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 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 Stock No. 123-6725
Mfr. Part No.XN45-315051S000000
MYR153.75
Each
units
400:5 31mm Base Mounted - - - 400A 5 A - - 141 x 38 x 102.5 mm MCCB BusBar, DIN Rail, Plug In Omega
RS Stock No. 123-6724
Mfr. Part No.XN45-285051S000000
MYR153.75
Each
units
300:5 31mm Base Mounted - - - 300A 5 A - - 141 x 38 x 102.5 mm MCCB BusBar, DIN Rail, Plug In Omega
RS Stock No. 886-2124
Mfr. Part No.XM02-185071S000000
MYR63.83
Each
units
100:5 21mm Base Mounted - - - - - - - 45 x 40 x 65 mm - Surface Mount Omega XMER
RS Stock No. 123-6730
Mfr. Part No.XS01-225221S 000000
MYR196.01
Each
units
150:5 33 x 23mm Clip Fit - - - - - - - 93 x 40 x 106 mm - Surface Mount Omega10
RS Stock No. 886-2099
Mfr. Part No.XW01-045081S000000
MYR100.16
Each
units
5:5 - Base Mounted - - - - - - - 62 x 40 x 78 mm - Surface Mount Omega XMER
RS Stock No. 123-6728
Mfr. Part No.XN45-345051S000000
MYR144.04
Each
units
630:5 31mm Base Mounted - - - 630A 5 A - - 141 x 38 x 102.5 mm MCCB BusBar, DIN Rail, Plug In Omega
RS Stock No. 123-6732
Mfr. Part No.XS01-275071S 000000
MYR188.03
Each
units
250:5 - Base Mounted - - - 250A 5 A +20°C +70°C - - Plug In Omega
RS Stock No. 123-6740
Mfr. Part No.XS03-395115S 000000
MYR326.78
Each
units
1000:5 120 x 80mm Clip Fit - - - - - - - 155 x 40 x 198 mm - Surface Mount Omega10
RS Stock No. 886-2102
Mfr. Part No.XW01-075081S000000
MYR100.16
Each
units
15:5 - Base Mounted - - - - - - - 62 x 40 x 78 mm - Surface Mount Omega XMER
RS Stock No. 886-2118
Mfr. Part No.XM02-135031S000000
MYR63.83
Each
units
50:5 21mm Base Mounted - - - - - - - 45 x 40 x 65 mm - Surface Mount Omega XMER
RS Stock No. 886-2134
Mfr. Part No.XM02-285081S000000
MYR67.88
Each
units
300:5 21mm Base Mounted - - - - - - - 45 x 40 x 65 mm - Surface Mount Omega XMER
RS Stock No. 123-6727
Mfr. Part No.XN45-335051S000000
MYR132.04
Each
units
600:5 31mm Base Mounted - - - 600A 5 A - - 141 x 38 x 102.5 mm MCCB BusBar, DIN Rail, Plug In Omega
RS Stock No. 123-6739
Mfr. Part No.XS03-375105S 000000
MYR326.78
Each
units
800:5 120 x 80mm Clip Fit - - - - - - - 155 x 40 x 198 mm - Surface Mount Omega10
RS Stock No. 886-2112
Mfr. Part No.XM02-145031S000000
MYR63.83
Each
units
60:5 21mm Base Mounted - - - - - - - 45 x 40 x 65 mm - Surface Mount Omega XMER
RS Stock No. 123-6731
Mfr. Part No.XS01-245051S 000000
MYR196.01
Each
units
200:5 33 x 23mm Clip Fit - - - - - - - 93 x 40 x 106 mm - Surface Mount Omega10
RS Stock No. 886-2203
Mfr. Part No.XM20-375141S000000
MYR107.91
Each
units
800:5 60mm Base Mounted - - - - - - - 86 x 45 x 110 mm - Surface Mount Omega XMER
RS Stock No. 123-6714
Mfr. Part No.XN25-225031S000000
MYR165.61
Each
units
150:5 31mm Base Mounted - - - 150A 5 A - - 75 x 60 x 87.5 mm MCCB BusBar, DIN Rail, Plug In Omega
RS Stock No. 886-2130
Mfr. Part No.XM02-245081S000000
MYR67.88
Each
units
200:5 21mm Base Mounted - - - - - - - 45 x 40 x 65 mm - Surface Mount Omega XMER
RS Stock No. 886-2121
Mfr. Part No.XM02-175051S000000
MYR63.83
Each
units
80:5 21mm Base Mounted - - - - - - - 45 x 40 x 65 mm - Surface Mount Omega XMER
RS Stock No. 123-6738
Mfr. Part No.XS02-375105S 000000
MYR236.45
Each
units
800:5 80 x 50mm Clip Fit - - - - - - - 125 x 40 x 158 mm - Surface Mount Omega10