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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Description 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庫存編號 533-0643
製造零件編號CTSCM40-200/5
BrandHOBUT
HK$383.35
單位
200:5 - Clip Fit 104.5mm 116mm 35.5mm - - -30°C +80°C - - - -
RS庫存編號 173-0070
製造零件編號AX-0500
HK$32.574
個 (以毎盒:250)
單位
- - - - - - 5A - -40°C +120°C 12.7 x 17 x 9.53 mm - Through Hole -
RS庫存編號 173-0058
製造零件編號AP-1500
HK$26.822
個 (以毎盒:250)
單位
- - - - - - 10A - -40°C +85°C 17.2 x 9.53 x 20.4 mm - - -
RS庫存編號 881-7900
製造零件編號CTPROXT40
BrandABB
HK$161.84
單位
- 18mm - - - - - - -5°C +50°C 45 x 96 x 69 mm - BusBar, DIN Rail CT PRO XT
RS庫存編號 881-7932
製造零件編號CTPROXT40SELV
BrandABB
HK$188.58
單位
- 18mm - - - - - - -5°C +50°C 45 x 96 x 69 mm - BusBar, DIN Rail CT PRO XT SELV
RS庫存編號 751-1636
製造零件編號93487 P1
HK$155.66
單位
- - - - - - 400A - -20°C +70°C 80 (Dia.) x 20 mm - Stand Alone -
RS庫存編號 832-9857
製造零件編號L01-8001
BrandAlttec
HK$113.46
單位
50:5 21.5mm Clip Fit 65mm 45mm 30mm - - - +40°C 65 x 45 x 67 mm - - -
RS庫存編號 782-6809
製造零件編號8-1611461-1
HK$207.95
單位
- - - - - - - - - - 6.67 x 5.54 x 6.65 mm - Chassis -
RS庫存編號 819-9798
製造零件編號140AS
BrandEfergy
HK$127.68
單位
- 19mm - - - - - - - - - Oscilloscopes - -
RS庫存編號 897-6924
製造零件編號4 121 57
BrandLegrand
HK$1,672.40
單位
250:5 - Base Mounted - - - - - -25°C +50°C 107 x 58.5 x 56 mm Ammeter, Electricity Meter, Measurement Control Unit Surface Mount -
RS庫存編號 886-2099
製造零件編號XW01-045081S000000
HK$137.32
單位
5:5 - Base Mounted - - - - - - - 62 x 40 x 78 mm - Surface Mount Omega XMER
RS庫存編號 170-9247
製造零件編號53030C
HK$6.575
個 (在毎卷:1000)
單位
- - - - - - 10A - -40°C +125°C 8.3 x 7.2 x 5.4 mm - Surface Mount -
RS庫存編號 715-7024
製造零件編號53030C
HK$13.96
單位
- - - - - - 10A - -40°C +125°C 8.3 x 7.2 x 5.4 mm - Surface Mount -
RS庫存編號 313-823
製造零件編號CT174M800/5-2.5/1-001
BrandHOBUT
HK$191.76
單位
800:5 40mm Base Mounted 95mm 70mm 55mm - - -30°C +85°C - - - -
RS庫存編號 886-2102
製造零件編號XW01-075081S000000
HK$157.50
單位
15:5 - Base Mounted - - - - - - - 62 x 40 x 78 mm - Surface Mount Omega XMER
RS庫存編號 106-8532
製造零件編號56100C
HK$12.794
毎管:25 個
單位
- - - - - - 10A - -40°C +85°C 16.79 x 8.89 x 20.19 mm - Through Hole -
RS庫存編號 913-9738
製造零件編號METSECT5CC020
HK$403.88
單位
200:5 21mm Tropicalise - - - - - -25°C +60°C 65 x 44 x 30 mm - DIN Rail -
RS庫存編號 173-0061
製造零件編號AC-1100
HK$26.715
個 (以毎盒:27)
單位
- - - - - - 100A - -40°C +120°C 44.5 x 14.3 x 44.5 mm - Through Hole -
RS庫存編號 886-2130
製造零件編號XM02-245081S000000
HK$106.70
單位
200:5 21mm Base Mounted - - - - - - - 45 x 40 x 65 mm - Surface Mount Omega XMER
RS庫存編號 257-830
製造零件編號CT173M400/5-2.5/1-002
BrandHOBUT
HK$172.05
單位
400:5 40mm Base Mounted 95mm 70mm 55mm - - -30°C +85°C - - - -