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 399-7244
Référence fabricantASM-010
4,26 €
Each
Unité
10:1 - - - - 10A - - -40°C - +120°C - 20.4 x 17.2 x 9.53 mm -
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 331-351
Référence fabricantCT132M60/5-1.5/1
MarqueHOBUT
14,37 €
Each
Unité
60:5 21mm DIN Rail Mounted - - - - 65mm -30°C 45mm +85°C 30mm - -
N° de stock RS 666-8208
Référence fabricantCKSR 6-NP
MarqueLEM
11,94 €
Each
Unité
6:1 - - Closed Loop 5.25 V 6A - 16.5mm -40°C 21.91mm +105°C 13.4mm - -
N° de stock RS 179-6667
Référence fabricantLA 100-P
MarqueLEM
25,36 €
Each
Unité
150:1 12.7 x 7mm - Closed Loop 12 → 15 V 150A 50 mArms 27.6mm -40°C 36.5mm +85°C 14.45mm - -
N° de stock RS 331-480
Référence fabricantCTSCM40600/5-5/1
MarqueHOBUT
50,20 €
Each
Unité
600:5 - Clip Fit - - 600A 5 A 104.5mm -30°C 116mm +80°C 35.5mm - -
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 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 913-9734
Référence fabricantMETSECT5CC013
33,64 €
Each
Unité
125:5 21mm Toroidal Ring - - - - - -25°C - +60°C - 65 x 44 x 30 mm -
N° de stock RS 499-5378
Référence fabricantLTSR 25-NP
MarqueLEM
15,17 €
Each
Unité
80:1 3.2mm - Closed Loop 5 V 80A - 24mm -40°C 22.2mm +85°C 10mm - -
N° de stock RS 497-192
Référence fabricantHASS 200-S
MarqueLEM
16,39 €
Each
Unité
600:1 20.4 x 10.4mm - Open Loop 5 V 600A - 30mm -40°C 40mm +85°C 30mm - -
N° de stock RS 331-519
Référence fabricantCT143M100/5-2.5/1-001
MarqueHOBUT
15,77 €
Each
Unité
100:5 24mm DIN Rail Mounted - - 100A 5 A 70mm -30°C 49mm +85°C 45mm - -
N° de stock RS 400-8575
Référence fabricantAS-100
3,72 €
Each
Unité
15:1 - - - - 15A - - -40°C - +120°C - 17.2 x 20.4 x 9.53 mm -
N° de stock RS 871-1626
Référence fabricantB82801B0803A020
MarqueEPCOS
2,263 €
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 881-8008
Référence fabricantCTMAX1000SELV
MarqueABB
51,51 €
Each
Unité
- 30mm - - - - - - -5°C - +50°C - 70 x 111 x 69 mm -
N° de stock RS 715-7071
Référence fabricant56T200C
1,37 €
Each
Unité
10:1 - - - - 10A - - -40°C - +85°C - 16.79 x 8.89 x 20.19 mm -
N° de stock RS 451-1368
Référence fabricantLF 305S
MarqueLEM
67,93 €
Each
Unité
300:1 20.1mm - Closed Loop 12 → 20 V 300A 150 mArms 56.5mm -40°C 60mm +85°C 26.6mm - -
N° de stock RS 666-8172
Référence fabricantCAS 6-NP
MarqueLEM
11,28 €
Each
Unité
6:1 - - Closed Loop 5.25 V 6A - 16.5mm -40°C 21.91mm +85°C 13.4mm - -
N° de stock RS 914-5310
Référence fabricantCT132TRAN10A-5/10V
MarqueHOBUT
37,86 €
Each
Unité
10:1 21mm - - 15 → 30 V 10A - 65mm -15°C 45mm +50°C 30mm - -
N° de stock RS 533-0637
Référence fabricantCTSCM40-100/5
MarqueHOBUT
48,46 €
Each
Unité
100:5 - Clip Fit - - - - 104.5mm -30°C 116mm +80°C 35.5mm - -