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. 182-8468
Mfr. Part No.48290555
BrandSocomec
$83.07
Each
units
63:1 - - - - 63A 75.6 A 44mm -10°C 28mm +70°C 26mm 28 x 26 x 44 mm DIRIS A-40, DIRIS B, DIRIS Digiware
RS Stock No. 122-0565
Mfr. Part No.49506030
BrandSocomec
$118.85
Each
units
65:5 30mm - - - 65A 5 A - -40°C - +80°C - 92 x 26 x 103.5 mm DIRIS A80, RESYS
RS Stock No. 184-9457
Mfr. Part No.48290558
BrandSocomec
$146.52
Each
units
- - Split Core - - - - 86mm -10°C 53mm +55°C 47mm 53 x 47 x 86 mm DIRIS A-40, DIRIS B, DIRIS Digiware
RS Stock No. 122-0471
Mfr. Part No.192T3240
BrandSocomec
$63.14
Each
units
- 26mm - - - - - - - - - - 75.5 x 61 x 48 mm -
RS Stock No. 122-0474
Mfr. Part No.192T3325
BrandSocomec
$145.42
Each
units
- 18mm - - - - - - - - - - 115 x 65 x 37 mm -
RS Stock No. 182-8460
Mfr. Part No.48290500
BrandSocomec
$25.88
Each
units
20:1 - - - - 20A 24 A 45mm -10°C 28mm +70°C 20mm 28 x 20 x 45 mm DIRIS B-30, DIRIS Digiware
RS Stock No. 122-0566
Mfr. Part No.49506080
BrandSocomec
$143.79
Each
units
160:5 80mm - - - 160A 5 A - -40°C - 80°C - 116 x 26 x 125 mm DIRIS A80, RESYS
RS Stock No. 187-9961
Mfr. Part No.192T0003
BrandSocomec
$2.86
Each
units
- - - - - - - - - - - - - TRB 60 Current Transformers
RS Stock No. 122-0480
Mfr. Part No.192T9696
BrandSocomec
$207.38
Each
units
- 85mm - - - - - - - - - - 184.8 x 172 x 52 mm -
RS Stock No. 122-0478
Mfr. Part No.192T5090
BrandSocomec
$107.16
Each
units
- 44mm - - - - - - - - - - 98.5 x 86 x 58 mm -
RS Stock No. 122-0568
Mfr. Part No.49506200
BrandSocomec
$434.34
Each
units
400:5 200mm - - - 400A 5 A - -40°C - +80°C - 253 x 51 x 274 mm DIRIS A80, RESYS
RS Stock No. 187-9931
Mfr. Part No.192T2006
BrandSocomec
$57.47
Each
units
60:5 - DIN Rail Mounted - - 60A 5 A 65mm - 45mm - 30mm 65 x 45 x 30 mm Energy Meters, Mutlfunction Meters
RS Stock No. 122-0550
Mfr. Part No.48290503
BrandSocomec
$66.53
Each
units
- - - - - - - - -10°C - +70°C - 71 x 35 x 32.5 mm DIRIS B-30, DIRIS Digiware
RS Stock No. 182-8467
Mfr. Part No.192T1405
BrandSocomec
$59.19
Each
units
50:5 - Toroidal Ring - - 50A 5 A 65mm - 45mm - 30mm 45 x 30 x 65 mm Measurement Devices
RS Stock No. 122-0470
Mfr. Part No.192T3225
BrandSocomec
$44.46
Each
units
- 26mm - - - - - - - - - - 75.5 x 61 x 48 mm -
RS Stock No. 122-0468
Mfr. Part No.192T2340
BrandSocomec
$63.84
Each
units
- 26mm - - - - - - - - - - 75.5 x 61 x 48 mm -
RS Stock No. 122-0472
Mfr. Part No.192T3310
BrandSocomec
$138.41
Each
units
- 18mm - - - - - - - - - - 115 x 65 x 37 mm -
RS Stock No. 122-0476
Mfr. Part No.192T5060
BrandSocomec
$76.91
Each
units
- 44mm - - - - - - - - - - 98.5 x 86 x 58 mm -
RS Stock No. 187-9941
Mfr. Part No.192T0525
BrandSocomec
$89.21
Each
units
25:5 - DIN Rail Mounted - - 25A 5 A 85.5mm - 71mm - 45mm 85.5 x 71 x 45 mm Energy Meters, Mutlfunction Meters
RS Stock No. 182-8466
Mfr. Part No.192T1404
BrandSocomec
$57.47
Each
units
40:5 - Toroidal Ring - - 40A 5 A 65mm - 45mm - 30mm 45 x 30 x 65 mm Measurement Devices