Current Transformers

Current transformers (CT) are devices that are used to transform the current from a high current into a lower current so that the power can then be measured and controlled. The transformers consist of a core, a primary and a secondary winding. 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.


Current transformers can perform circuit control and perform roles for safety protection and current limiting.


Current transformers are found in:


  • Generating stations,

  • Electrical substations

  • Commercial electric power distribution.

Types of Current Transformers


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.


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Description Price Current Ratio Bore Size Transformer Type Overall Height Sensor Technology Overall Width Supply Voltage Input Current Overall Depth Output Current Minimum Temperature Maximum Temperature Dimensions For Use With
RS Stock No. 207-2940
Mfr. Part No.HTA 1000-S
BrandLEM
TWD2,821.00
Each
units
1000:1 32mm - 70mm Open Loop 90mm 15 V 1000A 27.5mm - -25°C +85°C - -
RS Stock No. 207-3016
Mfr. Part No.HY 5-P
BrandLEM
TWD812.00
Each
units
15:1 0.7mm - 23mm Open Loop 36mm 12 → 15 V 15A 12mm - -10°C +80°C - -
RS Stock No. 173-0057
Mfr. Part No.AX-1000
TWD106.30
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. 177-5952
Mfr. Part No.CSLA1CD
BrandHoneywell
TWD617.30
Each (In a Tray of 50)
units
- - - - - - - - - - - - - -
RS Stock No. 775-4928
Mfr. Part No.AX-1000
TWD119.00
Each
units
10:1 - - - - - - 10A - - -40°C +120°C 12.7 x 17 x 9.53 mm -
RS Stock No. 914-5284
Mfr. Part No.CT132TRAN50A-4/20MA
BrandHOBUT
TWD1,570.00
Each
units
50:1 21mm - 65mm - 45mm 15 → 30 V 50A 30mm 4 → 20 mA -15°C +50°C - -
RS Stock No. 650-554
Mfr. Part No.CSLA1CD
BrandHoneywell
TWD861.00
Each
units
- 10.9mm - - Open Loop - 8 → 16 V dc - - - - - - -
RS Stock No. 521-958
Mfr. Part No.HAT 400-S
BrandLEM
TWD1,961.00
Each
units
1200:1 40.5 x 30.5mm - 65mm Open Loop 90mm 15 V 1200A 37mm - -10°C +80°C - -
RS Stock No. 532-9198
Mfr. Part No.HAIS 50-P
BrandLEM
TWD838.00
Each
units
150:1 15 x 8mm - 29.5mm Open Loop 33mm 5 V 150A 14mm - -40°C +85°C - -
RS Stock No. 886-2118
Mfr. Part No.XM02-135031S000000
TWD412.00
Each
units
50:5 21mm Base Mounted - - - - - - - - - 45 x 40 x 65 mm -
RS Stock No. 532-9255
Mfr. Part No.HTFS 800-P
BrandLEM
TWD717.00
Each
units
1200:1 22mm - 46mm Open Loop 40mm 5 V 1200A 17mm - -40°C +105°C - -
RS Stock No. 499-5542
Mfr. Part No.AP 100 B10
BrandLEM
TWD4,036.00
Each
units
100:1 18mm - 69mm Closed Loop 67mm 24 V dc 100A 55mm - -20°C +60°C - -
RS Stock No. 497-221
Mfr. Part No.LA 25-P
BrandLEM
TWD1,299.00
Each
units
55:1 - - 27.2mm Closed Loop 36.5mm 12 → 15 V 55A 14.45mm 25 mArms -25°C +85°C - -
RS Stock No. 715-7049
Mfr. Part No.53150C
TWD37.00
Each
units
10:1 - - - - - - 10A - - -40°C +125°C 8.3 x 7.2 x 5.4 mm -
RS Stock No. 751-1627
Mfr. Part No.93486 P1
TWD563.00
Each
units
300:1 - - - - - - 300A - - -20°C +70°C 62 (Dia.) x 20 mm -
RS Stock No. 451-1396
Mfr. Part No.LF 1005S
BrandLEM
TWD7,684.00
Each
units
1500:1 40.5mm - 95mm Closed Loop 110mm 15 → 24 V 1500A 34.3mm 200 mArms -40°C +85°C - -
RS Stock No. 532-9182
Mfr. Part No.HAIS 400-P
BrandLEM
TWD719.00
Each
units
600:1 15 x 8mm - 29.5mm Open Loop 33mm 5 V 600A 14mm - -40°C +85°C - -
RS Stock No. 179-6667
Mfr. Part No.LA 100-P
BrandLEM
TWD783.00
Each
units
150:1 12.7 x 7mm - 27.6mm Closed Loop 36.5mm 12 → 15 V 150A 14.45mm 50 mArms -40°C +85°C - -
RS Stock No. 532-9249
Mfr. Part No.HTFS 400-P/SP2
BrandLEM
TWD826.00
Each
units
600:1 22mm - 46.3mm Open Loop 40mm 5 V 600A 17mm - -40°C +105°C - -
RS Stock No. 106-8528
Mfr. Part No.53150C
TWD28.60
Each (On a Reel of 1000)
units
10:1 - - - - - - 10A - - -40°C +125°C 8.3 x 7.2 x 5.4 mm -