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 175-6156
Référence fabricant4NC5125-2FE21
MarqueSiemens
70,56 €
Each
Unité
300:5 - Window - - 300A 5 A 65.6mm -30°C 60mm +55°C 75.3mm 60 x 75.3 x 65.6 mm Sentron Power Monitoring Devices
Nouveau
N° de stock RS 221-0449
Référence fabricant49506050
MarqueSocomec
65,59 €
Each
Unité
- 50mm - - 720 V ac 10A - 125mm - 102.5mm - - - -
N° de stock RS 181-0079
Référence fabricantMR-3
MarqueKEMET
7,50 €
Each
Unité
- 11mm - - - - - - - - - - - -
N° de stock RS 200-3803
Référence fabricantLES 6-NP
MarqueLEM
11,28 €
Each
Unité
6:1 - - Closed Loop +5 V 6A - - - - - - - -
N° de stock RS 871-1613
Référence fabricantB82801B0205A100
MarqueEPCOS
1,427 €
Each (In a Bag of 3)
Unité
20:1 - - - - 20A - - -40°C - +125°C - 8.13 x 7.11 x 5.08 mm -
N° de stock RS 177-4924
Référence fabricantATO-16-B333-D10
MarqueLEM
43,56 €
Each
Unité
16:1 10mm Split Core - - 16A - 45.5mm -10°C 33.5mm +55°C 32mm - -
N° de stock RS 124-3882
MarqueRS PRO
3,60 €
Each
Unité
10:1 5mm - - - 10A - - -40°C - +120°C - 17.2 x 9.53 x 20.4 mm -
N° de stock RS 198-4508
Référence fabricantMETSECT5MD060
113,53 €
Each
Unité
600:5 40mm Tropicalise - - 600A 5 A 95mm -25°C 70mm +60°C 65mm - -
N° de stock RS 451-1396
Référence fabricantLF 1005S
MarqueLEM
185,13 €
Each
Unité
1500:1 40.5mm - Closed Loop 15 → 24 V 1500A 200 mArms 95mm -40°C 110mm +85°C 34.3mm - -
N° de stock RS 171-8783
MarqueRS PRO
18,99 €
Each
Unité
150:5 30 x 11mm Clip Fit - - 150A 5 A 78mm -5°C 62mm +55°C 40mm 62 x 40 x 78 mm -
N° de stock RS 171-8753
MarqueRS PRO
12,01 €
Each
Unité
80:5 21 x 10mm Clip Fit - - 80A 5 A 65mm -5°C 45mm +55°C 40mm 45 x 40 x 65 mm -
N° de stock RS 171-8786
MarqueRS PRO
14,28 €
Each
Unité
150:5 40 x 11mm Clip Fit - - 150A 5 A 78mm -5°C 62mm +55°C 40mm 62 x 40 x 78 mm -
Nouveau
N° de stock RS 216-9749
Référence fabricantCAS5025SRA-LI
MarqueSensitec
11,907 €
Each (In a Tray of 350)
Unité
0.625694444 1mm - - 5 V 25A - 23mm - 22.9mm - - - -
N° de stock RS 198-4478
Référence fabricantMETSECT5DC200
223,75 €
Each
Unité
2000:5 - Tropicalise - - 2000A 5 A 160mm -25°C 125mm +50°C 87mm - -
Nouveau
N° de stock RS 221-0305
Référence fabricant192T2022
MarqueSocomec
27,29 €
Each
Unité
100:5 22.5mm - - - 100A - 65mm - 49.5mm - - - -
N° de stock RS 171-8749
MarqueRS PRO
17,47 €
Each
Unité
50:1 21 x 10mm - - - - - 65mm - 45mm - 40mm 45 x 40 x 65 mm -
N° de stock RS 881-8001
Référence fabricant2CSG226035R1101 CT MAX 600 SELV
MarqueABB
53,60 €
Each
Unité
- 30mm - - - - - - -5°C - +50°C - 70 x 111 x 69 mm -
N° de stock RS 121-8174
Référence fabricantCSLW6B200M
MarqueHoneywell
19,02 €
Each
Unité
9:1 - - - 4.5 → 10.5 V dc 9A -200 → +200 mA 10mm -25°C 16.2mm +100°C - - -
N° de stock RS 777-7170
Référence fabricant17H7NNJN3
MarqueGIC
84,58 €
Each
Unité
- 92mm Base Mounted, DIN Rail Mounted - - - - 132mm -15°C 20mm 60°C 155mm - -
N° de stock RS 171-8766
MarqueRS PRO
10,49 €
Each
Unité
125:5 30 x 10mm Clip Fit - - 125A 5 A 70mm -5°C 50mm +55°C 31mm 50 x 31 x 70 mm -