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. 919-4700
Mfr. Part No.LF 510-S
BrandLEM
HK$559.79
Each
units
800:1 - - 70mm Closed Loop 89mm ±14.25 → ±25.2 V 800A 40.6mm ±0.16 A -40°C +85°C - -
RS Stock No. 331-339
Mfr. Part No.CT132M100/5-2.5/1
BrandHOBUT
HK$118.24
Each
units
100:5 21mm DIN Rail Mounted 65mm - 45mm - 100A 30mm 5 A -30°C +85°C - -
RS Stock No. 668-4067
Mfr. Part No.CT105F250/5-2.5/1
BrandHOBUT
HK$378.92
Each
units
250:5 21mm Base Mounted 79mm - 105mm - - 53mm - -30°C +80°C - -
RS Stock No. 913-9734
Mfr. Part No.METSECT5CC013
HK$574.20
Each
units
125:5 21mm Toroidal Ring - - - - - - - -25°C +60°C 65 x 44 x 30 mm -
RS Stock No. 286-361
Mfr. Part No.LV 25-P
BrandLEM
HK$606.53
Each
units
14:1 - - 16.45mm Closed Loop 26mm 12 → 15 V 14A 29.2mm 25 mA 0°C +70°C - -
RS Stock No. 537-4485
Mfr. Part No.AC-1005
HK$27.388
Each (In a Pack of 5)
units
5:1 - - - - - - 5A - - -40°C +120°C 23.8 x 23.8 x 11.12 mm -
RS Stock No. 499-5378
Mfr. Part No.LTSR 25-NP
BrandLEM
HK$175.90
Each
units
80:1 3.2mm - 24mm Closed Loop 22.2mm 5 V 80A 10mm - -40°C +85°C - -
RS Stock No. 533-0621
Mfr. Part No.CTSCEN200<1000/5
BrandHOBUT
HK$687.43
Each
units
200:5, 400:5, 600:5, 800:5, 1000:5 - Clip Fit 125mm - 132mm - - 38mm - -30°C +80°C - -
RS Stock No. 775-4934
Mfr. Part No.ACX-1050
HK$40.96
Each
units
50:1 - - - - - - 50A - - -40°C +85°C 23.8 x 23.8 x 11.12 mm -
RS Stock No. 819-9779
Mfr. Part No.90AS
BrandEfergy
HK$97.25
Each
units
- 12mm Split Core - - - - - - - - - - Data Loggers/DAS, Digital or Analog Meters, DMMs, Recorders
RS Stock No. 793-4613
Mfr. Part No.DVL 1000
BrandLEM
HK$1,792.45
Each
units
- - - 48.3mm - 63mm ±15 → 24 V - 100mm 50 mA -40°C +85°C - -
RS Stock No. 173-0064
Mfr. Part No.ACX-1050
HK$36.642
Each (In a Box of 240)
units
50:1 - - - - - - 50A - - -40°C +85°C 23.8 x 23.8 x 11.12 mm -
RS Stock No. 532-9211
Mfr. Part No.HTFS 200-P/SP2
BrandLEM
HK$207.88
Each
units
300:1 22mm - 46.3mm Open Loop 40mm 5 V 300A 17mm - -40°C +105°C - -
RS Stock No. 435-8735
Mfr. Part No.HX 20-P/SP2
BrandLEM
HK$99.87
Each
units
60:1 1.6mm - 20.5mm Open Loop 19mm 12 → 15 V 60A 15.4mm - -25°C +85°C - -
RS Stock No. 446-0614
Mfr. Part No.DK 100 B420
BrandLEM
HK$4,092.20
Each
units
100:1 21.7mm - 68.6mm Open Loop 89.7mm 20 → 50 V dc 100A 30.2mm 4 → 20 mA -20°C +50°C - -
RS Stock No. 331-519
Mfr. Part No.CT143M100/5-2.5/1-001
BrandHOBUT
HK$138.85
Each
units
100:5 24mm DIN Rail Mounted 70mm - 49mm - 100A 45mm 5 A -30°C +85°C - -
RS Stock No. 668-4064
Mfr. Part No.CT105F200/5-2.5/1
BrandHOBUT
HK$370.20
Each
units
200:5 21mm Base Mounted 79mm - 105mm - - 53mm - -30°C +80°C - -
RS Stock No. 302-6077
Mfr. Part No.2814359
HK$2,362.21
Each
units
5:1 - - 99mm - 22.5mm - 5A 114.5mm 0 → 20 mA -25°C +60°C - -
RS Stock No. 451-1368
Mfr. Part No.LF 305S
BrandLEM
HK$537.17
Each
units
300:1 20.1mm - 56.5mm Closed Loop 60mm 12 → 20 V 300A 26.6mm 150 mArms -40°C +85°C - -
RS Stock No. 668-4055
Mfr. Part No.CT105F150/5-2.5/1
BrandHOBUT
HK$358.28
Each
units
150:5 21mm Base Mounted 79mm - 105mm - - 53mm - -30°C +80°C - -
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