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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RS Stock No. 124-3897
Brand :RS PRO
THB123.14
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- - - - - - 50A - -40°C +85°C 19 x 11.5 x 21.5 mm - PCB Mount -
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Brand :RS PRO
THB663.687
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THB65.07
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RS Stock No. 124-3885
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THB343.04
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RS Stock No. 124-3900
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THB72.90
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- - - - - - 10A - -40°C +120°C 17.2 x 9.53 x 20.4 mm - PCB Mount -
RS Stock No. 173-0201
Brand :RS PRO
THB791.316
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- - - - - - 60 → 200A - -55°C +130°C 38.1 x 15.9 x 38.1 mm - PCB Mount -
RS Stock No. 173-0041
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THB45.10
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- - - - - - 15A - -40°C +120°C 17.2 x 9.53 x 20.4 mm - PCB Mount -
RS Stock No. 173-0220
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THB883.029
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- - - - - - 25A - -40°C +85°C 19 x 11.5 x 21.5 mm - - -
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THB40.75
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- - - - - - 15A - -40°C +120°C 17.2 x 9.53 x 20.4 mm - PCB Mount -
RS Stock No. 124-3892
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THB99.26
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- - - - - - 60 → 200A - -55°C +130°C 38.1 x 15.9 x 38.1 mm - PCB Mount -
RS Stock No. 124-3893
Brand :RS PRO
THB99.26
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- - - - - - 75 → 200A - -55°C +130°C 38.1 x 15.9 x 38.1 mm - PCB Mount -
RS Stock No. 173-0235
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THB1,217.704
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- - - - - - 10A - -40°C +120°C 17.2 x 9.53 x 20.4 mm - PCB Mount -
RS Stock No. 124-3896
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THB115.30
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- - - - - - 25A - -40°C +85°C 19 x 11.5 x 21.5 mm - - -
RS Stock No. 173-0182
Brand :RS PRO
THB663.686
Each (In a Box of 220)
Units
- - - - - - 10 → 60A - -55°C +130°C 23.8 x 11.12 x 23.8 mm - PCB Mount -
RS Stock No. 173-0217
Brand :RS PRO
THB883.026
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- - - - - - 75 → 200A - -55°C +130°C 38.1 x 15.9 x 38.1 mm - PCB Mount -
RS Stock No. 171-8761
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THB462.14
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250:5 21 x 10mm Clip Fit 65mm 45mm 40mm 250A 5 A -5°C +55°C 45 x 40 x 65 mm - Surface Mount -
RS Stock No. 171-8766
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THB422.41
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125:5 30 x 10mm Clip Fit 70mm 50mm 31mm 125A 5 A -5°C +55°C 50 x 31 x 70 mm - Surface Mount -
RS Stock No. 171-8836
Brand :RS PRO
THB3,089.23
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1500:5 38 x 128mm Base Mounted 170mm 99mm 45mm 1.5kA 5 A -5°C +55°C 99 x 45 x 170 mm - Surface Mount -
RS Stock No. 171-8813
Brand :RS PRO
THB1,005.91
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1200:5 80 x 12mm Clip Fit 126mm 104mm 45mm 1.2kA 5 A -5°C +55°C 104 x 45 x 126 mm - Surface Mount -
RS Stock No. 171-8754
Brand :RS PRO
THB757.08
Each
Units
100:1 21 x 10mm - 65mm 45mm 40mm - - - - 45 x 40 x 65 mm - - -
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