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. 451-1368
Mfr. Part No.LF 305S
BrandLEM
TWD2,478.00
Each
units
300:1 20.1mm - Closed Loop 12 → 20 V 300A 150 mArms 56.5mm -40°C 60mm +85°C 26.6mm - -
RS Stock No. 162-0255
Mfr. Part No.B82801B0504A050
BrandEPCOS
TWD44.80
Each (On a Reel of 900)
units
20:1 - - - - 20A - - -40°C - +125°C - 8.13 x 7.11 x 5.08 mm -
RS Stock No. 731-5267
Mfr. Part No.HTA 200-S
BrandLEM
TWD2,230.00
Each
units
200:1 32mm - Open Loop ±15 V 200A - 70mm -25°C 90mm +85°C 27.5mm - -
RS Stock No. 886-2121
Mfr. Part No.XM02-175051S000000
TWD419.00
Each
units
80:5 21mm Base Mounted - - - - - - - - - 45 x 40 x 65 mm -
RS Stock No. 106-8535
Mfr. Part No.56T200C
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. 532-9097
Mfr. Part No.HXS 20-NP
BrandLEM
TWD604.00
Each
units
60:1 - - Open Loop 5 V 60A - 10.7mm -40°C 16.7mm +105°C 18.7mm - -
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. 331-430
Mfr. Part No.CT132M150/5-2.5/1
BrandHOBUT
TWD544.00
Each
units
150:5 21mm DIN Rail Mounted - - 150A 5 A 65mm -30°C 45mm +85°C 30mm - -
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. 793-4587
Mfr. Part No.HLSR 20-P
BrandLEM
TWD410.00
Each
units
50:1 - - Open Loop 4.5 → 5.5 V 50A 20 A 12mm -40°C 17.2mm +105°C 21mm - -
RS Stock No. 522-018
Mfr. Part No.HAT 500-S
BrandLEM
TWD1,992.00
Each
units
1500:1 40.5 x 30.5mm - Open Loop 15 V 1500A - 65mm -10°C 90mm +80°C 37mm - -
RS Stock No. 173-0061
Mfr. Part No.AC-1100
TWD196.10
Each (In a Box of 27)
units
100:1 - - - - 100A - - -40°C - +120°C - 44.5 x 14.3 x 44.5 mm -
RS Stock No. 286-311
Mfr. Part No.LA 25-NP
BrandLEM
TWD943.00
Each
units
36:1 - - Closed Loop 15 V 36A 25 mArms 16.45mm -40°C 26mm +85°C 29.2mm - -
RS Stock No. 451-1380
Mfr. Part No.LF 505S
BrandLEM
TWD5,246.00
Each
units
800:1 30.2mm - Closed Loop 15 → 24 V 800A 100 mArms 70.3mm -40°C 80mm +70°C 40mm - -
RS Stock No. 886-2112
Mfr. Part No.XM02-145031S000000
TWD419.00
Each
units
60:5 21mm Base Mounted - - - - - - - - - 45 x 40 x 65 mm -
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. 435-8634
Mfr. Part No.HX 05-P
BrandLEM
TWD432.00
Each
units
15:1 0.8mm - Open Loop 15 V 15A - 20mm -25°C 19mm +85°C 15.4mm - -
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. 106-8537
Mfr. Part No.56T100C
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. 446-0642
Mfr. Part No.DK 400 B420
BrandLEM
TWD15,761.00
Each
units
400:1 21.7mm - - 20 → 50 V dc, 22 → 38 V ac 400A 4 → 20 mA 57.2mm -20°C 89.7mm +50°C 30mm - -