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Current Transformers

pCurrent 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./p pCurrent transformers can perform circuit control and perform roles for safety protection and current limiting./p p Current transformers are found in:/p ulliGenerating stations,/li liElectrical substations/li liCommercial electric power distribution./li/ul h2Types of Current Transformers/h2 pstrongToroidal Current Transformer/strong - 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./p pstrongWound Current Transformer/strong - 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./p pstrongBar-type Current Transformer/strong – 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./p

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Description Price Current Ratio Inner Diameter Transformer Type Overall Height Overall Width Overall Depth Input Current Output Current Minimum Temperature Maximum Temperature Dimensions For Use With Mounting Type Series
RS PRO Clip Fit Circuit Transformer, , 40 x 11mm diameter , 500A Input, 5 A Output, 500:5
RS Stock No. 171-8792
BrandRS PRO
MYR74.44
Each
units
 500:5 40 x 11mm Clip Fit 78mm 62mm 40mm 500A 5 A -5°C +55°C 62 x 40 x 78 mm - Surface Mount -
RS PRO Clip Fit Circuit Transformer, , 21 x 10mm diameter , 250A Input, 5 A Output, 250:5
RS Stock No. 171-8761
BrandRS PRO
MYR63.84
Each
units
 250:5 21 x 10mm Clip Fit 65mm 45mm 40mm 250A 5 A -5°C +55°C 45 x 40 x 65 mm - Surface Mount -
RS PRO Circuit Transformer, , 40 x 11mm diameter , 400:1
RS Stock No. 171-8790
BrandRS PRO
MYR123.44
Each
units
 400:1 40 x 11mm - 78mm 62mm 40mm - - - - 62 x 40 x 78 mm - - -
RS PRO Clip Fit Circuit Transformer, , 62 x 40mm diameter , 20A Input, 5 A Output, 20:5
RS Stock No. 171-8858
BrandRS PRO
MYR94.23
Each
units
 20:5 62 x 40mm Clip Fit 78mm 62mm 40mm 20A 5 A -5°C +55°C 62 x 40 x 78 mm - Surface Mount -
RS PRO Clip Fit Circuit Transformer, , 100 x 30mm diameter , 3kA Input, 5 A Output, 3000:5
RS Stock No. 171-8823
BrandRS PRO
MYR240.43
Each
units
 3000:5 100 x 30mm Clip Fit 155mm 140mm 45mm 3kA 5 A -5°C +55°C 140 x 45 x 155 mm - Surface Mount -
RS PRO Current Transformer, , 50 → 125A Input,
RS Stock No. 124-3891
BrandRS PRO
MYR15.10
Each
units
 - - - - - - 50 → 125A - -55°C +130°C 34.9 x 14.3 x 34.9 mm - PCB Mount -
RS PRO Current Transformer, , 50A Input,
RS Stock No. 173-0238
BrandRS PRO
MYR156.164
Each (In a Box of 220)
units
 - - - - - - 50A - -40°C +85°C 23.8 x 11.12 x 23.8 mm - PCB Mount -
RS PRO Clip Fit Circuit Transformer, , 21 x 10mm diameter , 50A Input, 5 A Output, 50:5
RS Stock No. 171-8750
BrandRS PRO
MYR60.04
Each
units
 50:5 21 x 10mm Clip Fit 65mm 45mm 40mm 50A 5 A -5°C +55°C 45 x 40 x 65 mm - Surface Mount -
RS PRO Base Mounted Circuit Transformer, , 55 x 43mm diameter , 600A Input, 5 A Output, 600:5
RS Stock No. 171-8854
BrandRS PRO
MYR254.51
Each
units
 600:5 55 x 43mm Base Mounted 125mm 108mm 51mm 600A 5 A +20°C +70°C 108 x 51 x 125 mm - Surface Mount -
RS PRO Circuit Transformer, , 21 x 10mm diameter , 100:1
RS Stock No. 171-8754
BrandRS PRO
MYR101.61
Each
units
 100:1 21 x 10mm - 65mm 45mm 40mm - - - - 45 x 40 x 65 mm - - -
RS PRO Clip Fit Circuit Transformer, , 30 x 10mm diameter , 300A Input, 5 A Output, 300:5
RS Stock No. 171-8775
BrandRS PRO
MYR58.23
Each
units
 300:5 30 x 10mm Clip Fit 70mm 50mm 31mm 300A 5 A -5°C +55°C 50 x 31 x 70 mm - Surface Mount -
RS PRO Current Transformer, , 5A Input,
RS Stock No. 173-0215
BrandRS PRO
MYR113.243
Each (In a Box of 351)
units
 - - - - - - 5A - -40°C +120°C 17.2 x 9.53 x 20.4 mm - PCB Mount -
RS PRO Current Transformer, , 100 → 250A Input,
RS Stock No. 173-0218
BrandRS PRO
MYR125.824
Each (In a Box of 25)
units
 - - - - - - 100 → 250A - -55°C +130°C 44.5 x 14.3 x 44.5 mm - PCB Mount -
RS PRO Current Transformer, , 25A Input,
RS Stock No. 124-3896
BrandRS PRO
MYR17.52
Each
units
 - - - - - - 25A - -40°C +85°C 19 x 11.5 x 21.5 mm - - -
RS PRO Current Transformer, , 7.5A Input,
RS Stock No. 124-3899
BrandRS PRO
MYR11.91
Each
units
 - - - - - - 7.5A - -40°C +120°C 17.2 x 9.53 x 20.4 mm - PCB Mount -
RS PRO Base Mounted Circuit Transformer, , 45mm diameter , 300A Input, 5 A Output, 300:5
RS Stock No. 171-8831
BrandRS PRO
MYR137.56
Each
units
 300:5 45mm Base Mounted 102.5mm 141mm 38mm 300A 5 A - - 141 x 38 x 102.5 mm MCCB Surface Mount -
RS PRO Clip Fit Circuit Transformer, , 30 x 10mm diameter , 150A Input, 5 A Output, 150:5
RS Stock No. 171-8769
BrandRS PRO
MYR57.53
Each
units
 150:5 30 x 10mm Clip Fit 70mm 50mm 31mm 150A 5 A -5°C +55°C 50 x 31 x 70 mm - Surface Mount -
RS PRO Clip Fit Circuit Transformer, , 21 x 10mm diameter , 60A Input, 5 A Output, 60:5
RS Stock No. 171-8751
BrandRS PRO
MYR60.04
Each
units
 60:5 21 x 10mm Clip Fit 65mm 45mm 40mm 60A 5 A -5°C +55°C 45 x 40 x 65 mm - Surface Mount -
RS PRO Base Mounted Circuit Transformer, , 55 x 43mm diameter , 500A Input, 5 A Output, 500:5
RS Stock No. 171-8852
BrandRS PRO
MYR254.51
Each
units
 500:5 55 x 43mm Base Mounted 125mm 108mm 51mm 500A 5 A +20°C +70°C 108 x 51 x 125 mm - Surface Mount -
RS PRO Clip Fit Circuit Transformer, , 30 x 10mm diameter , 600A Input, 5 A Output, 600:5
RS Stock No. 171-8779
BrandRS PRO
MYR67.08
Each
units
 600:5 30 x 10mm Clip Fit 70mm 50mm 31mm 600A 5 A -5°C +55°C 50 x 31 x 70 mm - Surface Mount -
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