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. 173-0181
FabrikantRS PRO
€ 2,953
Each (In a Box of 351)
Aantal stuks
10:1 5mm - - - 10A - - -40°C - +120°C - 17.2 x 9.53 x 20.4 mm -
RS-stocknr. 173-0215
FabrikantRS PRO
€ 1,795
Each (In a Box of 351)
Aantal stuks
500:1 5mm - - - 5A - - -40°C - +120°C - 17.2 x 9.53 x 20.4 mm -
RS-stocknr. 124-3882
FabrikantRS PRO
€ 3,60
Each
Aantal stuks
10:1 5mm - - - 10A - - -40°C - +120°C - 17.2 x 9.53 x 20.4 mm -
RS-stocknr. 124-3898
FabrikantRS PRO
€ 1,99
Each
Aantal stuks
500:1 5mm - - - 5A - - -40°C - +120°C - 17.2 x 9.53 x 20.4 mm -
RS-stocknr. 124-3895
FabrikantRS PRO
€ 4,94
Each
Aantal stuks
1000:1 23.8mm - - - 200A - - -55°C - +130°C - 55.6 x 20.6 x 55.6 mm -
RS-stocknr. 124-3883
FabrikantRS PRO
€ 1,84
Each
Aantal stuks
50:1 8mm - - - 50A - - -40°C - +120°C - 32 x 20.5 x 35 mm -
RS-stocknr. 124-3897
FabrikantRS PRO
€ 3,85
Each
Aantal stuks
1000:1 7mm - - - 50A - - -40°C - +85°C - 19 x 11.5 x 21.5 mm -
RS-stocknr. 173-0219
FabrikantRS PRO
€ 3,806
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. 124-3899
FabrikantRS PRO
€ 4,35
Each
Aantal stuks
750:1 5mm - - - 7.5A - - -40°C - +120°C - 17.2 x 9.53 x 20.4 mm -
RS-stocknr. 173-0216
FabrikantRS PRO
€ 1,495
Each (In a Box of 351)
Aantal stuks
750:1 5mm - - - 7.5A - - -40°C - +120°C - 17.2 x 9.53 x 20.4 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. 173-0184
FabrikantRS PRO
€ 1,806
Each (In a Box of 98)
Aantal stuks
50:1 8mm - - - 50A - - -40°C - +120°C - 32 x 20.5 x 35 mm -
RS-stocknr. 173-0220
FabrikantRS PRO
€ 3,084
Each (In a Box of 140)
Aantal stuks
500:1 7mm - - - 25A - - -40°C - +85°C - 19 x 11.5 x 21.5 mm -
RS-stocknr. 171-8749
FabrikantRS PRO
€ 18,34
Each
Aantal stuks
50:1 21 x 10mm - - - - - 65mm - 45mm - 40mm 45 x 40 x 65 mm -
RS-stocknr. 124-3889
FabrikantRS PRO
€ 1,86
Each
Aantal stuks
1000:1 11.4mm - - - 75A - - -55°C - +130°C - 30.2 x 14.3 x 30.2 mm -
RS-stocknr. 171-8821
FabrikantRS PRO
€ 43,14
Each
Aantal stuks
2000:5 100 x 30mm Clip Fit - - 2000A 5 A 155mm -5°C 140mm +55°C 45mm 140 x 45 x 155 mm -
RS-stocknr. 171-8848
FabrikantRS PRO
€ 39,89
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 -
Nieuw
RS-stocknr. 210-0643
FabrikantRS PRO
€ 57,65
Each
Aantal stuks
- - Split Core - - 50A - 51mm -20°C - +65°C 26.5mm - -
RS-stocknr. 171-8789
FabrikantRS PRO
€ 14,28
Each
Aantal stuks
300:5 40 x 11mm Clip Fit - - 300A 5 A 78mm -5°C 62mm +55°C 40mm 62 x 40 x 78 mm -
RS-stocknr. 171-8849
FabrikantRS PRO
€ 46,27
Each
Aantal stuks
250:5 33 x 23mm Base Mounted - - 250A 5 A 106mm +20°C 93mm +70°C 40mm 93 x 40 x 106 mm -