C +85°C 16.79 x 8.89 x 20.19 mm - Through Hole -
RS stock no. 775-2701
Mfr. Part No.CTSCMICRO19-100/5-T-S
BrandHOBUT
R 938.64
Each
units
- - - 78mm 58mm 49mm - - -30°C 55°C - - - -
RS stock no. 812-9601
Mfr. Part No.CMCT200-1/1
R 3,237.53
Each
units
- - - - - - 200A - - - 149 (Dia) x 56 mm - Surface Mount -
RS stock no. 418-3604
Mfr. Part No.CTSCEN100<400/5
BrandHOBUT
R 1,598.64
Each
units
100:5, 200:5, 300:5, 400:5 - Clip Fit 113mm 127mm 40mm - - -30°C +80°C - - - -
RS stock no. 886-2118
Mfr. Part No.XM02-135031S000000
R 259.78
Each
units
50:5 21mm Base Mounted - - - - - - - 45 x 40 x 65 mm - Surface Mount Omega XMER
RS stock no. 331-597
Mfr. Part No.CT132M40/5-1/3
BrandHOBUT
R 352.40
Each
units
40:5 21mm DIN Rail Mounted 65mm 45mm 30mm - - -30°C +85°C - - - -
RS stock no. 392-8311
Mfr. Part No.ASK 412.4 100/5 A
R 629.17
Each
units
100:5 30.5mm Base Mounted 88.5mm 70mm 58mm - - -5°C +40°C - - - -
RS stock no. 537-4491
Mfr. Part No.AC-1010
R 65.772
Each (In a Pack of 5)
units
- - - - - - 10A - -40°C +120°C 23.8 x 23.8 x 11.12 mm - PCB Mount -
RS stock no. 173-0061
Mfr. Part No.AC-1100
R 115.922
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. 729-5517
Mfr. Part No.AC-1100
R 126.41
Each
units
- - - - - - 100A - -40°C +120°C 44.5 x 14.3 x 44.5 mm - Through Hole -
RS stock no. 441-4920
Mfr. Part No.BZCT120
R 1,963.73
Each
units
- 120mm - 170mm 155mm 40mm - - -20°C +60°C - Broyce Type A Earth Leakage Relays Surface Mount BZCT
RS stock no. 392-8333
Mfr. Part No.ASK 412.4 50/5 A
R 660.27
Each
units
50:5 30.5mm Base Mounted 88.5mm 70mm 58mm - - -5°C +40°C - - - -
RS stock no. 881-7957
Mfr. Part No.CTPROXT100SELV
BrandABB
R 576.32
Each
units
- 18mm - - - - - - -5°C +50°C 45 x 96 x 69 mm - BusBar, DIN Rail CT PRO XT SELV
RS stock no. 173-0070
Mfr. Part No.AX-0500
R 50.297
Each (In a Box of 250)
units
- - - - - - 5A - -40°C +120°C 12.7 x 17 x 9.53 mm - Through Hole -
RS stock no. 729-5514
Mfr. Part No.AC-1075
R 98.87
Each
units
- - - - - - 75A - -40°C +120°C 38.1 x 15.9 x 38.1 mm - Through Hole -
RS stock no. 124-3897
BrandRS PRO
R 75.53
Each
units
- - - - - - 50A - -40°C +85°C 19 x 11.5 x 21.5 mm - PCB Mount -
RS stock no. 775-4915
Mfr. Part No.AX-0500
R 59.27
Each
units
- - - - - - 5A - -40°C +120°C 12.7 x 17 x 9.53 mm - Through Hole -
RS stock no. 173-0069
Mfr. Part No.AC-1075
R 90.332
Each (In a Box of 60)
units
- - - - - - 75A - -40°C +120°C 38.1 x 15.9 x 38.1 mm - Through Hole -