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 510-9152
製造零件編號7KT1201
BrandSiemens
HK$883.07
單位
- 13mm Straight Through - - - - - - - - - - -
RS庫存編號 175-6204
製造零件編號4NC5433-2DH21
BrandSiemens
HK$1,203.21
單位
1200:5 - Window - - 1200A 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 175-6205
製造零件編號4NC5434-0CH21
BrandSiemens
HK$1,418.07
單位
1250:1 - Window - - 1250A 1 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 175-6213
製造零件編號4NC5438-0CJ21
BrandSiemens
HK$1,568.47
單位
2000:1 - Window - - 2000A 1 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 175-6206
製造零件編號4NC5434-2CH21
BrandSiemens
HK$804.99
單位
1250:5 - Window - - 1250A 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 175-6214
製造零件編號4NC5438-2CJ21
BrandSiemens
HK$877.82
單位
2000:5 - Window - - 2000A 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 175-6224
製造零件編號4NC5930-5LT21
BrandSiemens
HK$40.92
單位
- - - - - - - - - - - - - 4NC53 Current Transformers
RS庫存編號 123-9507
製造零件編號4NC5115-0BC20
BrandSiemens
HK$967.08
單位
75:1 17.5mm Window - - 75A 1 A - -10°C - 55°C - 74.5 x 48 x 80 mm Measuring Devices
RS庫存編號 175-6125
製造零件編號3UL2305-1A
BrandSiemens
HK$2,653.51
單位
40:1 - Toroidal Ring - - 40A 400 A 64mm -25°C 163mm +60°C 169mm 163 x 169 x 64 mm Fault Current Monitoring
RS庫存編號 175-6138
製造零件編號4NC5117-2CC21
BrandSiemens
HK$692.92
單位
100:5 - Window - - 100A 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 175-6215
製造零件編號4NC5438-2DL21
BrandSiemens
HK$1,589.96
單位
2000:5 - Window - - 2000A 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 123-9519
製造零件編號4NC5223-0CE20
BrandSiemens
HK$571.86
單位
250:1 28mm Window - - 250A 1 A - -10°C - 55°C - 80 x 64 x 85.5 mm Measuring Devices
RS庫存編號 175-6225
製造零件編號4NC5940-5LT21
BrandSiemens
HK$38.87
單位
- - - - - - - - - - - - - 4NC54 Current Transformers
RS庫存編號 175-6207
製造零件編號4NC5435-0CH21
BrandSiemens
HK$1,097.25
單位
1500:1 - Window - - 1500A 1 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 175-6216
製造零件編號4NC5440-0CJ21
BrandSiemens
HK$1,729.61
單位
2500:1 - Window - - 2500A 1 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 175-6175
製造零件編號4NC5228-2FE21
BrandSiemens
HK$571.86
單位
700:5 - Window - - 700A 5 A 62.2mm -30°C 59.5mm +55°C 75.3mm 59.5 x 75.3 x 62.2 mm Sentron Power Monitoring Devices
RS庫存編號 175-6177
製造零件編號4NC5232-2FE21
BrandSiemens
HK$833.65
單位
1000:5 30mm Window - - 1000A 5 A 62.2mm -30°C 59.5mm +55°C 75.3mm 59.5 x 75.3 x 62.2 mm Sentron Power Monitoring Devices
RS庫存編號 175-6181
製造零件編號4NC5325-2DE21
BrandSiemens
HK$812.17
單位
400:5 - Window - - 400A 5 A 84.1mm -30°C 82.5mm +55°C 98mm 82.5 x 98 x 84.1 mm Sentron Power Monitoring Devices
RS庫存編號 175-6139
製造零件編號4NC5117-2DA21
BrandSiemens
HK$801.42
單位
100:5 - Window - - 100A 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 175-6159
製造零件編號4NC5222-0DE21
BrandSiemens
HK$579.61
單位
200:1 30mm Window - - 200A 1 A 67.6mm -30°C 60.6mm +55°C 78.4mm 60.6 x 78.4 x 67.6 mm Sentron Power Monitoring Devices