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. 321-6292
Mfr. Part No.LAH 50-P
BrandLEM
TWD868.00
Each
units
50:1 - - Closed Loop 12 → 15 V 50A 25 mArms 21mm -25°C 33.3mm +85°C 14.93mm - -
RS Stock No. 207-3016
Mfr. Part No.HY 5-P
BrandLEM
TWD1,370.00
Each
units
15:1 0.7mm - Open Loop 12 → 15 V 5A - 23mm -10°C 36mm +80°C 12mm - -
RS Stock No. 532-9198
Mfr. Part No.HAIS 50-P
BrandLEM
TWD838.00
Each
units
150:1 15 x 8mm - Open Loop 5 V 150A - 29.5mm -40°C 33mm +85°C 14mm - -
RS Stock No. 775-4928
Mfr. Part No.AX-1000
TWD121.00
Each
units
10:1 - - - - 10A - - -40°C - +120°C - 12.7 x 17 x 9.53 mm -
RS Stock No. 177-5952
Mfr. Part No.CSLA1CD
BrandHoneywell
TWD650.10
Each (In a Tray of 50)
units
- - - - - - - - - - - - - -
RS Stock No. 532-9255
Mfr. Part No.HTFS 800-P
BrandLEM
TWD768.00
Each
units
1200:1 22mm - Open Loop 5 V 1200A - 46mm -40°C 40mm +105°C 17mm - -
RS Stock No. 650-554
Mfr. Part No.CSLA1CD
BrandHoneywell
TWD907.00
Each
units
- 10.9mm - Open Loop 8 → 16 V dc - - - - - - - - -
RS Stock No. 914-5284
Mfr. Part No.CT132TRAN50A-4/20MA
BrandHOBUT
TWD1,681.00
Each
units
50:1 21mm - - 15 → 30 V 50A 4 → 20 mA 65mm -15°C 45mm +50°C 30mm - -
RS Stock No. 173-0057
Mfr. Part No.AX-1000
TWD108.00
Each (In a Box of 250)
units
10:1 - - - - 10A - - -40°C - +120°C - 12.7 x 17 x 9.53 mm -
RS Stock No. 521-958
Mfr. Part No.HAT 400-S
BrandLEM
TWD1,992.00
Each
units
1200:1 40.5 x 30.5mm - Open Loop 15 V 1200A - 65mm -10°C 90mm +80°C 37mm - -
RS Stock No. 499-5542
Mfr. Part No.AP 100 B10
BrandLEM
TWD4,099.00
Each
units
100:1 18mm - Closed Loop 24 V dc 100A - 69mm -20°C 67mm +60°C 55mm - -
RS Stock No. 886-2118
Mfr. Part No.XM02-135031S000000
TWD419.00
Each
units
50:5 21mm Base Mounted - - - - - - - - - 45 x 40 x 65 mm -
RS Stock No. 446-0636
Mfr. Part No.DK 300 B420
BrandLEM
TWD15,761.00
Each
units
300:1 21.7mm - - 20 → 50 V dc, 22 → 38 V ac 300A 4 → 20 mA 57.2mm -20°C 89.7mm +50°C 30mm - -
RS Stock No. 301-9473
Mfr. Part No.LTS 25NP
BrandLEM
TWD713.00
Each
units
80:1 3.2mm - Closed Loop 5 V 80A - 24mm -40°C 22.2mm +85°C 10mm - -
RS Stock No. 106-8528
Mfr. Part No.53150C
TWD29.20
Each (On a Reel of 1000)
units
10:1 - - - - 10A - - -40°C - +125°C - 8.3 x 7.2 x 5.4 mm -
RS Stock No. 666-8214
Mfr. Part No.CKSR 50-NP
BrandLEM
TWD685.00
Each
units
50:1 - - Closed Loop 5.25 V 50A - 16.5mm -40°C 21.91mm +105°C 13.4mm - -
RS Stock No. 532-9249
Mfr. Part No.HTFS 400-P/SP2
BrandLEM
TWD885.00
Each
units
600:1 22mm - Open Loop 5 V 600A - 46.3mm -40°C 40mm +105°C 17mm - -
RS Stock No. 179-6667
Mfr. Part No.LA 100-P
BrandLEM
TWD1,252.00
Each
units
150:1 12.7 x 7mm - Closed Loop 12 → 15 V 150A 50 mArms 27.6mm -40°C 36.5mm +85°C 14.45mm - -
RS Stock No. 532-9205
Mfr. Part No.HTFS 200-P
BrandLEM
TWD941.00
Each
units
300:1 22mm - Open Loop 5 V 300A - 46mm -40°C 40mm +105°C 17mm - -
RS Stock No. 123-6734
Mfr. Part No.XS02-285055S 000000
TWD1,670.00
Each
units
300:5 80 x 50mm Clip Fit - - - - - - - - - 125 x 40 x 158 mm -