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 Price 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
RS Stock No. 532-9249
Mfr. Part No.HTFS 400-P/SP2
BrandLEM
TWD885.00
Each
units
600:1 22mm - Open Loop 5 V 600A - 46.3mm -40°C 40mm +105°C 17mm - -
RS Stock No. 715-7049
Mfr. Part No.53150C
TWD37.00
Each
units
10:1 - - - - 10A - - -40°C - +125°C - 8.3 x 7.2 x 5.4 mm -
RS Stock No. 435-8684
Mfr. Part No.HX 03-P/SP2
BrandLEM
TWD460.00
Each
units
9:1 0.6mm - Open Loop 12 → 15 V 9A - 20.5mm -25°C 19mm +85°C 15.4mm - -
RS Stock No. 123-6734
Mfr. Part No.XS02-285055S 000000
TWD1,670.00
Each
units
300:5 80 x 50mm Clip Fit - - - - - - - - - 125 x 40 x 158 mm -
RS Stock No. 446-0636
Mfr. Part No.DK 300 B420
BrandLEM
TWD15,761.00
Each
units
300:1 21.7mm - - 20 → 50 V dc, 22 → 38 V ac 300A 4 → 20 mA 57.2mm -20°C 89.7mm +50°C 30mm - -
RS Stock No. 106-8532
Mfr. Part No.56100C
TWD53.60
Each (In a Tube of 25)
units
10:1 - - - - 10A - - -40°C - +85°C - 16.79 x 8.89 x 20.19 mm -
RS Stock No. 715-7061
Mfr. Part No.56100C
TWD60.00
Each
units
10:1 - - - - 10A - - -40°C - +85°C - 16.79 x 8.89 x 20.19 mm -
RS Stock No. 857-7432
Mfr. Part No.E83-2050
TWD12,644.00
Each
units
100:1:30 mA 12mm Base Mounted - - - - 56mm -20°C 22.5mm +50°C 47.4mm 56 x 22.5 x 47.4 mm -
RS Stock No. 497-221
Mfr. Part No.LA 25-P
BrandLEM
TWD1,320.00
Each
units
55:1 - - Closed Loop 12 → 15 V 55A 25 mArms 27.2mm -25°C 36.5mm +85°C 14.45mm - -
RS Stock No. 451-1396
Mfr. Part No.LF 1005S
BrandLEM
TWD7,838.00
Each
units
1500:1 40.5mm - Closed Loop 15 → 24 V 1500A 200 mArms 95mm -40°C 110mm +85°C 34.3mm - -
RS Stock No. 173-0041
BrandRS PRO
TWD38.80
Each (In a Box of 351)
units
50:1 5mm - - - 15A - - -40°C - +120°C - 17.2 x 9.53 x 20.4 mm -
RS Stock No. 167-0564
Mfr. Part No.B82801C2245A200
BrandEPCOS
TWD69.90
Each (On a Reel of 200)
units
40:1 - - - - 40A - - -40°C - +125°C - 14.22 x 13.46 x 10 mm -
RS Stock No. 435-8640
Mfr. Part No.HX 10-P
BrandLEM
TWD432.00
Each
units
30:1 1.1mm - Open Loop 15 V 30A - 20mm -25°C 19mm +85°C 15.4mm - -
RS Stock No. 181-2129
Mfr. Part No.CSLA2CD
BrandHoneywell
TWD737.00
Each
units
- 10.9mm - Open Loop 6 → 12 V dc - - - - - - - - -
RS Stock No. 331-468
Mfr. Part No.CT132M120/5-2.5/1
BrandHOBUT
TWD527.00
Each
units
120:5 21mm DIN Rail Mounted - - 120A 5 A 65mm -30°C 45mm +85°C 30mm - -
RS Stock No. 729-5517
Mfr. Part No.AC-1100
TWD242.00
Each
units
100:1 - - - - 100A - - -40°C - +120°C - 44.5 x 14.3 x 44.5 mm -
RS Stock No. 436-2330
Mfr. Part No.LTS 6NP
BrandLEM
TWD710.00
Each
units
19.2:1 3.2mm - Closed Loop 5 V 19.2A - 24mm -40°C 22.2mm +85°C 10mm - -
RS Stock No. 351-910
Mfr. Part No.MI100
TWD4,861.00
Each
units
1100:1 - - - - 1100A - 67.5mm -20°C 95mm +60°C 20mm - -
RS Stock No. 871-1629
Mfr. Part No.B82801B0504A050
BrandEPCOS
TWD90.30
Each (In a Bag of 3)
units
20:1 - - - - 20A - - -40°C - +125°C - 8.13 x 7.11 x 5.08 mm -
RS Stock No. 124-3879
BrandRS PRO
TWD47.00
Each
units
50:1 5mm - - - 15A - - -40°C - +120°C - 17.2 x 9.53 x 20.4 mm -