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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Nombre de résultats par page
Description Prix 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
N° de stock RS 715-7989
Référence fabricant2308030
211,21 €
Each
Unité
200:1 32mm - - 20 → 30 V dc 200A 4 → 20 mA 70mm -40°C 90mm +65°C 33.8mm - -
N° de stock RS 715-7970
Référence fabricant2308027
211,21 €
Each
Unité
100:1 32mm - - 20 → 30 V dc 100A 4 → 20 mA 70mm -40°C 90mm +65°C 33.8mm - -
N° de stock RS 801-6283
Référence fabricant2308043
232,43 €
Each
Unité
300:1 32mm - - 24 V dc 300A 4 → 20 mA 33.8mm -40°C 90mm +65°C 85mm - -
N° de stock RS 337-2718
Référence fabricant2814715
308,66 €
Each
Unité
11:1 - - - 20 → 30 V dc 11A 0 → 20 mA 99mm -20°C 22.5mm +60°C 114.5mm - -
N° de stock RS 801-6255
Référence fabricant2813457
214,54 €
Each
Unité
100:1 18.5mm - - 20 → 30 V dc 100A - 85mm -20°C 55mm +60°C 70.5mm - -
N° de stock RS 302-6077
Référence fabricant2814359
160,76 €
Each
Unité
5:1 - - - - 5A 0 → 20 mA 99mm -25°C 22.5mm +60°C 114.5mm - -
N° de stock RS 820-0435
Référence fabricant2904922
351,90 €
Each
Unité
4000:1 8.3mm - - 24 V dc 4000A 0 → 1 A 70.4mm -30°C 22.5mm +80°C 85mm - -
N° de stock RS 337-2746
Référence fabricant2814728
296,77 €
Each
Unité
55:1 - - - 20 → 30 V dc 55A 0 → 20 mA 99mm -20°C 22.5mm +60°C 114.5mm - -
N° de stock RS 801-6312
Référence fabricant2810612
183,56 €
Each
Unité
5:1 - - - 24 V dc 5A 0 → 20 mA 104mm -20°C 22.5mm +65°C 114.5mm - -
N° de stock RS 820-0444
Référence fabricant2904923
351,90 €
Each
Unité
4000:1 8.3mm - - 24 V dc 4000A 0 → 1 A 70.4mm -30°C 22.5mm +80°C 85mm - -
N° de stock RS 175-0490
Référence fabricant2907888
8,75 €
Each
Unité
- - - - - - - - - - - - - -
N° de stock RS 820-0431
Référence fabricant2904921
351,90 €
Each
Unité
4000:1 8.3mm - - 24 V dc 4000A 0 → 1 A 70.4mm -30°C 22.5mm +80°C 85mm - -
Nouveau
N° de stock RS 212-7346
Référence fabricant2277611
25,16 €
Each
Unité
- - DIN Rail Mounted - - 0 → 75 A, - - 66mm - 30mm - - - -
N° de stock RS 174-3475
Référence fabricant1033483
318,72 €
Each
Unité
- 8.3mm Rogowski Coil - - - 1 A 85.00mm -20°C 22.5mm +80°C 70.4mm 85.00 x 22.50 x 70.40 mm -
N° de stock RS 801-6296
Référence fabricant2810625
213,55 €
Each
Unité
5:1 - - - 19.2 → 253 V ac/dc 5A 0 → 20 mA 104mm -20°C 22.5mm +65°C 114.5mm - -
N° de stock RS 337-2752
Référence fabricant2814744
341,14 €
Each
Unité
55:1 - - - 20 → 30 V dc 55A 0 → 20 mA 99mm -20°C 22.5mm +60°C 114.5mm - -
N° de stock RS 174-3482
Référence fabricant2906231
342,68 €
Each
Unité
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
N° de stock RS 175-0491
Référence fabricant2906235
342,68 €
Each
Unité
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
N° de stock RS 174-3479
Référence fabricant2910325
293,74 €
Each
Unité
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
Nouveau
N° de stock RS 207-4842
Référence fabricant1058044
501,23 €
Each
Unité
- - 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 - - - -