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 206-2397
Référence fabricantHAL 100-S
MarqueLEM
48,88 €
Each
Unité
300:1 20 x 15mm - Open Loop 15 V 300A - 41mm -25°C 41.27mm +85°C 31.3mm - -
N° de stock RS 331-480
Référence fabricantCTSCM40600/5-5/1
MarqueHOBUT
49,22 €
Each
Unité
600:5 - Clip Fit - - 600A 5 A 104.5mm -30°C 116mm +80°C 35.5mm - -
N° de stock RS 198-835
Référence fabricantAT 20 B10
MarqueLEM
53,85 €
Each
Unité
20:1 16mm - - - 20A - 67mm -20°C 44.5mm +60°C 36.5mm - -
N° de stock RS 793-4593
Référence fabricantHLSR 50-P
MarqueLEM
7,50 €
Each
Unité
125:1 - - Open Loop 4.5 → 5.5 V 125A 50 A 12mm -40°C 17.2mm +105°C 21mm - -
N° de stock RS 173-0057
Référence fabricantAX-1000
2,736 €
Each (In a Box of 250)
Unité
10:1 - - - - 10A - - -40°C - +120°C - 12.7 x 17 x 9.53 mm -
N° de stock RS 666-8208
Référence fabricantCKSR 6-NP
MarqueLEM
12,34 €
Each
Unité
6:1 - - Closed Loop 5.25 V 6A - 16.5mm -40°C 21.91mm +105°C 13.4mm - -
N° de stock RS 106-8537
Référence fabricant56T100C
1,352 €
Each (In a Tube of 25)
Unité
10:1 - - - - 10A - - -40°C - +85°C - 16.79 x 8.89 x 20.19 mm -
N° de stock RS 793-4632
Référence fabricantATO-75BILD10
MarqueLEM
32,07 €
Each
Unité
90:1 10mm - - - 90A 90 mA 48.5mm -25°C 33.5mm +70°C 32mm - -
N° de stock RS 715-7077
Référence fabricant56T100C
1,38 €
Each
Unité
10:1 - - - - 10A - - -40°C - +85°C - 16.79 x 8.89 x 20.19 mm -
N° de stock RS 521-992
Référence fabricantLF 205-S/SP3
MarqueLEM
60,14 €
Each
Unité
200:1 15.5mm - Closed Loop 12 → 15 V 200A 100 mArms 51.63mm -40°C 61mm +85°C 26.19mm - -
N° de stock RS 331-345
Référence fabricantCT132M80/5-1.5/1
MarqueHOBUT
14,43 €
Each
Unité
80:5 21mm DIN Rail Mounted - - 80A 5 A 65mm -30°C 45mm +85°C 30mm - -
N° de stock RS 913-9731
Référence fabricantMETSECT5CC005
29,82 €
Each
Unité
50:5 21mm Toroidal Ring - - - - - -25°C - +60°C - 65 x 44 x 30 mm -
N° de stock RS 321-6292
Référence fabricantLAH 50-P
MarqueLEM
18,82 €
Each
Unité
50:1 - - Closed Loop 12 → 15 V 50A 25 mArms 21mm -25°C 33.3mm +85°C 14.93mm - -
N° de stock RS 914-5288
Référence fabricantCT132TRAN100A-4/20MA
MarqueHOBUT
48,56 €
Each
Unité
100:1 21mm - - 15 → 30 V 100A 4 → 20 mA 65mm -15°C 45mm +50°C 30mm - -
N° de stock RS 914-5290
Référence fabricantCTSCMWH30/0.333V
MarqueHOBUT
21,71 €
Each
Unité
30:1 10mm Split Core - - 30A 333 mV - -15°C - +50°C - 28.7 x 26.4 x 41.7 mm Multi Function Meter
N° de stock RS 162-0292
Référence fabricantB82801B0803A020
MarqueEPCOS
1,10 €
Each (On a Reel of 900)
Unité
20:1 - - - - 20A - - -40°C - +125°C - 8.13 x 7.11 x 5.08 mm -
N° de stock RS 729-5520
Référence fabricantAC-1200
8,05 €
Each
Unité
200:1 - - - - 200A - - -40°C - +120°C - 55.6 x 20.6 x 55.6 mm -
N° de stock RS 522-068
Référence fabricantHAT 1000-S
MarqueLEM
53,00 €
Each
Unité
2500:1 40.5 x 30.5mm - Open Loop 15 V 2500A - 65mm -10°C 90mm +80°C 37mm - -
N° de stock RS 886-2162
Référence fabricantXM19-285111S000000
26,37 €
Each
Unité
300:5 50mm Base Mounted - - - - - - - - - 86 x 45 x 110 mm -
N° de stock RS 914-5294
Référence fabricantCTSCMWH60/0.333V
MarqueHOBUT
21,71 €
Each
Unité
60:1 10mm Split Core - - 60A 333 mV - -15°C - +50°C - 28.7 x 26.4 x 41.7 mm Multi Function Meter