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 171-8751
BrandRS PRO
HK$98.74
單位
60:5 21 x 10mm Clip Fit 65mm 45mm 40mm 60A 5 A -5°C +55°C 45 x 40 x 65 mm - Surface Mount -
RS庫存編號 136-6369
製造零件編號XM22-415151S000000
HK$254.60
單位
1250:5 72mm - 104mm 104mm 45mm 1.25kA 5 A - - 104 x 45 x 104 mm - BusBar, Cable Mount, DIN Rail, Wall Mount Omega
RS庫存編號 123-6721
製造零件編號XN35-245031S000000
HK$229.54
單位
200:5 31mm Base Mounted - - - 200A 5 A - - 105 x 38 x 87.5 mm MCCB BusBar, DIN Rail, Plug In Omega
RS庫存編號 392-8175
製造零件編號ASK 412.4 200/5 A
HK$296.07
單位
200:5 30.5mm Base Mounted 88.5mm 70mm 58mm - - -5°C +40°C - - - -
RS庫存編號 881-7950
製造零件編號CTPROXT150SELV
BrandABB
HK$235.52
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 106-8537
製造零件編號56T100C
HK$13.52
毎管:25 個
單位
- - - - - - 10A - -40°C +85°C 16.79 x 8.89 x 20.19 mm - Through Hole -
全新
RS庫存編號 198-4496
製造零件編號METSECT5MA040
HK$515.72
單位
400:5 27mm Tropicalise 80mm 56mm 63mm 400A 5 A -25°C +60°C - - DIN rail -
RS庫存編號 171-8761
BrandRS PRO
HK$104.94
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 171-8805
BrandRS PRO
HK$223.68
單位
1000:5 61 x 51mm Clip Fit 110mm 86mm 45mm 1kA 5 A -5°C +55°C 86 x 45 x 110 mm - Surface Mount -
全新
RS庫存編號 198-4463
製造零件編號METSECT5CC010
HK$401.09
單位
100:5 21mm Tropicalise 65mm 44mm 37mm 100A 5 A -25°C +60°C - - DIN rail -
RS庫存編號 136-6370
製造零件編號XM22-425151S000000
HK$267.36
單位
1500:5 72mm - 104mm 104mm 45mm 1.5kA 5 A - - 104 x 45 x 104 mm - BusBar, Cable Mount, DIN Rail, Wall Mount Omega
RS庫存編號 123-6730
製造零件編號XS01-225221S 000000
HK$334.25
單位
150:5 33 x 23mm Clip Fit - - - - - - - 93 x 40 x 106 mm - Surface Mount Omega10
RS庫存編號 123-6722
製造零件編號XN35-275031S000000
HK$229.54
單位
250:5 31mm Base Mounted - - - 250A 5 A - - 105 x 38 x 87.5 mm MCCB BusBar, DIN Rail, Plug In Omega
RS庫存編號 175-6198
製造零件編號4NC5431-2DH21
BrandSiemens
HK$892.65
單位
800:5 - Window 84.1mm 112mm 127.5mm 800A 5 A -30°C +55°C 112 x 127.5 x 84.1 mm Sentron Power Monitoring Devices Chassis Mount Sentron
RS庫存編號 173-0235
BrandRS PRO
HK$34.42
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 175-6182
製造零件編號4NC5326-0CE21
BrandSiemens
HK$607.47
單位
500:1 - Window 84.1mm 82.5mm 98mm 500A 1 A -30°C +55°C 82.5 x 98 x 84.1 mm Sentron Power Monitoring Devices Chassis Mount Sentron
RS庫存編號 175-6186
製造零件編號4NC5327-0CE21
BrandSiemens
HK$736.33
單位
600:1 - Window 84.1mm 82.5mm 98mm 600A 1 A -30°C +55°C 82.5 x 98 x 84.1 mm Sentron Power Monitoring Devices Chassis Mount Sentron
全新
RS庫存編號 198-4506
製造零件編號METSECT5MC080
HK$716.14
單位
800:5 32mm Tropicalise 95mm 70mm 65mm 800A 5 A -25°C +60°C - - DIN rail -
RS庫存編號 167-0137
製造零件編號B82801B0925A200
BrandEPCOS
HK$11.371
個 (在毎卷:900)
單位
- - - - - - 20A - -40°C +125°C 8.13 x 7.11 x 5.08 mm - Surface Mount -
RS庫存編號 171-8817
BrandRS PRO
HK$324.83
單位
2000:5 80 x 12mm Clip Fit 126mm 104mm 45mm 2kA 5 A -5°C +55°C 104 x 45 x 126 mm - Surface Mount -