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 Input Current Overall Depth Output Current Minimum Temperature Maximum Temperature Dimensions For Use With Mounting Type Series
RS Stock No. 171-8855
BrandRS PRO
MYR92.92
Each
units
5:5 62 x 40mm Clip Fit 78mm 62mm 5A 40mm 5 A -5°C +55°C 62 x 40 x 78 mm - Surface Mount -
RS Stock No. 171-8851
BrandRS PRO
MYR227.15
Each
units
400:5 33 x 23mm Base Mounted 106mm 93mm 400A 40mm 5 A +20°C +70°C 93 x 40 x 106 mm - Surface Mount -
RS Stock No. 171-8770
BrandRS PRO
MYR77.58
Each
units
200:1 30 x 10mm - 70mm 50mm - 30mm - - - 50 x 30 x 70 mm - - -
RS Stock No. 171-8759
BrandRS PRO
MYR86.98
Each
units
200:1 21 x 10mm - 65mm 45mm - 40mm - - - 45 x 40 x 65 mm - - -
RS Stock No. 171-8778
BrandRS PRO
MYR63.76
Each
units
500:5 30 x 10mm Clip Fit 70mm 50mm 500A 31mm 5 A -5°C +55°C 50 x 31 x 70 mm - Surface Mount -
RS Stock No. 418-3604
Mfr. Part No.CTSCEN100<400/5
BrandHOBUT
MYR349.77
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
MYR18.09
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.90AS
BrandEfergy
MYR61.63
Each
units
- 12mm Split Core - - - - - - - - Data Loggers/DAS, Digital or Analog Meters, DMMs, Recorders - -
RS Stock No. 914-5301
Mfr. Part No.CTSCMWH500/0.333V
BrandHOBUT
MYR207.91
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. 914-5294
Mfr. Part No.CTSCMWH60/0.333V
BrandHOBUT
MYR66.96
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. 397-9117
Mfr. Part No.BZCT035
MYR185.50
Each
units
- 35mm - 74mm 64mm - 40mm - -20°C +60°C - Broyce Type A Earth Leakage Relays Surface Mount BZCT
RS Stock No. 123-6725
Mfr. Part No.XN45-315051S000000
MYR152.15
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
MYR424.50
Each
units
1000:5, 200:5, 400:5, 600:5, 800:5 - Clip Fit 125mm 132mm - 38mm - -30°C +80°C - - - -
RS Stock No. 775-2705
Mfr. Part No.CTSCMICRO19-150/5-T-S
BrandHOBUT
MYR255.54
Each
units
- - - 78mm 58mm - 49mm - -30°C 55°C - - - -
RS Stock No. 775-2701
Mfr. Part No.CTSCMICRO19-100/5-T-S
BrandHOBUT
MYR213.99
Each
units
- - - 78mm 58mm - 49mm - -30°C 55°C - - - -
RS Stock No. 399-7244
Mfr. Part No.ASM-010
MYR19.56
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
MYR83.78
Each
units
- - - - - 250A - - -20°C +70°C 62 (Dia.) x 20 mm - Stand Alone -
RS Stock No. 537-4520
Mfr. Part No.AC-1020
MYR18.09
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. 913-9731
Mfr. Part No.METSECT5CC005
MYR253.47
Each
units
50:5 21mm Toroidal Ring - - - - - -25°C +60°C 65 x 44 x 30 mm - DIN Rail -
RS Stock No. 331-604
Mfr. Part No.CTSCM40400/5-5/1
BrandHOBUT
MYR242.53
Each
units
400:5 - Clip Fit 116mm 104.5mm - 35.5mm - -30°C +80°C - - - -
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