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 497-198
Référence fabricantHASS 100-S
MarqueLEM
16,39 €
Each
Unité
300:1 20.4 x 10.4mm - Open Loop 5 V 300A - 30mm -40°C 40mm +85°C 30mm - -
N° de stock RS 532-9097
Référence fabricantHXS 20-NP
MarqueLEM
8,64 €
Each
Unité
60:1 - - Open Loop 5 V 60A - 10.7mm -40°C 16.7mm +105°C 18.7mm - -
N° de stock RS 775-4909
Référence fabricantAZ-0500
4,99 €
Each
Unité
500:1 - - - - 25A - - -40°C - +85°C - 19.0 x 11.5 x 21.5 mm -
N° de stock RS 919-4690
Référence fabricantLF 310-S
MarqueLEM
83,22 €
Each
Unité
500:1 - - Closed Loop ±11.4 → ±21 V 500A ±0.25 A 56.4mm -40°C 68mm +85°C 26.3mm - -
N° de stock RS 331-597
Référence fabricantCT132M40/5-1/3
MarqueHOBUT
14,37 €
Each
Unité
40:5 21mm DIN Rail Mounted - - 40A 5 A 65mm -30°C 45mm +85°C 30mm - -
N° de stock RS 257-802
Référence fabricantCT173M150/5-2.5/1-001
MarqueHOBUT
16,49 €
Each
Unité
150:5 40mm Base Mounted - - 150A 5 A 95mm -30°C 70mm +85°C 55mm - -
N° de stock RS 533-0643
Référence fabricantCTSCM40-200/5
MarqueHOBUT
48,46 €
Each
Unité
200:5 - Clip Fit - - - - 104.5mm -30°C 116mm +80°C 35.5mm - -
N° de stock RS 198-841
Référence fabricantAT 5 B5
MarqueLEM
54,29 €
Each
Unité
5:1 16mm - - - 5A - 67mm -20°C 44.5mm +60°C 36.5mm - -
N° de stock RS 537-4508
Référence fabricantAC-1015
5,272 €
Each (In a Pack of 5)
Unité
15:1 - - - - 15A - - -40°C - +120°C - 23.8 x 23.8 x 11.12 mm -
N° de stock RS 313-839
Référence fabricantCT173M120/5-2.5/1-002
MarqueHOBUT
16,20 €
Each
Unité
120:5 40mm Base Mounted - - 120A 5 A 95mm -30°C 70mm +85°C 55mm - -
N° de stock RS 331-474
Référence fabricantCT132M50/5-1/1
MarqueHOBUT
14,37 €
Each
Unité
50:5 21mm DIN Rail Mounted - - 50A 5 A 65mm -30°C 45mm +85°C 30mm - -
N° de stock RS 499-5362
Référence fabricantLTSR 15-NP
MarqueLEM
15,00 €
Each
Unité
48:1 3.2mm - Closed Loop 5 V 48A - 24mm -40°C 22.2mm +85°C 10mm - -
N° de stock RS 497-209
Référence fabricantAT 50 B420L
MarqueLEM
83,77 €
Each
Unité
50:1 16mm - - 20 → 30 V dc 50A 4 → 20 mA 67mm -20°C 44.5mm +60°C 36.5mm - -
N° de stock RS 435-8628
Référence fabricantHX 03-P
MarqueLEM
11,11 €
Each
Unité
9:1 0.6mm - Open Loop ±15 V 9A - 20mm -25°C 19mm +85°C 15.4mm - -
N° de stock RS 180-7357
Référence fabricantLA 55-P
MarqueLEM
21,89 €
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 497-388
Référence fabricantAT 150 B420
MarqueLEM
102,36 €
Each
Unité
150:1 16mm - - 20 → 30 V dc 150A 4 → 20 mA 67mm -20°C 44.5mm +60°C 36.5mm - -
N° de stock RS 497-164
Référence fabricantCT 0.4P
MarqueLEM
72,07 €
Each
Unité
800:1 11mm - - 15 V 800A - 30mm -20°C 30mm +85°C 20mm - -
N° de stock RS 666-8182
Référence fabricantCASR 6-NP
MarqueLEM
11,94 €
Each
Unité
6:1 - - Closed Loop 5.25 V 6A - 16.5mm -40°C 21.91mm +85°C 13.4mm - -
N° de stock RS 173-0067
Référence fabricantAZ-0750
3,967 €
Each (In a Box of 84)
Unité
40:1 - - - - 40A - - -40°C - +85°C - 19.0 x 11.5 x 21.5 mm -
N° de stock RS 446-0563
Référence fabricantAKR 5 B420L
MarqueLEM
379,50 €
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 - -