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. 913-9734
FabrikantnummerMETSECT5CC013
33,64 €
Each
Aantal stuks
125:5 21mm Toroidal Ring - - - - - -25°C - +60°C - 65 x 44 x 30 mm -
RS-stocknr. 913-9731
FabrikantnummerMETSECT5CC005
29,82 €
Each
Aantal stuks
50:5 21mm Toroidal Ring - - - - - -25°C - +60°C - 65 x 44 x 30 mm -
RS-stocknr. 913-9738
FabrikantnummerMETSECT5CC020
34,64 €
Each
Aantal stuks
200:5 21mm Toroidal Ring - - - - - -25°C - +60°C - 65 x 44 x 30 mm -
RS-stocknr. 198-4500
FabrikantnummerMETSECT5MB040
91,80 €
Each
Aantal stuks
400:5 26mm Tropicalise - - 400A 5 A 85mm -25°C 60mm +60°C 63mm - -
RS-stocknr. 198-4496
FabrikantnummerMETSECT5MA040
86,69 €
Each
Aantal stuks
400:5 27mm Tropicalise - - 400A 5 A 80mm -25°C 56mm +60°C 63mm - -
RS-stocknr. 198-4485
FabrikantnummerMETSECT5DE100
153,99 €
Each
Aantal stuks
1000:5 - Tropicalise - - 1000A 5 A 129mm -25°C 135mm +50°C 85mm - -
RS-stocknr. 198-4464
FabrikantnummerMETSECT5CC015
69,76 €
Each
Aantal stuks
150:5 21mm Tropicalise - - 150A 5 A 65mm -25°C 44mm +60°C 37mm - -
RS-stocknr. 198-4478
FabrikantnummerMETSECT5DC200
223,75 €
Each
Aantal stuks
2000:5 - Tropicalise - - 2000A 5 A 160mm -25°C 125mm +50°C 87mm - -
RS-stocknr. 198-4467
FabrikantnummerMETSECT5DA080
120,39 €
Each
Aantal stuks
800:5 - Tropicalise - - 800A 5 A 94mm -25°C 90mm +60°C 87mm - -
RS-stocknr. 198-4471
FabrikantnummerMETSECT5DB100
173,38 €
Each
Aantal stuks
1000:5 - Tropicalise - - 1000A 5 A 160mm -25°C 99mm +60°C 78.4mm - -
RS-stocknr. 198-4497
FabrikantnummerMETSECT5MB025
88,20 €
Each
Aantal stuks
250:5 26mm Tropicalise - - 250A 5 A 85mm -25°C 60mm +60°C 63mm - -
RS-stocknr. 917-6531
FabrikantnummerLT6CT2001
71,17 €
Each
Aantal stuks
- - - - - - - - - - - - 107 x 95 x 25 mm -
RS-stocknr. 198-4504
FabrikantnummerMETSECT5MC050
112,38 €
Each
Aantal stuks
500:5 32mm Tropicalise - - 500A 5 A 95mm -25°C 70mm +60°C 65mm - -
RS-stocknr. 198-4484
FabrikantnummerMETSECT5DD150
165,47 €
Each
Aantal stuks
1500:5 - Tropicalise - - 1500A 5 A 116mm -25°C 96mm +50°C 78.4mm - -
RS-stocknr. 198-4463
FabrikantnummerMETSECT5CC010
67,45 €
Each
Aantal stuks
100:5 21mm Tropicalise - - 100A 5 A 65mm -25°C 44mm +60°C 37mm - -
RS-stocknr. 198-4468
FabrikantnummerMETSECT5DA100
125,50 €
Each
Aantal stuks
1000:5 - Tropicalise - - 1000A 5 A 94mm -25°C 90mm +60°C 87mm - -
RS-stocknr. 198-4503
FabrikantnummerMETSECT5MC040
110,19 €
Each
Aantal stuks
400:5 32mm Tropicalise - - 400A 5 A 95mm -25°C 70mm +60°C 65mm - -
RS-stocknr. 198-4483
FabrikantnummerMETSECT5DD125
157,15 €
Each
Aantal stuks
1250:5 - Tropicalise - - 1250A 5 A 116mm -25°C 96mm +50°C 78.4mm - -
RS-stocknr. 198-4482
FabrikantnummerMETSECT5DD100
157,08 €
Each
Aantal stuks
1000:5 - Tropicalise - - 1000A 5 A 116mm -25°C 96mm +50°C 78.4mm - -
RS-stocknr. 198-4472
FabrikantnummerMETSECT5DB125
182,53 €
Each
Aantal stuks
1250:5 - Tropicalise - - 1250A 5 A 160mm -25°C 99mm +60°C 78.4mm - -