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. 881-7935
Mfr. Part No.CTPROXT300
BrandABB
$32.14
Each
units
- 18mm - - - - - - -5°C +50°C 45 x 96 x 69 mm - BusBar, DIN Rail CT PRO XT
RS Stock No. 881-7972
Mfr. Part No.CTMAX400
BrandABB
$45.01
Each
units
- 30mm - - - - - - -5°C +50°C 70 x 111 x 69 mm - BusBar, DIN Rail CT MAX
RS Stock No. 881-7966
Mfr. Part No.CTPROXT300SELV
BrandABB
$36.63
Each
units
- 18mm - - - - - - -5°C +50°C 45 x 96 x 69 mm - BusBar, DIN Rail CT PRO XT SELV
RS Stock No. 881-7904
Mfr. Part No.CTPROXT50
BrandABB
$28.44
Each
units
- 18mm - - - - - - -5°C +50°C 45 x 96 x 69 mm - BusBar, DIN Rail CT PRO XT
RS Stock No. 881-7900
Mfr. Part No.CTPROXT40
BrandABB
$28.07
Each
units
- 18mm - - - - - - -5°C +50°C 45 x 96 x 69 mm - BusBar, DIN Rail CT PRO XT
RS Stock No. 881-7932
Mfr. Part No.CTPROXT40SELV
BrandABB
$33.48
Each
units
- 18mm - - - - - - -5°C +50°C 45 x 96 x 69 mm - BusBar, DIN Rail CT PRO XT SELV
RS Stock No. 881-7957
Mfr. Part No.CTPROXT100SELV
BrandABB
$38.56
Each
units
- 18mm - - - - - - -5°C +50°C 45 x 96 x 69 mm - BusBar, DIN Rail CT PRO XT SELV
RS Stock No. 881-7994
Mfr. Part No.CTMAX400SELV
BrandABB
$49.44
Each
units
- 30mm - - - - - - -5°C +50°C 70 x 111 x 69 mm - BusBar, DIN Rail CT MAX SELV
RS Stock No. 881-7950
Mfr. Part No.CTPROXT150SELV
BrandABB
$36.63
Each
units
- 18mm - - - - - - -5°C +50°C 45 x 96 x 69 mm - BusBar, DIN Rail CT PRO XT SELV
RS Stock No. 881-7944
Mfr. Part No.2CSG225865R1101
BrandABB
$33.15
Each
units
- 18mm - - - - - - -5°C +50°C 45 x 96 x 69 mm - BusBar, DIN Rail CT PRO XT SELV
RS Stock No. 881-7913
Mfr. Part No.CTPROXT60
BrandABB
$24.60
Each
units
- 18mm - - - - - - -5°C +50°C 45 x 96 x 69 mm - BusBar, DIN Rail CT PRO XT
RS Stock No. 881-7998
Mfr. Part No.CTMAX500SELV
BrandABB
$48.25
Each
units
- 30mm - - - - - - -5°C +50°C 70 x 111 x 69 mm - BusBar, DIN Rail CT MAX SELV
RS Stock No. 881-8001
Mfr. Part No.2CSG226035R1101
BrandABB
$52.03
Each
units
- 30mm - - - - - - -5°C +50°C 70 x 111 x 69 mm - BusBar, DIN Rail CT MAX SELV
RS Stock No. 881-7938
Mfr. Part No.CTPROXT400
BrandABB
$38.56
Each
units
- 18mm - - - - - - -5°C +50°C 45 x 96 x 69 mm - BusBar, DIN Rail CT PRO XT
RS Stock No. 881-7948
Mfr. Part No.CTPROXT80SELV
BrandABB
$33.15
Each
units
- 18mm - - - - - - -5°C +50°C 45 x 96 x 69 mm - BusBar, DIN Rail CT PRO XT SELV
RS Stock No. 881-7916
Mfr. Part No.CTPROXT80
BrandABB
$24.60
Each
units
- 18mm - - - - - - -5°C +50°C 45 x 96 x 69 mm - BusBar, DIN Rail CT PRO XT
RS Stock No. 881-8008
Mfr. Part No.CTMAX1000SELV
BrandABB
$52.04
Each
units
- 30mm - - - - - - -5°C +50°C 70 x 111 x 69 mm - BusBar, DIN Rail CT MAX SELV
RS Stock No. 881-7988
Mfr. Part No.CTMAX800
BrandABB
$41.23
Each
units
- 30mm - - - - - - -5°C +50°C 70 x 111 x 69 mm - BusBar, DIN Rail CT MAX
RS Stock No. 881-7922
Mfr. Part No.CTPROXT200
BrandABB
$32.14
Each
units
- 18mm - - - - - - -5°C +50°C 45 x 96 x 69 mm - BusBar, DIN Rail CT PRO XT
RS Stock No. 881-7976
Mfr. Part No.CTMAX500
BrandABB
$43.40
Each
units
- 30mm - - - - - - -5°C +50°C 70 x 111 x 69 mm - BusBar, DIN Rail CT MAX