Current Transformers

Current transformers or (CT’s) are instruments that are used to transform the current from a high current into a lower current so that the power can then be used for measuring and controlling. The transformers consist of a core, a primary and a secondary winding.RS Components offer an extensive range of highly accurate CT’s in various transformer types, current ratings, CT ratio supply voltages and mounting types to suit every application. Supplied by industry-leading brands including Siemens, Murata Power Solutions LEM and of course RS PRO.

How does a current transformer work?

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.

Types of current transformer

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.

Where would I use a current transformer?

CT's are used in a wide range of industrial and commercial measurement applications. Some of the most common are:Generating stationsElectrical substationsCommercial electric power distributionElectrical panels


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Description Price Current Ratio Bore Size Transformer Type Sensor Technology Supply Voltage Input Current Output Current Overall Height Minimum Temperature Overall Width Maximum Temperature Overall Depth Dimensions For Use With
RS Stock No. 123-6725
Mfr. Part No.XN45-315051S000000
MYR167.56
Each
units
400:5 31mm Base Mounted - - 400A 5 A - - - - - 141 x 38 x 102.5 mm MCCB
RS Stock No. 123-6724
Mfr. Part No.XN45-285051S000000
MYR167.56
Each
units
300:5 31mm Base Mounted - - 300A 5 A - - - - - 141 x 38 x 102.5 mm MCCB
RS Stock No. 886-2124
Mfr. Part No.XM02-185071S000000
MYR66.16
Each
units
100:5 21mm Base Mounted - - - - - - - - - 45 x 40 x 65 mm -
RS Stock No. 123-6730
Mfr. Part No.XS01-225221S 000000
MYR209.44
Each
units
150:5 33 x 23mm Clip Fit - - - - - - - - - 93 x 40 x 106 mm -
RS Stock No. 123-6728
Mfr. Part No.XN45-345051S000000
MYR167.56
Each
units
630:5 31mm Base Mounted - - 630A 5 A - - - - - 141 x 38 x 102.5 mm MCCB
RS Stock No. 886-2099
Mfr. Part No.XW01-045081S000000
MYR103.90
Each
units
5:5 - Base Mounted - - - - - - - - - 62 x 40 x 78 mm -
RS Stock No. 123-6740
Mfr. Part No.XS03-395115S 000000
MYR410.54
Each
units
1000:5 120 x 80mm Clip Fit - - - - - - - - - 155 x 40 x 198 mm -
RS Stock No. 123-6732
Mfr. Part No.XS01-275071S 000000
MYR242.98
Each
units
250:5 - Base Mounted - - 250A 5 A - +20°C - +70°C - - -
RS Stock No. 886-2118
Mfr. Part No.XM02-135031S000000
MYR66.16
Each
units
50:5 21mm Base Mounted - - - - - - - - - 45 x 40 x 65 mm -
RS Stock No. 886-2102
Mfr. Part No.XW01-075081S000000
MYR103.90
Each
units
15:5 - Base Mounted - - - - - - - - - 62 x 40 x 78 mm -
RS Stock No. 886-2168
Mfr. Part No.XM13-375111S000000
MYR87.16
Each
units
800:5 40mm Base Mounted - - - - - - - - - 62 x 40 x 78 mm -
RS Stock No. 886-2229
Mfr. Part No.XM24-395135S000000
MYR190.99
Each
units
1000:5 100mm Base Mounted - - - - - - - - - 140 x 45 x 155 mm -
RS Stock No. 123-6739
Mfr. Part No.XS03-375105S 000000
MYR424.87
Each
units
800:5 120 x 80mm Clip Fit - - - - - - - - - 155 x 40 x 198 mm -
RS Stock No. 886-2203
Mfr. Part No.XM20-375141S000000
MYR149.97
Each
units
800:5 60mm Base Mounted - - - - - - - - - 86 x 45 x 110 mm -
RS Stock No. 123-6727
Mfr. Part No.XN45-335051S000000
MYR167.56
Each
units
600:5 31mm Base Mounted - - 600A 5 A - - - - - 141 x 38 x 102.5 mm MCCB
RS Stock No. 886-2134
Mfr. Part No.XM02-285081S000000
MYR70.36
Each
units
300:5 21mm Base Mounted - - - - - - - - - 45 x 40 x 65 mm -
RS Stock No. 123-6714
Mfr. Part No.XN25-225031S000000
MYR192.70
Each
units
150:5 31mm Base Mounted - - 150A 5 A - - - - - 75 x 60 x 87.5 mm MCCB
RS Stock No. 886-2130
Mfr. Part No.XM02-245081S000000
MYR59.31
Each
units
200:5 21mm Base Mounted - - - - - - - - - 45 x 40 x 65 mm -
RS Stock No. 886-2112
Mfr. Part No.XM02-145031S000000
MYR66.16
Each
units
60:5 21mm Base Mounted - - - - - - - - - 45 x 40 x 65 mm -
RS Stock No. 123-6729
Mfr. Part No.XS01-185031S 000000
MYR190.46
Each
units
100:5 33 x 23mm Clip Fit - - - - - - - - - 93 x 40 x 106 mm -