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. 668-4067
Mfr. Part No.CT105F250/5-2.5/1
BrandHOBUT
SGD71.65
Each
units
250:5 21mm Base Mounted - - - - 79mm -30°C 105mm +80°C 53mm - -
RS Stock No. 436-2330
Mfr. Part No.LTS 6NP
BrandLEM
SGD30.05
Each
units
19.2:1 3.2mm - Closed Loop 5 V 19.2A - 24mm -40°C 22.2mm +85°C 10mm - -
RS Stock No. 533-0621
Mfr. Part No.CTSCEN200<1000/5
BrandHOBUT
SGD135.03
Each
units
200:5, 400:5, 600:5, 800:5, 1000:5 - Clip Fit - - - - 125mm -30°C 132mm +80°C 38mm - -
RS Stock No. 775-4915
Mfr. Part No.AX-0500
SGD7.52
Each
units
5:1 - - - - 5A - - -40°C - +120°C - 12.7 x 17 x 9.53 mm -
RS Stock No. 399-7339
Mfr. Part No.AS-104
SGD4.61
Each
units
15:1 - - - - 15A - - -40°C - +120°C - 17.2 x 20.4 x 9.53 mm -
RS Stock No. 499-5592
Mfr. Part No.APR 50 B10
BrandLEM
SGD177.23
Each
units
50:1 18mm - Closed Loop 24 V dc 50A - 69mm -20°C 67mm +60°C 55mm - -
RS Stock No. 173-0070
Mfr. Part No.AX-0500
SGD4.309
Each (In a Box of 250)
units
5:1 - - - - 5A - - -40°C - +120°C - 12.7 x 17 x 9.53 mm -
RS Stock No. 301-9489
Mfr. Part No.HAS 50S
BrandLEM
SGD38.09
Each
units
150:1 20.4 x 10.4mm - Open Loop 15 V 150A - 30mm -10°C 40mm +80°C 30mm - -
RS Stock No. 331-339
Mfr. Part No.CT132M100/5-2.5/1
BrandHOBUT
SGD24.25
Each
units
100:5 21mm DIN Rail Mounted - - 100A 5 A 65mm -30°C 45mm +85°C 30mm - -
RS Stock No. 477-4711
Mfr. Part No.CSNS300M
BrandHoneywell
SGD165.10
Each
units
600:1 26mm - Closed Loop 15 V 600A 150 mA 61.2mm -40°C 67.5mm +85°C 19mm - -
RS Stock No. 914-5278
Mfr. Part No.CT160-5-K8
BrandHOBUT
SGD39.13
Each
units
- - - - - - - - -30°C - +85°C - 60 x 43 x 85 mm -
RS Stock No. 123-6725
Mfr. Part No.XN45-315051S000000
SGD49.93
Each
units
400:5 31mm Base Mounted - - 400A 5 A - - - - - 141 x 38 x 102.5 mm MCCB
RS Stock No. 833-2875
Mfr. Part No.2CCA880100R0001 CMS-100PS
BrandABB
SGD145.72
Each
units
80:1 10mm - - 690 V ac, 1500 V dc 80A - 27.8mm -25°C 41mm +70°C 41mm - -
RS Stock No. 418-3604
Mfr. Part No.CTSCEN100<400/5
BrandHOBUT
SGD130.93
Each
units
100:5, 200:5, 300:5, 400:5 - Clip Fit - - - - 113mm -30°C 127mm +80°C 40mm - -
RS Stock No. 914-5275
Mfr. Part No.CT160-5-H7
BrandHOBUT
SGD25.37
Each
units
- - - - - - - - -30°C - +85°C - 60 x 43 x 85 mm -
RS Stock No. 828-5209
Mfr. Part No.BZCT050
SGD85.85
Each
units
- 50mm - - - - - - -20°C - +60°C - - Broyce Type A Earth Leakage Relays
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. 886-2102
Mfr. Part No.XW01-075081S000000
SGD30.97
Each
units
15:5 - Base Mounted - - - - - - - - - 62 x 40 x 78 mm -
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. 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 - -