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庫存編號 171-8821
BrandRS PRO
HK$354.83
單位
2000:5 100 x 30mm Clip Fit 155mm - 140mm - 2000A 45mm 5 A -5°C +55°C 140 x 45 x 155 mm -
RS庫存編號 171-8822
BrandRS PRO
HK$354.83
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2500:5 100 x 30mm Clip Fit 155mm - 140mm - 2500A 45mm 5 A -5°C +55°C 140 x 45 x 155 mm -
RS庫存編號 171-8831
BrandRS PRO
HK$249.89
單位
300:5 45mm Base Mounted 102.5mm - 141mm - 300A 38mm 5 A - - 141 x 38 x 102.5 mm MCCB
RS庫存編號 171-8823
BrandRS PRO
HK$409.77
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3000:5 100 x 30mm Clip Fit 155mm - 140mm - 3000A 45mm 5 A -5°C +55°C 140 x 45 x 155 mm -
RS庫存編號 173-0044
BrandRS PRO
HK$10.622
個 (以毎盒:351)
單位
15:1 - - - - - - 15A - - -40°C +120°C 17.2 x 9.53 x 20.4 mm -
RS庫存編號 124-3898
BrandRS PRO
HK$19.66
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5:1 - - - - - - 5A - - -40°C +120°C 17.2 x 9.53 x 20.4 mm -
RS庫存編號 171-8832
BrandRS PRO
HK$249.89
單位
400:5 45mm Base Mounted 102.5mm - 141mm - 400A 38mm 5 A - - 141 x 38 x 102.5 mm MCCB
RS庫存編號 173-0041
BrandRS PRO
HK$9.897
個 (以毎盒:351)
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15:1 - - - - - - 15A - - -40°C +120°C 17.2 x 9.53 x 20.4 mm -
RS庫存編號 124-3903
BrandRS PRO
HK$43.91
單位
120:1 - - - - - - 120A - - -40°C +85°C 17.2 x 9.53 x 20.4 mm -
RS庫存編號 171-8841
BrandRS PRO
HK$513.45
單位
1250:5 101 x 56mm Clip Fit 170mm - 130mm - 1250A 60mm 5 A -5°C +55°C 130 x 60 x 170 mm -
RS庫存編號 171-8792
BrandRS PRO
HK$122.41
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500:5 40 x 11mm Clip Fit 78mm - 62mm - 500A 40mm 5 A -5°C +55°C 62 x 40 x 78 mm -
RS庫存編號 171-8782
BrandRS PRO
HK$153.68
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125:5 30 x 11mm Clip Fit 78mm - 62mm - 125A 40mm 5 A -5°C +55°C 62 x 40 x 78 mm -
RS庫存編號 171-8788
BrandRS PRO
HK$117.47
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250:5 40 x 11mm Clip Fit 78mm - 62mm - 250A 40mm 5 A -5°C +55°C 62 x 40 x 78 mm -
RS庫存編號 171-8846
BrandRS PRO
HK$312.30
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100:5 33 x 23mm Base Mounted 106mm - 93mm - 100A 40mm 5 A +20°C +70°C 93 x 40 x 106 mm -
RS庫存編號 124-3899
BrandRS PRO
HK$32.99
單位
7.5:1 - - - - - - 7.5A - - -40°C +120°C 17.2 x 9.53 x 20.4 mm -
RS庫存編號 171-8765
BrandRS PRO
HK$86.21
單位
100:5 30 x 10mm Clip Fit 70mm - 50mm - 100A 31mm 5 A -5°C +55°C 50 x 31 x 70 mm -
RS庫存編號 173-0198
BrandRS PRO
HK$37.626
個 (以毎盒:176)
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375:1 - - - - - - 375A - - -55°C +130°C 30.2 x 14.3 x 30.2 mm -
RS庫存編號 171-8754
BrandRS PRO
HK$143.68
單位
100:1 21 x 10mm - 65mm - 45mm - - 40mm - - - 45 x 40 x 65 mm -
RS庫存編號 171-8824
BrandRS PRO
HK$212.41
單位
100:5 35mm Base Mounted 87.5mm - 105mm - 100A 38mm 5 A - - 105 x 38 x 87.5 mm MCCB
RS庫存編號 124-3896
BrandRS PRO
HK$33.79
單位
25:1 - - - - - - 25A - - -40°C +85°C 19 x 11.5 x 21.5 mm -