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 124-2471
Référence fabricantP01379608
292,51 €
1 Set
jeu(x)
600:1 36mm Split Core - - 600A 1 A - -20°C - +50°C - 57.1 x 40.2 x 91.4 mm ENERIUM Power Monitors, ULYS Submeters
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 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 167-0564
Référence fabricantB82801C2245A200
MarqueEPCOS
1,156 €
Each (On a Reel of 200)
Unité
40:1 - - - - 40A - - -40°C - +125°C - 14.22 x 13.46 x 10 mm -
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 532-9198
Référence fabricantHAIS 50-P
MarqueLEM
19,31 €
Each
Unité
150:1 15 x 8mm - Open Loop 5 V 150A - 29.5mm -40°C 33mm +85°C 14mm - -
N° de stock RS 123-6732
Référence fabricantXS01-275071S 000000
45,00 €
Each
Unité
250:5 - Base Mounted - - 250A 5 A - +20°C - +70°C - - -
N° de stock RS 793-4629
Référence fabricantCTSR 0.3-P
MarqueLEM
31,35 €
Each
Unité
21.6:1 20.3mm - - 4.75 → 5.25 V 21.6A 300 mA 44.6mm -40°C 41.35mm +105°C 17.9mm - -
N° de stock RS 871-1648
Référence fabricantB82801C2245A200
MarqueEPCOS
1,177 €
Each (In a Bag of 3)
Unité
40:1 - - - - 40A - - -40°C - +125°C - 14.22 x 13.46 x 10 mm -
N° de stock RS 919-4696
Référence fabricantLF 210-S
MarqueLEM
66,11 €
Each
Unité
420:1 - - Closed Loop ±11.4 → ±15.75 V 420A ±0.21 A 50.75mm -40°C 61mm +85°C 24.2mm - -
N° de stock RS 497-243
Référence fabricantAT 150 B10
MarqueLEM
83,77 €
Each
Unité
150:1 16mm - - - 150A - 67mm -20°C 44.5mm +60°C 36.5mm - -
N° de stock RS 399-7339
Référence fabricantAS-104
1,76 €
Each
Unité
15:1 - - - - 15A - - -40°C - +120°C - 17.2 x 20.4 x 9.53 mm -
N° de stock RS 331-604
Référence fabricantCTSCM40400/5-5/1
MarqueHOBUT
48,46 €
Each
Unité
400:5 - Clip Fit - - 400A 5 A 116mm -30°C 104.5mm +80°C 35.5mm - -
N° de stock RS 331-575
Référence fabricantCTSCM40500/5-5/1
MarqueHOBUT
49,22 €
Each
Unité
500:5 - Clip Fit - - 500A 5 A 116mm -30°C 104.5mm +80°C 35.5mm - -
N° de stock RS 497-338
Référence fabricantAT 100 B420
MarqueLEM
93,06 €
Each
Unité
100:1 16mm - - 20 → 30 V dc 100A 4 → 20 mA 67mm -20°C 44.5mm +60°C 36.5mm - -
N° de stock RS 881-7935
Référence fabricantCTPROXT300
MarqueABB
39,78 €
Each
Unité
- 18mm - - - - - - -5°C - +50°C - 45 x 96 x 69 mm -
N° de stock RS 729-5520
Référence fabricantAC-1200
8,21 €
Each
Unité
200:1 - - - - 200A - - -40°C - +120°C - 55.6 x 20.6 x 55.6 mm -
N° de stock RS 181-1429
Référence fabricantCSNT651
MarqueHoneywell
36,40 €
Each
Unité
150:1 12.5 x 9mm - Closed Loop 12 → 15 V dc 150A 25 mA 29.6mm -40°C 36.6mm +85°C 14.45mm - -
N° de stock RS 499-5485
Référence fabricantHTB 100-P
MarqueLEM
18,59 €
Each
Unité
300:1 16mm - Open Loop 12 → 15 V 300A - 34mm -20°C 39mm +80°C 14mm - -
N° de stock RS 914-5294
Référence fabricantCTSCMWH60/0.333V
MarqueHOBUT
22,14 €
Each
Unité
- 10mm Split Core - - 60A 333 mV - -15°C - +50°C - 28.7 x 26.4 x 41.7 mm Multi Function Meter