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. 173-0181
Brand :RS PRO
THB115.977
Each (In a Box of 351)
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- - - - - 1 → 10A - - -40°C +120°C 17.2 x 9.53 x 20.4 mm - PCB Mount -
RS Stock No. 124-3882
Brand :RS PRO
THB67.80
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- - - - - 1 → 10A - - -40°C +120°C 17.2 x 9.53 x 20.4 mm - PCB Mount -
RS Stock No. 124-3897
Brand :RS PRO
THB143.75
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Brand :RS PRO
THB39.416
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- - - - - 15A - - -40°C +120°C 17.2 x 9.53 x 20.4 mm - PCB Mount -
RS Stock No. 173-0217
Brand :RS PRO
THB186.44
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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
Brand :RS PRO
THB137.088
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Units
- - - - - 10A - - -40°C +120°C 17.2 x 9.53 x 20.4 mm - PCB Mount -
RS Stock No. 124-3896
Brand :RS PRO
THB134.59
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- - - - - 25A - - -40°C +85°C 19 x 11.5 x 21.5 mm - - -
RS Stock No. 124-3879
Brand :RS PRO
THB48.07
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RS Stock No. 124-3893
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THB205.09
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RS Stock No. 124-3892
Brand :RS PRO
THB110.33
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- - - - - 60 → 200A - - -55°C +130°C 38.1 x 15.9 x 38.1 mm - PCB Mount -
RS Stock No. 173-0220
Brand :RS PRO
THB121.133
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Units
- - - - - 25A - - -40°C +85°C 19 x 11.5 x 21.5 mm - - -
RS Stock No. 124-3900
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THB154.55
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RS Stock No. 173-0201
Brand :RS PRO
THB99.298
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- - - - - 60 → 200A - - -55°C +130°C 38.1 x 15.9 x 38.1 mm - PCB Mount -
RS Stock No. 171-8758
Brand :RS PRO
THB432.16
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150:5 21 x 10mm Clip Fit 65mm 45mm 150A 40mm 5 A -5°C +55°C 45 x 40 x 65 mm - Surface Mount -
RS Stock No. 173-0238
Brand :RS PRO
THB100.368
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RS Stock No. 171-8802
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THB940.32
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800:5 41 x 41mm Clip Fit 98mm 74mm 800A 45mm 5 A -5°C +55°C 74 x 45 x 98 mm - Surface Mount -
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THB596.97
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200:1 21 x 10mm - 65mm 45mm - 40mm - - - 45 x 40 x 65 mm - - -
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THB1,214.08
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1500:5 100 x 30mm Clip Fit 155mm 140mm 1.5kA 45mm 5 A -5°C +55°C 140 x 45 x 155 mm - Surface Mount -
RS Stock No. 124-3891
Brand :RS PRO
THB92.76
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- - - - - 50 → 125A - - -55°C +130°C 34.9 x 14.3 x 34.9 mm - PCB Mount -
RS Stock No. 171-8763
Brand :RS PRO
THB343.35
Each
Units
80:5 30 x 10mm Clip Fit 70mm 50mm 80A 31mm 5 A -5°C +55°C 50 x 31 x 70 mm - Surface Mount -
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