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 775-4912
Référence fabricantAZ-1000
5,27 €
Each
Unité
50:1 - - - - 50A - - -40°C - +85°C - 19.0 x 11.5 x 21.5 mm -
N° de stock RS 173-0068
Référence fabricantAZ-1000
4,267 €
Each (In a Box of 84)
Unité
50:1 - - - - 50A - - -40°C - +85°C - 19.0 x 11.5 x 21.5 mm -
N° de stock RS 715-7989
Référence fabricant2308030
211,21 €
Each
Unité
200:1 32mm - - 20 → 30 V dc 200A 4 → 20 mA 70mm -40°C 90mm +65°C 33.8mm - -
N° de stock RS 173-0049
Référence fabricantAC-1030
2,973 €
Each (In a Box of 120)
Unité
30:1 - - - - 30A - - -40°C - +120°C - 30.2 x 14.3 x 30.2 mm -
N° de stock RS 207-2877
Référence fabricantHTA 100-S
MarqueLEM
57,72 €
Each
Unité
300:1 32mm - Open Loop 15 V 300A - 70mm -25°C 90mm +85°C 27.5mm - -
N° de stock RS 729-5501
Référence fabricantAC-1030
3,72 €
Each
Unité
30:1 - - - - 30A - - -40°C - +120°C - 30.2 x 14.3 x 30.2 mm -
N° de stock RS 521-936
Référence fabricantHASS 400-S
MarqueLEM
18,15 €
Each
Unité
900:1 20.4 x 10.4mm - Open Loop 5 V 900A - 30mm -40°C 40mm +85°C 30mm - -
N° de stock RS 499-5356
Référence fabricantLTSR 6-NP
MarqueLEM
14,82 €
Each
Unité
19.2:1 3.2mm - Closed Loop 5 V 19.2A - 24mm -40°C 22.2mm +85°C 10mm - -
N° de stock RS 451-1374
Référence fabricantLF 306S
MarqueLEM
90,69 €
Each
Unité
500:1 25.5mm - Closed Loop 12 → 15 V 500A 150 mArms 57.4mm -25°C 67.3mm +70°C 15.7mm - -
N° de stock RS 819-9779
Référence fabricant90AS
MarqueEfergy
11,00 €
Each
Unité
- 12mm Split Core - - - - - - - - - - Data Loggers/DAS, Digital or Analog Meters, DMMs, Recorders
N° de stock RS 286-311
Référence fabricantLA 25-NP
MarqueLEM
22,57 €
Each
Unité
36:1 - - Closed Loop 15 V 36A 25 mArms 16.45mm -40°C 26mm +85°C 29.2mm - -
N° de stock RS 436-2330
Référence fabricantLTS 6NP
MarqueLEM
14,10 €
Each
Unité
19.2:1 3.2mm - Closed Loop 5 V 19.2A - 24mm -40°C 22.2mm +85°C 10mm - -
N° de stock RS 775-2714
Référence fabricantCTSCMICRO19-200/5-T-S
MarqueHOBUT
50,06 €
Each
Unité
200:5 - Split Core - - - - 78mm -30°C 58mm +55°C 49mm - -
N° de stock RS 499-5586
Référence fabricantAP 200 B420L
MarqueLEM
126,20 €
Each
Unité
200:1 18mm - - 12 → 24 V dc 200A 4 → 20 mA 69mm -20°C 67mm +60°C 55mm - -
N° de stock RS 527-8602
Référence fabricantDHR 1000 C420
MarqueLEM
266,99 €
Each
Unité
1000:1 32mm - Open Loop 20 → 50 V dc 1000A 4 → 20 mA 70mm -40°C 90mm +70°C 25mm - -
N° de stock RS 173-0066
Référence fabricantAZ-0500
3,972 €
Each (In a Box of 84)
Unité
25:1 - - - - 25A - - -40°C - +85°C - 19.0 x 11.5 x 21.5 mm -
N° de stock RS 499-5570
Référence fabricantAP 100 B420L
MarqueLEM
126,20 €
Each
Unité
100:1 18mm - - 12 → 24 V dc 100A 4 → 20 mA 69mm -20°C 67mm +60°C 55mm - -
N° de stock RS 537-4536
Référence fabricantAC-1040
3,82 €
Each
Unité
40:1 - - - - 40A - - -40°C - +120°C - 34.9 x 14.3 x 34.9 mm -
N° de stock RS 499-5564
Référence fabricantAP 50 B420L
MarqueLEM
126,20 €
Each
Unité
50:1 18mm - - 12 → 24 V dc 50A 4 → 20 mA 69mm -20°C 67mm +60°C 55mm - -
N° de stock RS 497-198
Référence fabricantHASS 100-S
MarqueLEM
17,18 €
Each
Unité
300:1 20.4 x 10.4mm - Open Loop 5 V 300A - 30mm -40°C 40mm +85°C 30mm - -