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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Siemens 5SV, Current Transformer, , 200A Input, 30 mA Output
  • € 216,72
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Siemens 5SV, Current Transformer, , 250A Input, 100 mA Output
  • € 298,39
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Siemens 5SV, Current Transformer, , 500A Input, 300 mA Output
  • € 505,71
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Siemens 5SV, Current Transformer, , 630A Input, 300 mA Output
  • € 807,76
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Siemens 5SV, Current Transformer, , 63A Input, 30 mA Output
  • € 165,64
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Siemens SIRIUS, Straight Through Current Transformer, , 10 - 100A
  • € 120,88
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Siemens SIRIUS, Straight Through Current Transformer, , 63 - 630
  • € 485,97
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KEMET MR, Current Transformer
  • € 5,44
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KEMET MR, Current Transformer, , 6mm diameter , 15A Input, 15 μA Output, 1:1000
  • € 3,84
  • Buc. (Intr-o cutie de 120)
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KEMET MR, Current Transformer
  • € 2,71
  • Buc. (Intr-o cutie de 120)
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LEM DVC, Current Transformer
  • € 72,70
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  • Nr. Stoc RS 177-4931
  • Marca LEM
  • Cod Producator DVC 1000-P
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LEM LKSR, Current Transformer, , 20A Input, 20:1
  • € 13,27
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  • Nr. Stoc RS 200-3817
  • Marca LEM
  • Cod Producator LKSR 6-NP
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KEMET MR, Current Transformer
  • € 7,57
  • Buc. (Intr-o cutie de 80)
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KEMET MR, Current Transformer
  • € 9,94
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KEMET MR, Current Transformer
  • € 8,56
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LEM LESR, Current Transformer, , 25A Input, 25:1
  • € 13,27
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  • Nr. Stoc RS 200-3808
  • Marca LEM
  • Cod Producator LESR 25-NP
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