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. 819-9779
Mfr. Part No.90AS
BrandEfergy
R 264.26
Each
units
- 12mm Split Core - - - - - - - - - - Data Loggers/DAS, Digital or Analog Meters, DMMs, Recorders
RS stock no. 537-4536
Mfr. Part No.AC-1040
R 84.98
Each
units
40:1 - - - - 40A - - -40°C - +120°C - 34.9 x 14.3 x 34.9 mm -
RS stock no. 537-4485
Mfr. Part No.AC-1005
R 67.18
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. 497-182
Mfr. Part No.HASS 50-S
BrandLEM
R 343.94
Each
units
150:1 20.4 x 10.4mm - Open Loop 5 V 150A - 30mm -40°C 40mm +85°C 30mm - -
RS stock no. 286-361
Mfr. Part No.LV 25-P
BrandLEM
R 1,767.62
Each
units
14:1 - - Closed Loop 12 → 15 V 14A 25 mA 16.45mm 0°C 26mm +70°C 29.2mm - -
RS stock no. 180-7357
Mfr. Part No.LA 55-P
BrandLEM
R 429.92
Each
units
70:1 - - Closed Loop 12 → 15 V 70A 50 mArms 27.6mm -40°C 36.6mm +85°C 14.45mm - -
RS stock no. 914-5301
Mfr. Part No.CTSCMWH500/0.333V
BrandHOBUT
R 871.95
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. 914-5294
Mfr. Part No.CTSCMWH60/0.333V
BrandHOBUT
R 463.08
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. 533-0621
Mfr. Part No.CTSCEN200<1000/5
BrandHOBUT
R 1,598.66
Each
units
200:5, 400:5, 600:5, 800:5, 1000:5 - Clip Fit - - - - 125mm -30°C 132mm +80°C 38mm - -
RS stock no. 121-8178
Mfr. Part No.CSLA2EL
BrandHoneywell
R 817.69
Each
units
20:1 - - - 6 → 12 V dc 20A Maximum of 550 A 57.4mm -25°C 44.4mm +85°C 15.7mm - -
RS stock no. 173-0049
Mfr. Part No.AC-1030
R 60.611
Each (In a Box of 120)
units
30:1 - - - - 30A - - -40°C - +120°C - 30.2 x 14.3 x 30.2 mm -
RS stock no. 729-5501
Mfr. Part No.AC-1030
R 82.24
Each
units
30:1 - - - - 30A - - -40°C - +120°C - 30.2 x 14.3 x 30.2 mm -
RS stock no. 446-0591
Mfr. Part No.DK 100 B10
BrandLEM
R 7,230.25
Each
units
100:1 21.7mm - Open Loop 20 → 50 V dc 100A - 68.6mm -20°C 89.7mm +50°C 30.2mm - -
RS stock no. 169-7654
Mfr. Part No.CSLA2EL
BrandHoneywell
R 628.163
Each (In a Box of 50)
units
- - - - 6 → 12 V dc - Maximum of 550 A 57.4mm -25°C 44.4mm +85°C 15.7mm - -
RS stock no. 321-6315
Mfr. Part No.LTS 15NP
BrandLEM
R 310.45
Each
units
48:1 3.2mm - Closed Loop 5 V 48A - 24mm -40°C 22.2mm +85°C 10mm - -
RS stock no. 331-581
Mfr. Part No.CTSCM40300/5-2.5/1
BrandHOBUT
R 952.20
Each
units
300:5 - Clip Fit - - 300A 5 A 116mm -30°C 104.5mm +80°C 35.5mm - -
RS stock no. 301-9502
Mfr. Part No.HAS 200S
BrandLEM
R 717.13
Each
units
600:1 20.4 x 10.4mm - Open Loop 15 V 600A - 30mm -10°C 40mm +80°C 30mm - -
RS stock no. 793-4632
Mfr. Part No.ATO-75BILD10
BrandLEM
R 566.16
Each
units
90:1 10mm - - - 90A 90 mA 48.5mm -25°C 33.5mm +70°C 32mm - -
RS stock no. 819-9798
Mfr. Part No.140AS
BrandEfergy
R 277.44
Each
units
- 19mm - - - - - - - - - - - Oscilloscopes
RS stock no. 286-311
Mfr. Part No.LA 25-NP
BrandLEM
R 393.00
Each
units
36:1 - - Closed Loop 15 V 36A 25 mArms 16.45mm -40°C 26mm +85°C 29.2mm - -