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.


...
Read more Read less

Filters

Viewing 61 - 80 of 1084 products
Results per page
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. 793-4587
Mfr. Part No.HLSR 20-P
BrandLEM
TWD410.00
Each
units
50:1 - - 12mm Open Loop 17.2mm 4.5 → 5.5 V 50A 21mm 20 A -40°C +105°C - -
RS Stock No. 451-1380
Mfr. Part No.LF 505S
BrandLEM
TWD5,246.00
Each
units
800:1 30.2mm - 70.3mm Closed Loop 80mm 15 → 24 V 800A 40mm 100 mArms -40°C +70°C - -
RS Stock No. 331-430
Mfr. Part No.CT132M150/5-2.5/1
BrandHOBUT
TWD544.00
Each
units
150:5 21mm DIN Rail Mounted 65mm - 45mm - 150A 30mm 5 A -30°C +85°C - -
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. 173-0061
Mfr. Part No.AC-1100
TWD193.00
Each (In a Box of 27)
units
100:1 - - - - - - 100A - - -40°C +120°C 44.5 x 14.3 x 44.5 mm -
RS Stock No. 871-1629
Mfr. Part No.B82801B0504A050
BrandEPCOS
TWD85.70
Each (In a Bag of 3)
units
20:1 - - - - - - 20A - - -40°C +125°C 8.13 x 7.11 x 5.08 mm -
RS Stock No. 435-8640
Mfr. Part No.HX 10-P
BrandLEM
TWD425.00
Each
units
30:1 1.1mm - 20mm Open Loop 19mm 15 V 30A 15.4mm - -25°C +85°C - -
RS Stock No. 286-311
Mfr. Part No.LA 25-NP
BrandLEM
TWD820.00
Each
units
36:1 - - 16.45mm Closed Loop 26mm 15 V 36A 29.2mm 25 mArms -40°C +85°C - -
RS Stock No. 832-9879
Mfr. Part No.L01-8009
BrandAlttec
TWD468.00
Each
units
250:5 21.5mm Clip Fit 65mm - 45mm - - 30mm - - +40°C 65 x 45 x 67 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. 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. 436-2330
Mfr. Part No.LTS 6NP
BrandLEM
TWD617.00
Each
units
19.2:1 3.2mm - 24mm Closed Loop 22.2mm 5 V 19.2A 10mm - -40°C +85°C - -
RS Stock No. 351-910
Mfr. Part No.MI100
TWD1,923.00
Each
units
1100:1 - - 67.5mm - 95mm - 1100A 20mm - -20°C +60°C - -
RS Stock No. 532-9097
Mfr. Part No.HXS 20-NP
BrandLEM
TWD328.00
Each
units
60:1 - - 10.7mm Open Loop 16.7mm 5 V 60A 18.7mm - -40°C +105°C - -
RS Stock No. 477-4711
Mfr. Part No.CSNS300M
BrandHoneywell
TWD3,356.00
Each
units
600:1 26mm - 61.2mm Closed Loop 67.5mm 15 V 600A 19mm 150 mA -40°C +85°C - -
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. 522-018
Mfr. Part No.HAT 500-S
BrandLEM
TWD1,961.00
Each
units
1500:1 40.5 x 30.5mm - 65mm Open Loop 90mm 15 V 1500A 37mm - -10°C +80°C - -
RS Stock No. 886-2112
Mfr. Part No.XM02-145031S000000
TWD412.00
Each
units
60:5 21mm Base Mounted - - - - - - - - - 45 x 40 x 65 mm -
RS Stock No. 731-5267
Mfr. Part No.HTA 200-S
BrandLEM
TWD2,061.00
Each
units
200:1 32mm - 70mm Open Loop 90mm ±15 V 200A 27.5mm - -25°C +85°C - -
RS Stock No. 751-1642
Mfr. Part No.93490 P1
TWD803.00
Each
units
800:1 - - - - - - 800A - - -20°C +70°C 102 (Dia.) x 20 mm -