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 833-2752
Référence fabricantDM2T0200
MarqueLovato
18,18 €
Each
Unité
200:5 23mm Base Mounted - - - - 65.5mm -25°C 52mm +50°C 46.5mm - -
N° de stock RS 138-3461
Référence fabricantHO 10-P/SP33-1000
MarqueLEM
9,08 €
Each
Unité
25:1 8 x 8mm - Open Loop 3.14 → 3.46 V 25A Maximum of 25 mA 20.9mm -40°C 23.94mm +105°C 12mm - -
N° de stock RS 499-5435
Référence fabricantHTB 50-P
MarqueLEM
18,27 €
Each
Unité
150:1 16mm - Open Loop 12 → 15 V 150A - 34mm -20°C 39mm +80°C 14mm - -
N° de stock RS 175-6146
Référence fabricant4NC5122-0DE21
MarqueSiemens
74,88 €
Each
Unité
200:1 20mm Window - - 200A 1 A 65.6mm -30°C 60mm +55°C 75.3mm 60 x 75.3 x 65.6 mm Sentron Power Monitoring Devices
N° de stock RS 169-7681
Référence fabricantCSNE151-104
MarqueHoneywell
12,448 €
Each (In a Box of 40)
Unité
56:1 - - Closed Loop 15 V dc 56A 12.5 mA 20.3mm -40°C 31.75mm +75°C 12.7mm - -
N° de stock RS 181-2135
Référence fabricantCSLA2DG
MarqueHoneywell
29,46 €
Each
Unité
- 15.7mm - Open Loop 6 → 12 V dc - - - - - - - - -
N° de stock RS 171-8851
MarqueRS PRO
47,09 €
Each
Unité
400:5 33 x 23mm Base Mounted - - 400A 5 A 106mm +20°C 93mm +70°C 40mm 93 x 40 x 106 mm -
N° de stock RS 527-8523
Référence fabricantDHR 100 C10
MarqueLEM
207,64 €
Each
Unité
100:1 32mm - Open Loop 20 → 50 V dc 100A - 70mm -40°C 90mm +70°C 25mm - -
N° de stock RS 171-8827
MarqueRS PRO
25,82 €
Each
Unité
160:5 35mm Base Mounted - - 160A 5 A 87.5mm - 105mm - 38mm 105 x 38 x 87.5 mm MCCB
N° de stock RS 170-9247
Référence fabricant53030C
0,59 €
Each (On a Reel of 1000)
Unité
10:1 - - - - 10A - - -40°C - +125°C - 8.3 x 7.2 x 5.4 mm -
N° de stock RS 123-9532
Référence fabricant4NC5328-2CE20
MarqueSiemens
86,31 €
Each
Unité
750:5 36mm Window - - 750A 5 A - -10°C - 55°C - 82.5 x 80 x 98 mm Measuring Devices
N° de stock RS 715-7074
Référence fabricant56300C
1,37 €
Each
Unité
10:1 - - - - 10A - - -40°C - +85°C - 16.79 x 8.89 x 20.19 mm -
N° de stock RS 200-3798
Référence fabricantHLSR 120-P/SP10
MarqueLEM
9,89 €
Each
Unité
120:1 - - Open Loop +5 V 120A - - - - - - - -
N° de stock RS 122-0566
Référence fabricant49506080
MarqueSocomec
85,31 €
Each
Unité
160:5 80mm - - - 160A 5 A - -40°C - 80°C - 116 x 26 x 125 mm DIRIS A80, RESYS
N° de stock RS 177-4929
Référence fabricantATO-100-B333-D16
MarqueLEM
54,57 €
Each
Unité
100:1 16mm Split Core - - 100A - 56.1mm -10°C 40.8mm +55°C 33.2mm - -
N° de stock RS 886-2159
Référence fabricantXM13-315081S000000
15,21 €
Each
Unité
400:5 40mm Base Mounted - - - - - - - - - 62 x 40 x 78 mm -
N° de stock RS 198-4506
Référence fabricantMETSECT5MC080
120,39 €
Each
Unité
800:5 32mm Tropicalise - - 800A 5 A 95mm -25°C 70mm +60°C 65mm - -
N° de stock RS 321-6286
Référence fabricantLAH25-NP
MarqueLEM
18,51 €
Each
Unité
25:1 - - Closed Loop 12 → 15 V 25A 25 mArms 21mm -25°C 33.3mm +85°C 14.93mm - -
Nouveau
N° de stock RS 217-6208
Référence fabricantTDGE2
MarqueIME
110,60 €
Each
Unité
1/700 140mm - - 720 V 700A 1 A 140mm - 140mm - - - -
N° de stock RS 123-6726
Référence fabricantXN45-325051S000000
31,03 €
Each
Unité
500:5 31mm Base Mounted - - 500A 5 A - - - - - 141 x 38 x 102.5 mm MCCB