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. 181-0001
Mfr. Part No.MR-4
BrandKEMET
SGD23.87
Each (In a Box of 50)
units
- 16.5mm - - - - - - - - - - - -
RS Stock No. 181-0081
Mfr. Part No.MR-4
BrandKEMET
SGD31.29
Each
units
- 16.5mm - - - - - - - - - - - -
RS Stock No. 181-0083
Mfr. Part No.MR-1-P5
BrandKEMET
SGD14.17
Each
units
- 7.4mm - - - - - - - - - - - -
New
RS Stock No. 205-5834
Mfr. Part No.MR/C-01B
BrandKEMET
SGD6.356
Each (In a Box of 120)
units
1:1000 6mm - - - 15A 15 μA 6.7mm - 19mm - - - -
RS Stock No. 180-9997
Mfr. Part No.MR-1
BrandKEMET
SGD14.541
Each (In a Box of 80)
units
- 7.2mm - - - - - - - - - - - -
RS Stock No. 181-0075
Mfr. Part No.MR-1
BrandKEMET
SGD18.59
Each
units
- 7.2mm - - - - - - - - - - - -
RS Stock No. 181-0085
Mfr. Part No.MR/C-01
BrandKEMET
SGD7.06
Each
units
- 6mm - - - - - - - - - - - -
RS Stock No. 181-0003
Mfr. Part No.MR/C-01
BrandKEMET
SGD5.15
Each (In a Box of 120)
units
- 6mm - - - - - - - - - - - -
RS Stock No. 180-9999
Mfr. Part No.MR-3
BrandKEMET
SGD19.67
Each (In a Box of 50)
units
- 11mm - - - - - - - - - - - -
RS Stock No. 181-0077
Mfr. Part No.MR-2
BrandKEMET
SGD19.49
Each
units
- 8.9mm - - - - - - - - - - - -
RS Stock No. 181-0002
Mfr. Part No.MR-1-P5
BrandKEMET
SGD10.526
Each (In a Box of 150)
units
- 7.4mm - - - - - - - - - - - -
New
RS Stock No. 205-5835
Mfr. Part No.MR/C-01B
BrandKEMET
SGD13.87
Each
units
1:1000 6mm - - - 15A 15 μA 6.7mm - 19mm - - - -
RS Stock No. 181-0079
Mfr. Part No.MR-3
BrandKEMET
SGD27.50
Each
units
- 11mm - - - - - - - - - - - -
RS Stock No. 180-9998
Mfr. Part No.MR-2
BrandKEMET
SGD14.12
Each (In a Box of 80)
units
- 8.9mm - - - - - - - - - - - -