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. 418-3604
Mfr. Part No.CTSCEN100<400/5
BrandHOBUT
MYR323.18
Each
units
100:5, 200:5, 300:5, 400:5 - Clip Fit 113mm 127mm 40mm - - -30°C +80°C - - - -
RS Stock No. 537-4485
Mfr. Part No.AC-1005
MYR13.856
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. 819-9779
Mfr. Part No.Mini CT Sensor
BrandEfergy
MYR53.80
Each
units
- 12mm Split Core - - - - - - - - Data Loggers/DAS, Digital or Analog Meters, DMMs, Recorders - -
RS Stock No. 914-5294
Mfr. Part No.CTSCMWH60/0.333V
BrandHOBUT
MYR69.06
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. 914-5301
Mfr. Part No.CTSCMWH500/0.333V
BrandHOBUT
MYR136.32
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. 123-6725
Mfr. Part No.XN45-315051S000000
MYR113.60
Each
units
400:5 31mm Base Mounted - - - 400A 5 A - - 141 x 38 x 102.5 mm MCCB BusBar, DIN Rail, Plug In Omega
RS Stock No. 533-0621
Mfr. Part No.CTSCEN200<1000/5
BrandHOBUT
MYR335.11
Each
units
200:5, 400:5, 600:5, 800:5, 1000:5 - Clip Fit 125mm 132mm 38mm - - -30°C +80°C - - - -
RS Stock No. 397-9117
Mfr. Part No.BZCT035
MYR161.06
Each
units
- 35mm - 74mm 64mm 40mm - - -20°C +60°C - Broyce Type A Earth Leakage Relays Surface Mount BZCT
RS Stock No. 775-2705
Mfr. Part No.CTSCMICRO19-150/5-T-S
BrandHOBUT
MYR198.12
Each
units
- - - 78mm 58mm 49mm - - -30°C 55°C - - - -
RS Stock No. 775-2701
Mfr. Part No.CTSCMICRO19-100/5-T-S
BrandHOBUT
MYR215.83
Each
units
- - - 78mm 58mm 49mm - - -30°C 55°C - - - -
RS Stock No. 832-9845
Mfr. Part No.L01-8510
BrandAlttec
MYR93.22
Each
units
250:5 28mm Clip Fit 78.5mm 61mm 40mm - - - +40°C 78.5 x 61 x 72 mm - - -
RS Stock No. 537-4520
Mfr. Part No.AC-1020
MYR11.998
Each (In a Pack of 5)
units
- - - - - - 20A - -40°C +120°C 23.8 x 23.8 x 11.12 mm - PCB Mount -
RS Stock No. 399-7244
Mfr. Part No.ASM-010
MYR9.32
Each
units
- - - - - - 10A - -40°C +120°C 20.4 x 17.2 x 9.53 mm - PCB Mount -
RS Stock No. 751-1623
Mfr. Part No.93485 P1
MYR57.33
Each
units
- - - - - - 250A - -20°C +70°C 62 (Dia.) x 20 mm - Stand Alone -
RS Stock No. 331-604
Mfr. Part No.CTSCM40400/5-5/1
BrandHOBUT
MYR165.00
Each
units
400:5 - Clip Fit 116mm 104.5mm 35.5mm - - -30°C +80°C - - - -
RS Stock No. 913-9731
Mfr. Part No.METSECT5CC005
MYR223.48
Each
units
50:5 21mm Tropicalise - - - - - -25°C +60°C 65 x 44 x 30 mm - DIN Rail -
RS Stock No. 832-9841
Mfr. Part No.L01-8508
BrandAlttec
MYR91.39
Each
units
150:5 28mm Clip Fit 78.5mm 61mm 40mm - - - +40°C 78.5 x 61 x 72 mm - - -
RS Stock No. 751-1633
Mfr. Part No.93489 P1
MYR121.33
Each
units
- - - - - - 600A - -20°C +70°C 80 (Dia.) x 20 mm - Stand Alone -
RS Stock No. 331-597
Mfr. Part No.CT132M40/5-1/3
BrandHOBUT
MYR54.85
Each
units
40:5 21mm DIN Rail Mounted 65mm 45mm 30mm - - -30°C +85°C - - - -
RS Stock No. 331-474
Mfr. Part No.CT132M50/5-1/1
BrandHOBUT
MYR62.18
Each
units
50:5 21mm DIN Rail Mounted 65mm 45mm 30mm - - -30°C +85°C - - - -
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