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 171-8801
BrandRS PRO
HK$230.06
單位
600:5 41 x 41mm Clip Fit 98mm 74mm 45mm 600A 5 A -5°C +55°C 74 x 45 x 98 mm - Surface Mount -
RS庫存編號 171-8802
BrandRS PRO
HK$234.98
單位
800:5 41 x 41mm Clip Fit 98mm 74mm 45mm 800A 5 A -5°C +55°C 74 x 45 x 98 mm - Surface Mount -
RS庫存編號 171-8811
BrandRS PRO
HK$254.88
單位
800:5 80 x 12mm Clip Fit 126mm 104mm 45mm 800A 5 A -5°C +55°C 104 x 45 x 126 mm - Surface Mount -
RS庫存編號 171-8766
BrandRS PRO
HK$85.80
單位
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庫存編號 171-8760
BrandRS PRO
HK$104.45
單位
200:5 21 x 10mm Clip Fit 65mm 45mm 40mm 200A 5 A -5°C +55°C 45 x 40 x 65 mm - Surface Mount -
RS庫存編號 171-8812
BrandRS PRO
HK$267.35
單位
1000:5 80 x 12mm Clip Fit 126mm 104mm 45mm 1kA 5 A -5°C +55°C 104 x 45 x 126 mm - Surface Mount -
RS庫存編號 171-8804
BrandRS PRO
HK$242.53
單位
1000:5 41 x 41mm Clip Fit 98mm 74mm 45mm 1kA 5 A -5°C +55°C 74 x 45 x 98 mm - Surface Mount -
RS庫存編號 171-8767
BrandRS PRO
HK$130.53
單位
- - - - - - - - - - - - - -
RS庫存編號 171-8821
BrandRS PRO
HK$353.15
單位
2000:5 100 x 30mm Clip Fit 155mm 140mm 45mm 2kA 5 A -5°C +55°C 140 x 45 x 155 mm - Surface Mount -
RS庫存編號 173-0045
BrandRS PRO
HK$20.897
個 (以毎盒:351)
單位
- - - - - - 15A - -40°C +120°C 17.2 x 9.53 x 20.4 mm - PCB Mount -
RS庫存編號 173-0200
BrandRS PRO
HK$23.406
個 (以毎盒:133)
單位
- - - - - - 50 → 125A - -55°C +130°C 34.9 x 14.3 x 34.9 mm - PCB Mount -
RS庫存編號 173-0235
BrandRS PRO
HK$34.257
個 (以毎盒:351)
單位
- - - - - - 10A - -40°C +120°C 17.2 x 9.53 x 20.4 mm - PCB Mount -
RS庫存編號 171-8842
BrandRS PRO
HK$595.68
單位
1500:5 101 x 56mm Clip Fit 170mm 130mm 60mm 1.5kA 5 A -5°C +55°C 130 x 60 x 170 mm - Surface Mount -
RS庫存編號 171-8813
BrandRS PRO
HK$242.53
單位
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庫存編號 171-8828
BrandRS PRO
HK$211.41
單位
200:5 35mm Base Mounted 87.5mm 105mm 38mm 200A 5 A - - 105 x 38 x 87.5 mm MCCB Surface Mount -
RS庫存編號 173-0237
BrandRS PRO
HK$39.738
個 (以毎盒:351)
單位
- - - - - - 10 → 20A - -40°C +85°C 17.2 x 9.53 x 20.4 mm - PCB Mount -
RS庫存編號 171-8761
BrandRS PRO
HK$104.45
單位
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庫存編號 173-0181
BrandRS PRO
HK$17.253
個 (以毎盒:351)
單位
- - - - - - 1 → 10A - -40°C +120°C 17.2 x 9.53 x 20.4 mm - PCB Mount -
RS庫存編號 171-8833
BrandRS PRO
HK$248.71
單位
600:5 45mm Base Mounted 102.5mm 141mm 38mm 600A 5 A - - 141 x 38 x 102.5 mm MCCB Surface Mount -
RS庫存編號 171-8792
BrandRS PRO
HK$121.84
單位
500:5 40 x 11mm Clip Fit 78mm 62mm 40mm 500A 5 A -5°C +55°C 62 x 40 x 78 mm - Surface Mount -