Current Transformers

Current transformers or (CT’s) are instruments that are used to transform the current from a high current into a lower current so that the power can then be used for measuring and controlling. The transformers consist of a core, a primary and a secondary winding.RS Components offer an extensive range of highly accurate CT’s in various transformer types, current ratings, CT ratio supply voltages and mounting types to suit every application. Supplied by industry-leading brands including Siemens, Murata Power Solutions LEM and of course RS PRO.

How does a current transformer work?

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.

Types of current transformer

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.

Where would I use a current transformer?

CT's are used in a wide range of industrial and commercial measurement applications. Some of the most common are:Generating stationsElectrical substationsCommercial electric power distributionElectrical panels


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Description Price Current Ratio Bore Size Transformer Type Sensor Technology Supply Voltage Input Current Output Current Overall Height Minimum Temperature Overall Width Maximum Temperature Overall Depth Dimensions For Use With
全新
RS庫存編號 218-1939
製造零件編號TASI50D100
BrandIME
HK$409.24
單位
1000/5A 51 X 31 mm, 64 X 11 mm - - - 1kA 5 A 130mm - 90mm - - - -
RS庫存編號 198-790
製造零件編號AT 10 B5
BrandLEM
HK$436.93
單位
10:1 16mm - - - 10A - 67mm -20°C 44.5mm +60°C 36.5mm - -
RS庫存編號 175-6149
製造零件編號4NC5122-2FC21
BrandSiemens
HK$812.17
單位
200:5 - Window - - 200A 5 A 65.6mm -30°C 60mm +55°C 75.3mm 60 x 75.3 x 65.6 mm Sentron Power Monitoring Devices
全新
RS庫存編號 211-1867
製造零件編號LUTC0501
HK$449.22
單位
50A - Base Mounted - - 50A 1 A 86mm - 57mm - - - -
RS庫存編號 198-4487
製造零件編號METSECT5DE150
HK$1,308.39
單位
1500:5 - Tropicalise - - 1500A 5 A 129mm -25°C 135mm +50°C 85mm - -
RS庫存編號 521-982
製造零件編號HAT 1200-S
BrandLEM
HK$592.17
單位
2500:1 40.5 x 30.5mm - Open Loop 15 V 2500A - 65mm -10°C 90mm +80°C 37mm - -
RS庫存編號 198-857
製造零件編號TT 50-SD
BrandLEM
HK$202.83
單位
50:1 8mm - - - 50A 16.66 mA 43mm -25°C 36.5mm +70°C 31.5mm - -
RS庫存編號 729-5520
製造零件編號AC-1200
HK$85.17
單位
200:1 - - - - 200A - - -40°C - +120°C - 55.6 x 20.6 x 55.6 mm -
RS庫存編號 171-8772
BrandRS PRO
HK$148.41
單位
250:1 30 x 10mm - - - - - 70mm - 50mm - 30mm 50 x 30 x 70 mm -
RS庫存編號 180-9997
製造零件編號MR-1
BrandKEMET
HK$84.095
個 (以毎盒:80)
單位
- 7.2mm - - - - - - - - - - - -
RS庫存編號 171-8839
BrandRS PRO
HK$762.26
單位
2500:5 38 x 128mm Base Mounted - - 2500A 5 A 170mm -5°C 99mm +55°C 45mm 99 x 45 x 170 mm -
RS庫存編號 175-6218
製造零件編號4NC5440-2DM21
BrandSiemens
HK$1,228.40
單位
2500:5 - Window - - 2500A 5 A 84.1mm -30°C 112mm +55°C 127.5mm 112 x 127.5 x 84.1 mm Sentron Power Monitoring Devices
RS庫存編號 124-3900
BrandRS PRO
HK$40.10
單位
1000:1 5mm - - - 10A - - -40°C - +120°C - 17.2 x 9.53 x 20.4 mm -
RS庫存編號 175-6148
製造零件編號4NC5122-2DE21
BrandSiemens
HK$553.45
單位
200:5 - Window - - 200A 5 A 65.6mm -30°C 60mm +55°C 75.3mm 60 x 75.3 x 65.6 mm Sentron Power Monitoring Devices
RS庫存編號 331-452
製造零件編號CT132M200/5-2.5/0.5
BrandHOBUT
HK$149.50
單位
200:5 21mm DIN Rail Mounted - - 200A 5 A 65mm -30°C 45mm +85°C 30mm - -
RS庫存編號 527-8567
製造零件編號DHR 500 C10
BrandLEM
HK$2,303.02
單位
500:1 32mm - Open Loop 20 → 50 V dc 500A - 70mm -40°C 90mm +70°C 25mm - -
RS庫存編號 331-402
製造零件編號CT143M80/5-1.5/1-001
BrandHOBUT
HK$143.20
單位
80:5 24mm DIN Rail Mounted - - 80A 5 A 70mm -30°C 49mm +85°C 45mm - -
RS庫存編號 136-6362
製造零件編號XM07-275081S000000
HK$104.07
單位
250:5 26mm - - - 250A 5 A 70mm - 50mm - 44.5mm 50 x 44.5 x 70 mm -
RS庫存編號 381-0822
製造零件編號CT196M1600/5-5/1
BrandHOBUT
HK$261.80
單位
1600:5 45mm Base Mounted - - - - 126mm -30°C 90mm +85°C 60mm - -
RS庫存編號 162-0255
製造零件編號B82801B0504A050
BrandEPCOS
HK$11.949
個 (在毎卷:900)
單位
20:1 - - - - 20A - - -40°C - +125°C - 8.13 x 7.11 x 5.08 mm -