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 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 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 397-9117
Référence fabricantBZCT035
33,61 €
Each
Unité
- 35mm - - - - - 74mm -20°C 64mm +60°C 40mm - Broyce Type A Earth Leakage Relays
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 286-361
Référence fabricantLV 25-P
MarqueLEM
64,74 €
Each
Unité
14:1 - - Closed Loop 12 → 15 V 14A 25 mA 16.45mm 0°C 26mm +70°C 29.2mm - -
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 537-4542
Référence fabricantAC-1050
3,82 €
Each
Unité
50:1 - - - - 50A - - -40°C - +120°C - 34.9 x 14.3 x 34.9 mm -
N° de stock RS 301-9473
Référence fabricantLTS 25NP
MarqueLEM
14,10 €
Each
Unité
80:1 3.2mm - Closed Loop 5 V 80A - 24mm -40°C 22.2mm +85°C 10mm - -
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 668-4055
Référence fabricantCT105F150/5-2.5/1
MarqueHOBUT
40,72 €
Each
Unité
150:5 21mm Base Mounted - - - - 79mm -30°C 105mm +80°C 53mm - -
N° de stock RS 497-192
Référence fabricantHASS 200-S
MarqueLEM
17,18 €
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 668-4064
Référence fabricantCT105F200/5-2.5/1
MarqueHOBUT
42,43 €
Each
Unité
200:5 21mm Base Mounted - - - - 79mm -30°C 105mm +80°C 53mm - -
N° de stock RS 499-5536
Référence fabricantAP 50 B10
MarqueLEM
113,62 €
Each
Unité
50:1 18mm - Closed Loop 24 V dc 50A - 69mm -20°C 67mm +60°C 55mm - -
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 537-4491
Référence fabricantAC-1010
3,16 €
Each (In a Pack of 5)
Unité
10:1 - - - - 10A - - -40°C - +120°C - 23.8 x 23.8 x 11.12 mm -
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 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 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 - -