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. 173-0068
Mfr. Part No.AZ-1000
kr 45,055
Each (In a Box of 84)
Units
- - - - - - 50A - -40°C +85°C 19.0 x 11.5 x 21.5 mm - Flying Lead -
RS Stock No. 173-0161
Mfr. Part No.AP-2500
kr 16,343
Each (In a Box of 250)
Units
- - - - - - 15A - -40°C +85°C 17.2 x 9.53 x 20.4 mm - - -
RS Stock No. 123-9539
Mfr. Part No.7KT1200
BrandSiemens
kr 885,34
Each
Units
60:5 13mm Straight Through - - - 60A 5 A - - 105 x 71 x 90 mm - Panel Mount 7KT12
RS Stock No. 886-2102
Mfr. Part No.XW01-075081S000000
kr 181,09
Each
Units
15:5 - Base Mounted - - - - - - - 62 x 40 x 78 mm - Surface Mount Omega XMER
RS Stock No. 537-4520
Mfr. Part No.AC-1020
kr 36,908
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. 331-547
Mfr. Part No.CT164M400/5-5/1-001
BrandHOBUT
kr 221,63
Each
Units
400:5 28mm DIN Rail Mounted 78mm 60mm 45mm - - -30°C +85°C - - - -
RS Stock No. 537-4508
Mfr. Part No.AC-1015
kr 24,128
Each (In a Pack of 5)
Units
- - - - - - 15A - -40°C +120°C 23.8 x 23.8 x 11.12 mm - PCB Mount -
RS Stock No. 775-4959
Mfr. Part No.AP-2500
kr 16,69
Each
Units
- - - - - - 15A - -40°C +85°C 17.2 x 9.53 x 20.4 mm - - -
RS Stock No. 775-4912
Mfr. Part No.AZ-1000
kr 47,76
Each
Units
- - - - - - 50A - -40°C +85°C 19.0 x 11.5 x 21.5 mm - Flying Lead -
RS Stock No. 399-7317
Mfr. Part No.AS-103
kr 13,96
Each
Units
- - - - - - 15A - -40°C +120°C 17.2 x 20.4 x 9.53 mm - PCB Mount -
RS Stock No. 331-418
Mfr. Part No.CT143M60/5-1.5/1-001
BrandHOBUT
kr 154,04
Each
Units
60:5 24mm DIN Rail Mounted 70mm 49mm 45mm - - -30°C +85°C - - - -
RS Stock No. 881-7963
Mfr. Part No.CTPROXT250SELV
BrandABB
kr 379,56
Each
Units
- 18mm - - - - - - -5°C +50°C 45 x 96 x 69 mm - BusBar, DIN Rail CT PRO XT SELV
RS Stock No. 124-3895
BrandRS PRO
kr 93,92
Each
Units
- - - - - - 200 → 500A - -55°C +130°C 55.6 x 20.6 x 55.6 mm - PCB Mount -
RS Stock No. 124-3889
BrandRS PRO
kr 14,21
Each
Units
- - - - - - 30 → 75A - -55°C +130°C 30.2 x 14.3 x 30.2 mm - PCB Mount -
RS Stock No. 819-9798
Mfr. Part No.140AS
BrandEfergy
kr 136,20
Each
Units
- 19mm - - - - - - - - - Oscilloscopes - -
RS Stock No. 833-2746
Mfr. Part No.DM0T080
BrandLovato
kr 199,76
Each
Units
80:5 22mm Base Mounted 66mm 32mm 44mm - - -25°C +50°C - - - -
RS Stock No. 745-7995
Mfr. Part No.TRA2400001
BrandCarel
kr 104,11
Each
Units
- - - - - - - - -10°C +50°C - 24 Vac Controllers Surface Mount -
RS Stock No. 331-519
Mfr. Part No.CT143M100/5-2.5/1-001
BrandHOBUT
kr 157,23
Each
Units
100:5 24mm DIN Rail Mounted 70mm 49mm 45mm - - -30°C +85°C - - - -
RS Stock No. 331-395
Mfr. Part No.CT164M300/5-2.5/1-001
BrandHOBUT
kr 208,07
Each
Units
300:5 28mm DIN Rail Mounted 78mm 60mm 45mm - - -30°C +85°C - - - -
RS Stock No. 886-2124
Mfr. Part No.XM02-185071S000000
kr 115,36
Each
Units
100:5 21mm Base Mounted - - - - - - - 45 x 40 x 65 mm - Surface Mount Omega XMER
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