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. 189-5477
Mfr. Part No.CSNE151
BrandHoneywell
SGD54.24
Each
units
36:1 - - - 28mm Closed Loop 28mm 15 V 36A 16.8mm 25 mA 0°C +70°C -
RS Stock No. 181-2129
Mfr. Part No.CSLA2CD
BrandHoneywell
SGD32.43
Each
units
- 10.9mm - - - Open Loop - 6 → 12 V dc - - - - - -
RS Stock No. 477-4711
Mfr. Part No.CSNS300M
BrandHoneywell
SGD155.68
Each
units
600:1 26mm - - 61.2mm Closed Loop 67.5mm 15 V 600A 19mm 150 mA -40°C +85°C -
RS Stock No. 667-3437
Mfr. Part No.CSDA1DA
BrandHoneywell
SGD36.92
Each
units
1:1 10.9mm - - 19mm Open Loop 31.8mm 6 → 16 V dc 1A 25.4mm 20 mA -25°C +85°C -
RS Stock No. 181-2135
Mfr. Part No.CSLA2DG
BrandHoneywell
SGD38.67
Each
units
- 15.7mm - - - Open Loop - 6 → 12 V dc - - - - - -
RS Stock No. 650-560
Mfr. Part No.CSLA1CF
BrandHoneywell
SGD36.58
Each
units
- 10.9mm - - - Open Loop - 8 → 16 V dc - - - - - -
RS Stock No. 169-7652
Mfr. Part No.CSLA1CF
BrandHoneywell
SGD30.544
Each (In a Box of 50)
units
100:1 10.9mm - - 35.6mm Open Loop 34.3mm 8 → 16 V dc 100A 10.4mm - -25°C +85°C -
RS Stock No. 181-2141
Mfr. Part No.CSNP661
BrandHoneywell
SGD54.88
Each
units
90:1 - - - 29.6mm Closed Loop 36.6mm 12 → 15 V dc 90A 14.45mm 50 mA -40°C +85°C -
RS Stock No. 650-554
Mfr. Part No.CSLA1CD
BrandHoneywell
SGD30.05
Each
units
- 10.9mm - - - Open Loop - 8 → 16 V dc - - - - - -
RS Stock No. 667-3459
Mfr. Part No.CSNE151-104
BrandHoneywell
SGD22.49
Each
units
56:1 - - - 20.3mm Closed Loop 31.75mm 15 V dc 56A 12.7mm 12.5 mA -40°C +75°C -
RS Stock No. 169-7656
Mfr. Part No.CSLA2DK
BrandHoneywell
SGD50.844
Each (In a Box of 50)
units
- - - - 44.5mm - 35.6mm 6 → 12 V dc - 14.2mm Maximum of 400 A -25°C +85°C -
RS Stock No. 121-8174
Mfr. Part No.CSLW6B200M
BrandHoneywell
SGD30.31
Each
units
9:1 - - - 10mm - 16.2mm 4.5 → 10.5 V dc 9A - -200 → +200 mA -25°C +100°C -
RS Stock No. 667-3455
Mfr. Part No.CSNE151-100
BrandHoneywell
SGD51.91
Each
units
90:1 - - - 20.3mm Closed Loop 31.75mm 12 → 15 V dc 90A 12.7mm 25 mA -40°C +85°C -
RS Stock No. 169-7681
Mfr. Part No.CSNE151-104
BrandHoneywell
SGD19.816
Each (In a Box of 40)
units
56:1 - - - 20.3mm Closed Loop 31.75mm 15 V dc 56A 12.7mm 12.5 mA -40°C +75°C -
RS Stock No. 121-8175
Mfr. Part No.CSNA111
BrandHoneywell
SGD47.20
Each
units
60 mA - - - 25.7mm Closed Loop 40.5mm ±15 V 60mA 18mm -70 → +70 A 0°C +70°C -
RS Stock No. 477-4749
Mfr. Part No.CSNS300F
BrandHoneywell
SGD173.68
Each
units
600:1 26mm - - 61.2mm Closed Loop 67.5mm 15 V 600A 17.9mm 150 mA -40°C +85°C -
RS Stock No. 169-7653
Mfr. Part No.CSNA111
BrandHoneywell
SGD40.971
Each (In a Box of 30)
units
60 mA - - - 25.7mm Closed Loop 40.5mm ±15 V 60mA 18mm -70 → +70 A 0°C +70°C -
RS Stock No. 169-7654
Mfr. Part No.CSLA2EL
BrandHoneywell
SGD53.518
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. 181-1429
Mfr. Part No.CSNT651
BrandHoneywell
SGD64.10
Each
units
150:1 12.5 x 9mm - - 29.6mm Closed Loop 36.6mm 12 → 15 V dc 150A 14.45mm 25 mA -40°C +85°C -
RS Stock No. 177-5952
Mfr. Part No.CSLA1CD
BrandHoneywell
SGD25.013
Each (In a Tray of 50)
units
- - - - - - - - - - - - - -