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 Inner Diameter Transformer Type Overall Height Sensor Technology Overall Width Supply Voltage Input Current Overall Depth Output Current Minimum Temperature Maximum Temperature Dimensions
RS stock no. 819-9779
Mfr. Part No.90AS
BrandEfergy
R 264.26
Each
units
- 12mm - Split Core - - - - - - - - - -
RS stock no. 537-4536
Mfr. Part No.AC-1040
R 83.36
Each
units
40:1 - - - - - - - 40A - - -40°C +120°C 34.9 x 14.3 x 34.9 mm
RS stock no. 537-4485
Mfr. Part No.AC-1005
R 65.772
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. 497-182
Mfr. Part No.HASS 50-S
BrandLEM
R 431.78
Each
units
150:1 20.4 x 10.4mm - - 30mm Open Loop 40mm 5 V 150A 30mm - -40°C +85°C -
RS stock no. 286-361
Mfr. Part No.LV 25-P
BrandLEM
R 1,767.62
Each
units
14:1 - - - 16.45mm Closed Loop 26mm 12 → 15 V 14A 29.2mm 25 mA 0°C +70°C -
RS stock no. 180-7357
Mfr. Part No.LA 55-P
BrandLEM
R 714.99
Each
units
70:1 - - - 27.6mm Closed Loop 36.6mm 12 → 15 V 70A 14.45mm 50 mArms -40°C +85°C -
RS stock no. 914-5294
Mfr. Part No.CTSCMWH60/0.333V
BrandHOBUT
R 463.08
Each
units
60:1 10mm - Split Core - - - - 60A - 333 mV -15°C +50°C 28.7 x 26.4 x 41.7 mm
RS stock no. 914-5301
Mfr. Part No.CTSCMWH500/0.333V
BrandHOBUT
R 871.95
Each
units
500:1 35mm - Split Core - - - - 500A - 333 mV -15°C +50°C 51.2 x 51.2 x 83.5 mm
RS stock no. 173-0049
Mfr. Part No.AC-1030
R 66.559
Each (In a Box of 120)
units
30:1 - - - - - - - 30A - - -40°C +120°C 30.2 x 14.3 x 30.2 mm
RS stock no. 169-7654
Mfr. Part No.CSLA2EL
BrandHoneywell
R 645.084
Each (In a Box of 50)
units
- - - - 57.4mm - 44.4mm 6 → 12 V dc - 15.7mm Maximum of 550 A -25°C +85°C -
RS stock no. 121-8178
Mfr. Part No.CSLA2EL
BrandHoneywell
R 839.72
Each
units
20:1 - - - 57.4mm - 44.4mm 6 → 12 V dc 20A 15.7mm Maximum of 550 A -25°C +85°C -
RS stock no. 446-0591
Mfr. Part No.DK 100 B10
BrandLEM
R 7,424.59
Each
units
100:1 21.7mm - - 68.6mm Open Loop 89.7mm 20 → 50 V dc 100A 30.2mm - -20°C +50°C -
RS stock no. 533-0621
Mfr. Part No.CTSCEN200<1000/5
BrandHOBUT
R 1,635.57
Each
units
200:5, 400:5, 600:5, 800:5, 1000:5 - - Clip Fit 125mm - 132mm - - 38mm - -30°C +80°C -
RS stock no. 729-5501
Mfr. Part No.AC-1030
R 81.78
Each
units
30:1 - - - - - - - 30A - - -40°C +120°C 30.2 x 14.3 x 30.2 mm
RS stock no. 321-6315
Mfr. Part No.LTS 15NP
BrandLEM
R 393.42
Each
units
48:1 3.2mm - - 24mm Closed Loop 22.2mm 5 V 48A 10mm - -40°C +85°C -
RS stock no. 331-581
Mfr. Part No.CTSCM40300/5-2.5/1
BrandHOBUT
R 974.25
Each
units
300:5 - - Clip Fit 116mm - 104.5mm - 300A 35.5mm 5 A -30°C +80°C -
RS stock no. 793-4632
Mfr. Part No.ATO-75BILD10
BrandLEM
R 581.05
Each
units
90:1 10mm - - 48.5mm - 33.5mm - 90A 32mm 90 mA -25°C +70°C -
RS stock no. 301-9502
Mfr. Part No.HAS 200S
BrandLEM
R 717.13
Each
units
600:1 20.4 x 10.4mm - - 30mm Open Loop 40mm 15 V 600A 30mm - -10°C +80°C -
RS stock no. 819-9798
Mfr. Part No.140AS
BrandEfergy
R 284.38
Each
units
- 19mm - - - - - - - - - - - -
RS stock no. 793-4581
Mfr. Part No.HLSR 32-P
BrandLEM
R 133.78
Each
units
80:1 - - - 12mm Open Loop 17.2mm 4.5 → 5.5 V 80A 21mm 32 A -40°C +105°C -