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 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. 173-0041
BrandRS PRO
TWD38.20
Each (In a Box of 351)
units
15:1 - - - - 15A - - -40°C - +120°C - 17.2 x 9.53 x 20.4 mm -
RS Stock No. 729-5517
Mfr. Part No.AC-1100
TWD218.00
Each
units
100:1 - - - - 100A - - -40°C - +120°C - 44.5 x 14.3 x 44.5 mm -
RS Stock No. 731-5267
Mfr. Part No.HTA 200-S
BrandLEM
TWD2,061.00
Each
units
200:1 32mm - Open Loop ±15 V 200A - 70mm -25°C 90mm +85°C 27.5mm - -
RS Stock No. 871-1648
Mfr. Part No.B82801C2245A200
BrandEPCOS
TWD113.00
Each (In a Bag of 3)
units
40:1 - - - - 40A - - -40°C - +125°C - 14.22 x 13.46 x 10 mm -
RS Stock No. 167-0564
Mfr. Part No.B82801C2245A200
BrandEPCOS
TWD69.90
Each (On a Reel of 200)
units
40:1 - - - - 40A - - -40°C - +125°C - 14.22 x 13.46 x 10 mm -
RS Stock No. 435-8640
Mfr. Part No.HX 10-P
BrandLEM
TWD425.00
Each
units
30:1 1.1mm - Open Loop 15 V 30A - 20mm -25°C 19mm +85°C 15.4mm - -
RS Stock No. 436-2330
Mfr. Part No.LTS 6NP
BrandLEM
TWD597.00
Each
units
19.2:1 3.2mm - Closed Loop 5 V 19.2A - 24mm -40°C 22.2mm +85°C 10mm - -
RS Stock No. 124-3879
BrandRS PRO
TWD47.00
Each
units
15:1 - - - - 15A - - -40°C - +120°C - 17.2 x 9.53 x 20.4 mm -
RS Stock No. 451-1368
Mfr. Part No.LF 305S
BrandLEM
TWD2,360.00
Each
units
300:1 20.1mm - Closed Loop 12 → 20 V 300A 150 mArms 56.5mm -40°C 60mm +85°C 26.6mm - -
RS Stock No. 793-4587
Mfr. Part No.HLSR 20-P
BrandLEM
TWD410.00
Each
units
50:1 - - Open Loop 4.5 → 5.5 V 50A 20 A 12mm -40°C 17.2mm +105°C 21mm - -
RS Stock No. 351-910
Mfr. Part No.MI100
TWD4,629.00
Each
units
1100:1 - - - - 1100A - 67.5mm -20°C 95mm +60°C 20mm - -
RS Stock No. 181-2129
Mfr. Part No.CSLA2CD
BrandHoneywell
TWD688.00
Each
units
- 10.9mm - Open Loop 6 → 12 V dc - - - - - - - - -
RS Stock No. 532-9097
Mfr. Part No.HXS 20-NP
BrandLEM
TWD338.00
Each
units
60:1 - - Open Loop 5 V 60A - 10.7mm -40°C 16.7mm +105°C 18.7mm - -
RS Stock No. 206-2381
Mfr. Part No.HAL 50-S
BrandLEM
TWD1,583.00
Each
units
150:1 20 x 15mm - Open Loop 15 V 150A - 41mm -25°C 41.27mm +85°C 31.3mm - -
RS Stock No. 331-430
Mfr. Part No.CT132M150/5-2.5/1
BrandHOBUT
TWD544.00
Each
units
150:5 21mm DIN Rail Mounted - - 150A 5 A 65mm -30°C 45mm +85°C 30mm - -
RS Stock No. 477-4711
Mfr. Part No.CSNS300M
BrandHoneywell
TWD3,356.00
Each
units
600:1 26mm - Closed Loop 15 V 600A 150 mA 61.2mm -40°C 67.5mm +85°C 19mm - -
RS Stock No. 286-311
Mfr. Part No.LA 25-NP
BrandLEM
TWD820.00
Each
units
36:1 - - Closed Loop 15 V 36A 25 mArms 16.45mm -40°C 26mm +85°C 29.2mm - -
RS Stock No. 106-8535
Mfr. Part No.56T200C
TWD52.60
Each (In a Tube of 25)
units
10:1 - - - - 10A - - -40°C - +85°C - 16.79 x 8.89 x 20.19 mm -
RS Stock No. 886-2121
Mfr. Part No.XM02-175051S000000
TWD412.00
Each
units
80:5 21mm Base Mounted - - - - - - - - - 45 x 40 x 65 mm -
RS Stock No. 497-182
Mfr. Part No.HASS 50-S
BrandLEM
TWD690.00
Each
units
150:1 20.4 x 10.4mm - Open Loop 5 V 150A - 30mm -40°C 40mm +85°C 30mm - -