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. 533-0621
Mfr. Part No.CTSCEN200<1000/5
BrandHOBUT
PHP5,574.46
Each
units
200:5, 400:5, 600:5, 800:5, 1000:5 - Clip Fit - - - - 125mm -30°C 132mm +80°C 38mm - -
RS Stock No. 914-5310
Mfr. Part No.CT132TRAN10A-5/10V
BrandHOBUT
PHP1,935.20
Each
units
10:1 21mm - - 15 → 30 V 10A - 65mm -15°C 45mm +50°C 30mm - -
RS Stock No. 914-5288
Mfr. Part No.CT132TRAN100A-4/20MA
BrandHOBUT
PHP3,187.28
Each
units
100:1 21mm - - 15 → 30 V 100A 4 → 20 mA 65mm -15°C 45mm +50°C 30mm - -
RS Stock No. 819-9779
Mfr. Part No.90AS
BrandEfergy
PHP755.43
Each
units
- 12mm Split Core - - - - - - - - - - Data Loggers/DAS, Digital or Analog Meters, DMMs, Recorders
RS Stock No. 801-6296
Mfr. Part No.2810625
PHP16,350.71
Each
units
5:1 - - - 19.2 → 253 V ac/dc 5A 0 → 20 mA 104mm -20°C 22.5mm +65°C 114.5mm - -
RS Stock No. 173-0041
BrandRS PRO
PHP67.445
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. 418-3604
Mfr. Part No.CTSCEN100<400/5
BrandHOBUT
PHP4,896.65
Each
units
100:5, 200:5, 300:5, 400:5 - Clip Fit - - - - 113mm -30°C 127mm +80°C 40mm - -
RS Stock No. 124-3879
BrandRS PRO
PHP82.25
Each
units
50:1 5mm - - - 15A - - -40°C - +120°C - 17.2 x 9.53 x 20.4 mm -
RS Stock No. 537-4485
Mfr. Part No.AC-1005
PHP212.442
Each (In a Pack of 5)
units
5:1 - - - - 5A - - -40°C - +120°C - 23.8 x 23.8 x 11.12 mm -
RS Stock No. 819-9798
Mfr. Part No.140AS
BrandEfergy
PHP918.07
Each
units
- 19mm - - - - - - - - - - - Oscilloscopes
RS Stock No. 446-0535
Mfr. Part No.AKR 5 C420L
BrandLEM
PHP22,125.96
Each
units
5:1 19mm - - 24 V dc, 150 V ac 5A 4 → 20 mA 55.4mm -20°C 88.9mm +50°C 23.7mm - -
RS Stock No. 751-1620
Mfr. Part No.93484 P1
PHP1,064.85
Each
units
200:1 - - - - 200A - - -20°C - +70°C - 62 (Dia.) x 20 mm -
RS Stock No. 331-597
Mfr. Part No.CT132M40/5-1/3
BrandHOBUT
PHP905.11
Each
units
40:5 21mm DIN Rail Mounted - - 40A 5 A 65mm -30°C 45mm +85°C 30mm - -
RS Stock No. 331-474
Mfr. Part No.CT132M50/5-1/1
BrandHOBUT
PHP881.34
Each
units
50:5 21mm DIN Rail Mounted - - 50A 5 A 65mm -30°C 45mm +85°C 30mm - -
RS Stock No. 257-802
Mfr. Part No.CT173M150/5-2.5/1-001
BrandHOBUT
PHP1,437.28
Each
units
150:5 40mm Base Mounted - - 150A 5 A 95mm -30°C 70mm +85°C 55mm - -
RS Stock No. 820-0431
Mfr. Part No.2904921
PHP17,246.30
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. 313-839
Mfr. Part No.CT173M120/5-2.5/1-002
BrandHOBUT
PHP835.15
Each
units
120:5 40mm Base Mounted - - 120A 5 A 95mm -30°C 70mm +85°C 55mm - -
RS Stock No. 914-5294
Mfr. Part No.CTSCMWH60/0.333V
BrandHOBUT
PHP1,120.27
Each
units
60:1 10mm Split Core - - 60A 333 mV - -15°C - +50°C - 28.7 x 26.4 x 41.7 mm Multi Function Meter
RS Stock No. 914-5301
Mfr. Part No.CTSCMWH500/0.333V
BrandHOBUT
PHP2,441.67
Each
units
500:1 35mm Split Core - - 500A 333 mV - -15°C - +50°C - 51.2 x 51.2 x 83.5 mm Multi Function Meter
RS Stock No. 123-6746
Mfr. Part No.XS04-485155S 000000
PHP7,833.38
Each
units
3000:5 160 x 80mm Clip Fit - - - - - - - - - 195 x 64 x 245 mm -