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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Omschrijving Prijs 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-stocknr. 171-8772
FabrikantRS PRO
16,57 €
Each
Aantal stuks
250:1 30 x 10mm - - - - - 70mm - 50mm - 30mm 50 x 30 x 70 mm -
RS-stocknr. 124-3896
FabrikantRS PRO
3,43 €
Each
Aantal stuks
500:1 7mm - - - 25A - - -40°C - +85°C - 19 x 11.5 x 21.5 mm -
RS-stocknr. 124-3903
FabrikantRS PRO
1,39 €
Each
Aantal stuks
1000:1 5mm - - - 120A - - -40°C - +85°C - 17.2 x 9.53 x 20.4 mm -
RS-stocknr. 171-8755
FabrikantRS PRO
12,01 €
Each
Aantal stuks
100:5 21 x 10mm Clip Fit - - 100A 5 A 65mm -5°C 45mm +55°C 40mm 45 x 40 x 65 mm -
RS-stocknr. 173-0219
FabrikantRS PRO
3,056 €
Each (In a Box of 18)
Aantal stuks
1000:1 23.8mm - - - 500A - - -55°C - +130°C - 55.6 x 20.6 x 55.6 mm -
RS-stocknr. 171-8814
FabrikantRS PRO
33,43 €
Each
Aantal stuks
1250:5 80 x 12mm Clip Fit - - 1250A 5 A 126mm -5°C 104mm +55°C 45mm 104 x 45 x 126 mm -
RS-stocknr. 173-0198
FabrikantRS PRO
3,706 €
Each (In a Box of 176)
Aantal stuks
1000:1 11.4mm - - - 375A - - -55°C - +130°C - 30.2 x 14.3 x 30.2 mm -
RS-stocknr. 171-8848
FabrikantRS PRO
37,99 €
Each
Aantal stuks
200:5 33 x 23mm Base Mounted - - 200A 5 A 106mm +20°C 93mm +70°C 40mm 93 x 40 x 106 mm -
RS-stocknr. 173-0200
FabrikantRS PRO
1,826 €
Each (In a Box of 133)
Aantal stuks
1000:1 14.6mm - - - 125A - - -55°C - +130°C - 34.9 x 14.3 x 34.9 mm -
RS-stocknr. 171-8767
FabrikantRS PRO
15,95 €
Each
Aantal stuks
- - - - - - - - - - - - - -
RS-stocknr. 171-8830
FabrikantRS PRO
30,39 €
Each
Aantal stuks
250:5 45mm Base Mounted - - 250A 5 A 102.5mm - 141mm - 38mm 141 x 38 x 102.5 mm MCCB
RS-stocknr. 171-8791
FabrikantRS PRO
14,90 €
Each
Aantal stuks
400:5 40 x 11mm Clip Fit - - 400A 5 A 78mm -5°C 62mm +55°C 40mm 62 x 40 x 78 mm -
RS-stocknr. 124-3902
FabrikantRS PRO
3,11 €
Each
Aantal stuks
2500:1 9.5mm - - - 50A - - -40°C - +85°C - 23.8 x 11.12 x 23.8 mm -
RS-stocknr. 171-8850
FabrikantRS PRO
45,57 €
Each
Aantal stuks
300:5 33 x 23mm Base Mounted - - 300A 5 A 106mm +20°C 93mm +70°C 40mm 93 x 40 x 106 mm -
RS-stocknr. 171-8847
FabrikantRS PRO
37,99 €
Each
Aantal stuks
150:5 33 x 23mm Base Mounted - - 150A 5 A 106mm +20°C 93mm +70°C 40mm 93 x 40 x 106 mm -
RS-stocknr. 171-8841
FabrikantRS PRO
62,45 €
Each
Aantal stuks
1250:5 101 x 56mm Clip Fit - - 1250A 5 A 170mm -5°C 130mm +55°C 60mm 130 x 60 x 170 mm -
RS-stocknr. 171-8813
FabrikantRS PRO
29,61 €
Each
Aantal stuks
1200:5 80 x 12mm Clip Fit - - 1200A 5 A 126mm -5°C 104mm +55°C 45mm 104 x 45 x 126 mm -
RS-stocknr. 171-8846
FabrikantRS PRO
37,99 €
Each
Aantal stuks
100:5 33 x 23mm Base Mounted - - 100A 5 A 106mm +20°C 93mm +70°C 40mm 93 x 40 x 106 mm -
RS-stocknr. 173-0236
FabrikantRS PRO
1,638 €
Each (In a Box of 351)
Aantal stuks
1500:1 5mm - - - 15A - - -40°C - +120°C - 17.2 x 9.53 x 20.4 mm -
RS-stocknr. 171-8832
FabrikantRS PRO
30,39 €
Each
Aantal stuks
400:5 45mm Base Mounted - - 400A 5 A 102.5mm - 141mm - 38mm 141 x 38 x 102.5 mm MCCB