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 833-2778
製造零件編號DM4T1500
BrandLovato
HK$582.67
單位
1500:5 86mm Base Mounted 81.5mm 71mm 62.5mm - - -25°C +50°C - - - -
RS庫存編號 775-4909
製造零件編號AZ-0500
HK$34.25
單位
- - - - - - 25A - -40°C +85°C 19.0 x 11.5 x 21.5 mm - Flying Lead -
RS庫存編號 871-1644
製造零件編號B82801C1265A150
BrandEPCOS
HK$23.50
個 (以毎袋:3)
單位
- - - - - - 40A - -40°C +125°C 14.22 x 13.46 x 10 mm - Surface Mount -
RS庫存編號 124-3889
BrandRS PRO
HK$19.88
單位
- - - - - - 30 → 75A - -55°C +130°C 30.2 x 14.3 x 30.2 mm - PCB Mount -
RS庫存編號 175-6125
製造零件編號3UL2305-1A
BrandSiemens
HK$2,154.03
單位
- - Toroidal Ring 64mm 163mm 169mm 30 mA → 40 A 400 A -25°C +60°C 163 x 169 x 64 mm Fault Current Monitoring Chassis Mount -
RS庫存編號 175-6133
製造零件編號4NC5115-0CC21
BrandSiemens
HK$640.21
單位
75:1 - Window 65.6mm 60mm 75.3mm 75A 1 A -30°C +55°C 60 x 75.3 x 65.6 mm Sentron Power Monitoring Devices Chassis Mount Sentron
RS庫存編號 886-2213
製造零件編號XM20-425141S000000
HK$233.70
單位
1500:5 60mm Base Mounted - - - - - - - 86 x 45 x 110 mm - Surface Mount Omega XMER
RS庫存編號 287-3175
製造零件編號CT153M120/5-2.5/1
BrandHOBUT
HK$131.78
單位
120:5 26mm Universal Mounted 75mm 54.5mm 68mm - - -20°C +70°C - - - -
RS庫存編號 124-3890
BrandRS PRO
HK$22.35
單位
- - - - - - 40 → 125A - -55°C +130°C 34.9 x 14.3 x 34.9 mm - PCB Mount -
RS庫存編號 175-6162
製造零件編號4NC5223-0CE21
BrandSiemens
HK$640.21
單位
250:1 - Window 67.6mm 60.6mm 78.4mm 250A 1 A -30°C +55°C 60.6 x 78.4 x 67.6 mm Sentron Power Monitoring Devices Chassis Mount Sentron
RS庫存編號 136-6366
製造零件編號XM22-395141S000000
HK$241.40
單位
1000:5 72mm - 104mm 104mm 45mm 1kA 5 A - - 104 x 45 x 104 mm - BusBar, Cable Mount, DIN Rail, Wall Mount Omega
RS庫存編號 175-6134
製造零件編號4NC5115-2CC21
BrandSiemens
HK$580.00
單位
75:5 - Window 65.6mm 60mm 75.3mm 75A 5 A -30°C +55°C 60 x 75.3 x 65.6 mm Sentron Power Monitoring Devices Chassis Mount Sentron
RS庫存編號 175-6210
製造零件編號4NC5435-2CH21
BrandSiemens
HK$1,063.87
單位
1500:5 - Window 84.1mm 112mm 127.5mm 1.5kA 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 832-9860
製造零件編號L01-8003
BrandAlttec
HK$110.89
單位
100:5 21.5mm Clip Fit 65mm 45mm 30mm - - - +40°C 65 x 45 x 67 mm - - -
RS庫存編號 174-3481
製造零件編號2906233
HK$3,471.81
單位
- - DIN Rail Mounted 120.5mm 6.2mm 110.5mm 1 kA, 1.5 kA, 2 kA, 4 kA, 100 A, 250 A, 400 A, 630 A 0 → 21 mA -40 °C, -30 °C +70 °C, +80 °C 6.2 x 110.5 x 120.5 mm Retrofitting DIN Rail PACT RCP
RS庫存編號 897-6930
製造零件編號4 121 52
BrandLegrand
HK$2,154.80
單位
2500:5 - Base Mounted - - - - - -25°C +50°C 160 x 125 x 40 mm Ammeter, Electricity Meter, Measurement Control Unit Surface Mount -
RS庫存編號 287-3181
製造零件編號CT153M150/5-2.5/1
BrandHOBUT
HK$151.59
單位
150:5 26mm Universal Mounted 75mm 54.5mm 68mm - - -20°C +70°C - - - -
RS庫存編號 175-6184
製造零件編號4NC5326-2CE21
BrandSiemens
HK$679.03
單位
500:5 - Window 84.1mm 82.5mm 98mm 500A 5 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 167-0562
製造零件編號B82801C0145A050
BrandEPCOS
HK$16.298
個 (在毎卷:200)
單位
- - - - - - 40A - -40°C +125°C 14.22 x 13.46 x 10 mm - Surface Mount -
RS庫存編號 751-1617
製造零件編號93482 P1
HK$204.00
單位
- - - - - - 100A - -20°C +70°C 70 (Dia.) x 36 mm - Stand Alone -