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 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 881-7938
Référence fabricantCTPROXT400
MarqueABB
46,80 €
Each
Unité
- 18mm - - - - - - -5°C - +50°C - 45 x 96 x 69 mm -
N° de stock RS 257-830
Référence fabricantCT173M400/5-2.5/1-002
MarqueHOBUT
16,49 €
Each
Unité
400:5 40mm Base Mounted - - 400A 5 A 95mm -30°C 70mm +85°C 55mm - -
N° de stock RS 124-3895
MarqueRS PRO
3,11 €
Each
Unité
1000:1 23.8mm - - - 200A - - -55°C - +130°C - 55.6 x 20.6 x 55.6 mm -
Nouveau
N° de stock RS 221-0308
Référence fabricant192T2025
MarqueSocomec
27,29 €
Each
Unité
250:5 22.5mm - - - 250A - 65mm - 49.5mm - - - -
N° de stock RS 171-8778
MarqueRS PRO
13,22 €
Each
Unité
500:5 30 x 10mm Clip Fit - - 500A 5 A 70mm -5°C 50mm +55°C 31mm 50 x 31 x 70 mm -
N° de stock RS 175-6122
Référence fabricant3UL2302-1A
MarqueSiemens
145,80 €
Each
Unité
40:1 - Toroidal Ring - - 40A 85 A 64mm -25°C 70mm +60°C 75.5mm 70 x 75.5 x 64 mm Fault Current Monitoring
N° de stock RS 200-3763
Référence fabricantDVL 500
MarqueLEM
203,94 €
Each
Unité
- - - Closed Loop ±24 V - -75 → 75 mA - - - - - - -
N° de stock RS 123-6731
Référence fabricantXS01-245051S 000000
38,79 €
Each
Unité
200:5 33 x 23mm Clip Fit - - - - - - - - - 93 x 40 x 106 mm -
Nouveau
N° de stock RS 221-0324
Référence fabricant192T2415
MarqueSocomec
33,53 €
Each
Unité
150:5 28mm - - - 150A - 70mm - 49.9mm - - - -
N° de stock RS 321-6286
Référence fabricantLAH25-NP
MarqueLEM
17,71 €
Each
Unité
25:1 - - Closed Loop 12 → 15 V 25A 25 mArms 21mm -25°C 33.3mm +85°C 14.93mm - -
N° de stock RS 522-018
Référence fabricantHAT 500-S
MarqueLEM
48,51 €
Each
Unité
1500:1 40.5 x 30.5mm - Open Loop 15 V 1500A - 65mm -10°C 90mm +80°C 37mm - -
N° de stock RS 198-4497
Référence fabricantMETSECT5MB025
88,20 €
Each
Unité
250:5 26mm Tropicalise - - 250A 5 A 85mm -25°C 60mm +60°C 63mm - -
Nouveau
N° de stock RS 210-0636
MarqueRS PRO
231,88 €
Each
Unité
- 13.8mm Solid Core - - 200A - 55.4mm -25°C 83.8mm +65°C 27mm - -
N° de stock RS 287-3210
Référence fabricantCT153M300/5-2.5/1
MarqueHOBUT
15,68 €
Each
Unité
300:5 26mm Straight Through - - - - 75mm -20°C 54.5mm +70°C 68mm - -
Nouveau
N° de stock RS 221-0301
Référence fabricant192T2012
MarqueSocomec
31,15 €
Each
Unité
125:5 21mm - - - 125A - 65mm - 45mm - - - -
N° de stock RS 174-3478
Référence fabricant2910326
317,31 €
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
N° de stock RS 198-4467
Référence fabricantMETSECT5DA080
120,39 €
Each
Unité
800:5 - Tropicalise - - 800A 5 A 94mm -25°C 90mm +60°C 87mm - -
N° de stock RS 123-6718
Référence fabricantXN35-205031S000000
26,37 €
Each
Unité
125:5 31mm Base Mounted - - 125A 5 A - - - - - 105 x 38 x 87.5 mm MCCB
N° de stock RS 886-2213
Référence fabricantXM20-425141S000000
28,55 €
Each
Unité
1500:5 60mm Base Mounted - - - - - - - - - 86 x 45 x 110 mm -
Nouveau
N° de stock RS 221-0411
Référence fabricant48290504
MarqueSocomec
49,28 €
Each
Unité
- - - - 300 V 160 → 630A - 86mm - 45mm - - - -