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
RS庫存編號 302-6077
製造零件編號2814359
HK$2,567.42
單位
5:1 - - - - 5A 0 → 20 mA 99mm -25°C 22.5mm +60°C 114.5mm - -
RS庫存編號 174-3480
製造零件編號2906232
HK$3,654.26
單位
4000:1 - DIN Rail Mounted - - 4000A 0 → 21 mA 120.5mm -40 °C, -30°C 6.2mm +70 °C, +80°C 110.5mm 6.2 x 110.5 x 120.5 mm Retrofitting
RS庫存編號 175-0485
製造零件編號2864671
HK$241.54
單位
- - - - - - - - - - - - - -
RS庫存編號 820-0444
製造零件編號2904923
HK$3,269.47
單位
4000:1 8.3mm - - 24 V dc 4000A 0 → 1 A 70.4mm -30°C 22.5mm +80°C 85mm - -
RS庫存編號 175-0491
製造零件編號2906235
HK$3,574.75
單位
4000:1 - DIN Rail Mounted - - 4000A 0 → 10 mA, 0 → 20 mA, 0 → 21 mA, 2 → 10 mA, 4 → 20 mA 110.5mm -40 °C, -30°C 120.5mm +70 °C, +80°C 6.2mm 6.2 x 120.5 x 110.5 mm Retrofitting
RS庫存編號 174-3482
製造零件編號2906231
HK$3,602.03
單位
4000:1 - DIN Rail Mounted - - 4000A 0 → 21 mA 120.5mm -40 °C, -30°C 6.2mm +70 °C, +80°C 110.5mm 6.2 x 110.5 x 120.5 mm Retrofitting
RS庫存編號 174-3481
製造零件編號2906233
HK$3,602.03
單位
4000:1 - DIN Rail Mounted - - 4000A 0 → 21 mA 120.5mm -40 °C, -30°C 6.2mm +70 °C, +80°C 110.5mm 6.2 x 110.5 x 120.5 mm Retrofitting
RS庫存編號 801-6283
製造零件編號2308043
HK$2,687.76
單位
300:1 32mm - - 24 V dc 300A 4 → 20 mA 33.8mm -40°C 90mm +65°C 85mm - -
RS庫存編號 337-2724
製造零件編號2814731
HK$4,728.17
單位
- - - - 20 → 30 V dc - - - - - - - - -
RS庫存編號 175-0493
製造零件編號2906234
HK$3,565.29
單位
4000:1 - DIN Rail Mounted - - 4000A 0 → 10 mA, 0 → 20 mA, 0 → 21 mA, 2 → 10 mA, 4 → 20 mA 110.5mm -40 °C, -30°C 120.5mm +70 °C, +80°C 6.2mm 6.2 x 120.5 x 110.5 mm Retrofitting
RS庫存編號 801-6255
製造零件編號2813457
HK$2,524.31
單位
100:1 18.5mm - - 20 → 30 V dc 100A - 85mm -20°C 55mm +60°C 70.5mm - -
RS庫存編號 174-3476
製造零件編號2910327
HK$3,412.45
單位
4000:1 - DIN Rail Mounted - - 4000A 1 A 70.4mm -30 °C, -20°C 22.5mm +70 °C, +80°C 85mm 22.5 x 85 x 70.4 mm Retrofitting
全新
RS庫存編號 207-4842
製造零件編號1058044
HK$5,407.65
單位
- - DIN Rail Mounted - - -, 1 kA, 1.5 kA, 2 kA, 4 kA, 100 A, 250 A, 400 A, 630 A 1 A 85mm - 22.5mm - - - -
RS庫存編號 174-3479
製造零件編號2910325
HK$3,365.86
單位
4000:1 - DIN Rail Mounted - - 4000A 1 A 70.4mm -30 °C, -20°C 22.5mm +70 °C, +80°C 85mm 22.5 x 85 x 70.4 mm Retrofitting
RS庫存編號 337-2718
製造零件編號2814715
HK$4,263.94
單位
11:1 - - - 20 → 30 V dc 11A 0 → 20 mA 99mm -20°C 22.5mm +60°C 114.5mm - -
RS庫存編號 715-7989
製造零件編號2308030
HK$2,639.94
單位
200:1 32mm - - 20 → 30 V dc 200A 4 → 20 mA 70mm -40°C 90mm +65°C 33.8mm - -
RS庫存編號 175-0490
製造零件編號2907888
HK$98.53
單位
- - - - - - - - - - - - - -
全新
RS庫存編號 212-7348
製造零件編號2308108
HK$2,502.47
單位
- - DIN Rail Mounted Voltage 20 → 30 V - - - - - - - - -
RS庫存編號 801-6296
製造零件編號2810625
HK$2,937.26
單位
5:1 - - - 19.2 → 253 V ac/dc 5A 0 → 20 mA 104mm -20°C 22.5mm +65°C 114.5mm - -
RS庫存編號 175-0492
製造零件編號2906236
HK$3,602.03
單位
4000:1 - DIN Rail Mounted - - 4000A 0 → 10 mA, 0 → 20 mA, 0 → 21 mA, 2 → 10 mA, 4 → 20 mA 110.5mm -40 °C, -30°C 120.5mm +70 °C, +80°C 6.2mm 6.2 x 120.5 x 110.5 mm Retrofitting