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 175-6171
製造零件編號4NC5225-0DE21
BrandSiemens
TWD2,225.00
單位
400:1 - Window - - 400A 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
RS庫存編號 175-6187
製造零件編號4NC5327-0DE21
BrandSiemens
TWD3,755.00
單位
600:1 - Window - - 600A 1 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 175-6172
製造零件編號4NC5225-2CE21
BrandSiemens
TWD2,585.00
單位
400:5 - Window - - 400A 5 A 67.6mm -30°C 60.6mm +55°C 78.4mm 60.6 x 78.4 x 67.6 mm Sentron Power Monitoring Devices
RS庫存編號 175-6222
製造零件編號4NC5923-5LT21
BrandSiemens
TWD144.00
單位
- - - - - - - - - - - - - 4NC51 Current Transformers
RS庫存編號 175-6188
製造零件編號4NC5327-2CE21
BrandSiemens
TWD2,192.00
單位
600:5 - Window - - 600A 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 175-6145
製造零件編號4NC5122-0CE21
BrandSiemens
TWD2,217.00
單位
200:1 20mm Window - - 200A 1 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 175-6181
製造零件編號4NC5325-2DE21
BrandSiemens
TWD3,030.00
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 123-9519
製造零件編號4NC5223-0CE20
BrandSiemens
TWD2,355.00
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 175-6206
製造零件編號4NC5434-2CH21
BrandSiemens
TWD3,315.00
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 175-6195
製造零件編號4NC5431-0CH21
BrandSiemens
TWD3,716.00
單位
800:1 - Window - - 800A 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 175-6168
製造零件編號4NC5224-2CE21
BrandSiemens
TWD2,585.00
單位
300:5 - Window - - 300A 5 A 67.6mm -30°C 60.6mm +55°C 78.4mm 60.6 x 78.4 x 67.6 mm Sentron Power Monitoring Devices
RS庫存編號 175-6149
製造零件編號4NC5122-2FC21
BrandSiemens
TWD3,030.00
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 175-6146
製造零件編號4NC5122-0DE21
BrandSiemens
TWD2,355.00
單位
200:1 20mm Window - - 200A 1 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 175-6173
製造零件編號4NC5225-2DE21
BrandSiemens
TWD2,323.00
單位
400:5 - Window - - 400A 5 A 67.6mm -30°C 60.6mm +55°C 78.4mm 60.6 x 78.4 x 67.6 mm Sentron Power Monitoring Devices
RS庫存編號 175-6182
製造零件編號4NC5326-0CE21
BrandSiemens
TWD3,282.00
單位
500:1 - Window - - 500A 1 A 84.1mm -30°C 82.5mm +55°C 98mm 82.5 x 98 x 84.1 mm Sentron Power Monitoring Devices
全新
RS庫存編號 210-3465
製造零件編號3RB2906-2JG1
BrandSiemens
TWD6,653.00
單位
10 - 100A - Straight Through - - - - 94.1mm - 54.8mm - - - -
RS庫存編號 175-6166
製造零件編號4NC5224-0CE21
BrandSiemens
TWD2,854.00
單位
300:1 - Window - - 300A 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
全新
RS庫存編號 213-1329
製造零件編號5SV8703-0KK
BrandSiemens
TWD7,374.00
單位
- - - - - 200A 30 mA 33mm - 130mm - - - -
RS庫存編號 175-6223
製造零件編號4NC5925-5LT21
BrandSiemens
TWD131.00
單位
- - - - - - - - - - - - - 4NC52 Current Transformers
全新
RS庫存編號 213-1331
製造零件編號5SV8705-0KK
BrandSiemens
TWD17,995.00
單位
- - - - - 500A 300 mA 33mm - 230mm - - - -