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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รายละเอียดสินค้า / Description ราคา / 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. 173-0181
Brand :RS PRO
THB663.687
Each (In a Box of 351)
Units
- - - - - - 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
THB136.53
Each
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- - - - - - 50A - -40°C +85°C 19 x 11.5 x 21.5 mm - PCB Mount -
RS Stock No. 124-3882
Brand :RS PRO
THB65.07
Each
Units
- - - - - - 1 10A - -40°C +120°C 17.2 x 9.53 x 20.4 mm - PCB Mount -
RS Stock No. 124-3893
Brand :RS PRO
THB194.79
Each
Units
- - - - - - 75 200A - -55°C +130°C 38.1 x 15.9 x 38.1 mm - PCB Mount -
RS Stock No. 173-0220
Brand :RS PRO
THB883.029
Each (In a Box of 140)
Units
- - - - - - 25A - -40°C +85°C 19 x 11.5 x 21.5 mm - - -
RS Stock No. 173-0217
Brand :RS PRO
THB883.026
Each (In a Box of 114)
Units
- - - - - - 75 200A - -55°C +130°C 38.1 x 15.9 x 38.1 mm - PCB Mount -
RS Stock No. 124-3885
Brand :RS PRO
THB343.04
Each
Units
- - - - - - 10 60A - -55°C +130°C 23.8 x 11.12 x 23.8 mm - PCB Mount -
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. 173-0235
Brand :RS PRO
THB1,217.704
Each (In a Box of 351)
Units
- - - - - - 10A - -40°C +120°C 17.2 x 9.53 x 20.4 mm - PCB Mount -
RS Stock No. 124-3892
Brand :RS PRO
THB104.79
Each
Units
- - - - - - 60 200A - -55°C +130°C 38.1 x 15.9 x 38.1 mm - PCB Mount -
RS Stock No. 124-3896
Brand :RS PRO
THB127.83
Each
Units
- - - - - - 25A - -40°C +85°C 19 x 11.5 x 21.5 mm - - -
RS Stock No. 124-3879
Brand :RS PRO
THB45.65
Each
Units
- - - - - - 15A - -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
Each (In a Box of 114)
Units
- - - - - - 60 200A - -55°C +130°C 38.1 x 15.9 x 38.1 mm - PCB Mount -
RS Stock No. 124-3900
Brand :RS PRO
THB72.90
Each
Units
- - - - - - 10A - -40°C +120°C 17.2 x 9.53 x 20.4 mm - PCB Mount -
RS Stock No. 173-0041
Brand :RS PRO
THB45.10
Each (In a Box of 351)
Units
- - - - - - 15A - -40°C +120°C 17.2 x 9.53 x 20.4 mm - PCB Mount -
RS Stock No. 171-8847
Brand :RS PRO
THB1,281.17
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150:5 33 x 23mm Base Mounted 106mm 93mm 40mm 150A 5 A +20°C +70°C 93 x 40 x 106 mm - Surface Mount -
RS Stock No. 171-8843
Brand :RS PRO
THB3,144.93
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Units
1600:5 101 x 56mm Clip Fit 170mm 130mm 60mm 1.6kA 5 A -5°C +55°C 130 x 60 x 170 mm - Surface Mount -
RS Stock No. 171-8844
Brand :RS PRO
THB3,415.81
Each
Units
2000:5 101 x 56mm Clip Fit 170mm 130mm 60mm 2kA 5 A -5°C +55°C 130 x 60 x 170 mm - Surface Mount -
RS Stock No. 171-8852
Brand :RS PRO
THB1,918.59
Each
Units
500:5 55 x 43mm Base Mounted 125mm 108mm 51mm 500A 5 A +20°C +70°C 108 x 51 x 125 mm - Surface Mount -
RS Stock No. 171-8848
Brand :RS PRO
THB1,311.30
Each
Units
200:5 33 x 23mm Base Mounted 106mm 93mm 40mm 200A 5 A +20°C +70°C 93 x 40 x 106 mm - Surface Mount -
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