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 446-0563
Référence fabricantAKR 5 B420L
MarqueLEM
354,05 €
Each
Unité
5:1 21.7mm - - 24 V dc, 150 V ac 5A 4 → 20 mA 57.2mm -20°C 89.7mm +50°C 30mm - -
N° de stock RS 106-8532
Référence fabricant56100C
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 715-7061
Référence fabricant56100C
1,38 €
Each
Unité
10:1 - - - - 10A - - -40°C - +85°C - 16.79 x 8.89 x 20.19 mm -
N° de stock RS 881-7910
Référence fabricantCTPROXT100
MarqueABB
31,03 €
Each
Unité
- 18mm - - - - - - -5°C - +50°C - 45 x 96 x 69 mm -
N° de stock RS 123-9539
Référence fabricant7KT1200
MarqueSiemens
146,70 €
Each
Unité
60:5 13mm Straight Through - - 60A 5 A - - - - - 105 x 71 x 90 mm -
N° de stock RS 435-8628
Référence fabricantHX 03-P
MarqueLEM
10,89 €
Each
Unité
9:1 0.6mm - Open Loop ±15 V 9A - 20mm -25°C 19mm +85°C 15.4mm - -
N° de stock RS 198-778
Référence fabricantAT 20 B420L
MarqueLEM
69,27 €
Each
Unité
20:1 16mm - - 20 → 30 V dc 20A 4 → 20 mA 67mm -20°C 44.5mm +60°C 36.5mm - -
N° de stock RS 180-7357
Référence fabricantLA 55-P
MarqueLEM
22,69 €
Each
Unité
70:1 - - Closed Loop 12 → 15 V 70A 50 mArms 27.6mm -40°C 36.6mm +85°C 14.45mm - -
N° de stock RS 801-6283
Référence fabricant2308043
232,43 €
Each
Unité
300:1 32mm - - 24 V dc 300A 4 → 20 mA 33.8mm -40°C 90mm +65°C 85mm - -
N° de stock RS 731-5267
Référence fabricantHTA 200-S
MarqueLEM
57,72 €
Each
Unité
200:1 32mm - Open Loop ±15 V 200A - 70mm -25°C 90mm +85°C 27.5mm - -
N° de stock RS 497-277
Référence fabricantHTR 100-SB
MarqueLEM
115,37 €
Each
Unité
200:1 21mm - Open Loop 12 → 15 V 200A - 69mm -10°C 46mm +70°C 21.5mm - -
N° de stock RS 715-7970
Référence fabricant2308027
211,21 €
Each
Unité
100:1 32mm - - 20 → 30 V dc 100A 4 → 20 mA 70mm -40°C 90mm +65°C 33.8mm - -
N° de stock RS 521-986
Référence fabricantHAT 1500-S
MarqueLEM
55,60 €
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 301-9495
Référence fabricantHAS 100S
MarqueLEM
23,90 €
Each
Unité
300:1 20.4 x 10.4mm - Open Loop 15 V 300A - 30mm -10°C 40mm +80°C 30mm - -
N° de stock RS 527-8545
Référence fabricantDHR 300 C10
MarqueLEM
237,34 €
Each
Unité
300:1 32mm - Open Loop 20 → 50 V dc 300A - 70mm -40°C 90mm +70°C 25mm - -
N° de stock RS 497-182
Référence fabricantHASS 50-S
MarqueLEM
17,18 €
Each
Unité
150:1 20.4 x 10.4mm - Open Loop 5 V 150A - 30mm -40°C 40mm +85°C 30mm - -
N° de stock RS 537-4485
Référence fabricantAC-1005
3,16 €
Each (In a Pack of 5)
Unité
5:1 - - - - 5A - - -40°C - +120°C - 23.8 x 23.8 x 11.12 mm -
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 179-6667
Référence fabricantLA 100-P
MarqueLEM
26,32 €
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 331-351
Référence fabricantCT132M60/5-1.5/1
MarqueHOBUT
14,09 €
Each
Unité
60:5 21mm DIN Rail Mounted - - - - 65mm -30°C 45mm +85°C 30mm - -