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. 497-209
Mfr. Part No.AT 50 B420L
BrandLEM
SGD154.17
Each
units
50:1 16mm - - 20 → 30 V dc 50A 4 → 20 mA 67mm -20°C 44.5mm +60°C 36.5mm - -
RS Stock No. 435-8640
Mfr. Part No.HX 10-P
BrandLEM
SGD20.33
Each
units
30:1 1.1mm - Open Loop 15 V 30A - 20mm -25°C 19mm +85°C 15.4mm - -
RS Stock No. 106-8533
Mfr. Part No.56200C
SGD2.457
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. 173-0066
Mfr. Part No.AZ-0500
SGD8.102
Each (In a Box of 84)
units
500:1 - - - - 25A - - -40°C - +85°C - 19.0 x 11.5 x 21.5 mm -
RS Stock No. 331-395
Mfr. Part No.CT164M300/5-2.5/1-001
BrandHOBUT
SGD33.88
Each
units
300:5 28mm DIN Rail Mounted - - 300A 5 A 78mm -30°C 60mm +85°C 45mm - -
RS Stock No. 775-4909
Mfr. Part No.AZ-0500
SGD12.00
Each
units
500:1 - - - - 25A - - -40°C - +85°C - 19.0 x 11.5 x 21.5 mm -
RS Stock No. 913-9738
Mfr. Part No.METSECT5CC020
SGD89.11
Each
units
200:5 21mm Toroidal Ring - - - - - -25°C - +60°C - 65 x 44 x 30 mm -
RS Stock No. 499-5536
Mfr. Part No.AP 50 B10
BrandLEM
SGD159.77
Each
units
50:1 18mm - Closed Loop 24 V dc 50A - 69mm -20°C 67mm +60°C 55mm - -
RS Stock No. 301-9502
Mfr. Part No.HAS 200S
BrandLEM
SGD38.09
Each
units
600:1 20.4 x 10.4mm - Open Loop 15 V 600A - 30mm -10°C 40mm +80°C 30mm - -
RS Stock No. 886-2102
Mfr. Part No.XW01-075081S000000
SGD30.97
Each
units
15:5 - Base Mounted - - - - - - - - - 62 x 40 x 78 mm -
RS Stock No. 793-4584
Mfr. Part No.HLSR 10-P
BrandLEM
SGD19.98
Each
units
25:1 - - Open Loop 4.5 → 5.5 V 25A 10 A 12mm -40°C 17.2mm +105°C 21mm - -
RS Stock No. 914-5272
Mfr. Part No.CT160-5-L7
BrandHOBUT
SGD35.58
Each
units
- - - - - - - - -30°C - +85°C - 60 x 43 x 85 mm -
RS Stock No. 527-8466
Mfr. Part No.DHR 100 C420
BrandLEM
SGD273.29
Each
units
100:1 32mm - Open Loop 20 → 50 V dc 100A 4 → 20 mA 70mm -40°C 90mm +70°C 25mm - -
RS Stock No. 124-3898
BrandRS PRO
SGD3.68
Each
units
500:1 5mm - - - 5A - - -40°C - +120°C - 17.2 x 9.53 x 20.4 mm -
RS Stock No. 497-198
Mfr. Part No.HASS 100-S
BrandLEM
SGD33.04
Each
units
300:1 20.4 x 10.4mm - Open Loop 5 V 300A - 30mm -40°C 40mm +85°C 30mm - -
RS Stock No. 820-0444
Mfr. Part No.2904923
SGD520.26
Each
units
4000:1 8.3mm - - 24 V dc 4000A 0 → 1 A 70.4mm -30°C 22.5mm +80°C 85mm - -
RS Stock No. 886-2099
Mfr. Part No.XW01-045081S000000
SGD30.96
Each
units
5:5 - Base Mounted - - - - - - - - - 62 x 40 x 78 mm -
RS Stock No. 173-0044
BrandRS PRO
SGD1.977
Each (In a Box of 351)
units
300:1 5mm - - - 15A - - -40°C - +120°C - 17.2 x 9.53 x 20.4 mm -
RS Stock No. 331-480
Mfr. Part No.CTSCM40600/5-5/1
BrandHOBUT
SGD61.13
Each
units
600:5 - Clip Fit - - 600A 5 A 104.5mm -30°C 116mm +80°C 35.5mm - -
RS Stock No. 180-7391
Mfr. Part No.LA 55P/SP1
BrandLEM
SGD44.76
Each
units
100:1 12.7 x 7mm - Closed Loop 12 → 15 V 100A 25 mArms 27.6mm -40°C 36.5mm +85°C 14.45mm - -