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 793-4593
Référence fabricantHLSR 50-P
MarqueLEM
7,21 €
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 286-361
Référence fabricantLV 25-P
MarqueLEM
62,37 €
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 668-4064
Référence fabricantCT105F200/5-2.5/1
MarqueHOBUT
43,28 €
Each
Unité
200:5 21mm Base Mounted - - - - 79mm -30°C 105mm +80°C 53mm - -
N° de stock RS 537-4491
Référence fabricantAC-1010
3,224 €
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 301-9473
Référence fabricantLTS 25NP
MarqueLEM
14,37 €
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 331-480
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 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 499-5536
Référence fabricantAP 50 B10
MarqueLEM
115,50 €
Each
Unité
50:1 18mm - Closed Loop 24 V dc 50A - 69mm -20°C 67mm +60°C 55mm - -
N° de stock RS 399-7317
Référence fabricantAS-103
1,79 €
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
41,53 €
Each
Unité
150:5 21mm Base Mounted - - - - 79mm -30°C 105mm +80°C 53mm - -
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 321-6292
Référence fabricantLAH 50-P
MarqueLEM
17,93 €
Each
Unité
50:1 - - Closed Loop 12 → 15 V 50A 25 mArms 21mm -25°C 33.3mm +85°C 14.93mm - -
N° de stock RS 532-9198
Référence fabricantHAIS 50-P
MarqueLEM
19,31 €
Each
Unité
150:1 15 x 8mm - Open Loop 5 V 150A - 29.5mm -40°C 33mm +85°C 14mm - -
N° de stock RS 801-6255
Référence fabricant2813457
214,54 €
Each
Unité
100:1 18.5mm - - 20 → 30 V dc 100A - 85mm -20°C 55mm +60°C 70.5mm - -
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 337-2746
Référence fabricant2814728
296,77 €
Each
Unité
55:1 - - - 20 → 30 V dc 55A 0 → 20 mA 99mm -20°C 22.5mm +60°C 114.5mm - -
N° de stock RS 914-5288
Référence fabricantCT132TRAN100A-4/20MA
MarqueHOBUT
49,53 €
Each
Unité
100:1 21mm - - 15 → 30 V 100A 4 → 20 mA 65mm -15°C 45mm +50°C 30mm - -
N° de stock RS 775-4959
Référence fabricantAP-2500
3,97 €
Each
Unité
15:1 - - - - 15A - - -40°C - +85°C - 17.2 x 9.53 x 20.4 mm -
N° de stock RS 173-0161
Référence fabricantAP-2500
3,223 €
Each (In a Box of 250)
Unité
15:1 - - - - 15A - - -40°C - +85°C - 17.2 x 9.53 x 20.4 mm -