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. 173-0068
FabrikantnummerAZ-1000
FabrikantNuvotem Talema
4,267 €
Each (In a Box of 84)
Aantal stuks
1000:1 - - - - 50A - - -40°C - +85°C - 19.0 x 11.5 x 21.5 mm -
RS-stocknr. 775-4912
FabrikantnummerAZ-1000
FabrikantNuvotem Talema
5,54 €
Each
Aantal stuks
1000:1 - - - - 50A - - -40°C - +85°C - 19.0 x 11.5 x 21.5 mm -
RS-stocknr. 715-7989
Fabrikantnummer2308030
FabrikantPhoenix Contact
211,21 €
Each
Aantal stuks
200:1 32mm - - 20 → 30 V dc 200A 4 → 20 mA 70mm -40°C 90mm +65°C 33.8mm - -
RS-stocknr. 207-2877
FabrikantnummerHTA 100-S
FabrikantLEM
57,39 €
Each
Aantal stuks
300:1 32mm - Open Loop 15 V 300A - 70mm -25°C 90mm +85°C 27.5mm - -
RS-stocknr. 173-0049
FabrikantnummerAC-1030
FabrikantNuvotem Talema
2,973 €
Each (In a Box of 120)
Aantal stuks
30:1 - - - - 30A - - -40°C - +120°C - 30.2 x 14.3 x 30.2 mm -
RS-stocknr. 729-5501
FabrikantnummerAC-1030
FabrikantNuvotem Talema
3,79 €
Each
Aantal stuks
30:1 - - - - 30A - - -40°C - +120°C - 30.2 x 14.3 x 30.2 mm -
RS-stocknr. 521-936
FabrikantnummerHASS 400-S
FabrikantLEM
17,80 €
Each
Aantal stuks
900:1 20.4 x 10.4mm - Open Loop 5 V 900A - 30mm -40°C 40mm +85°C 30mm - -
RS-stocknr. 499-5356
FabrikantnummerLTSR 6-NP
FabrikantLEM
15,04 €
Each
Aantal stuks
19.2:1 3.2mm - Closed Loop 5 V 19.2A - 24mm -40°C 22.2mm +85°C 10mm - -
RS-stocknr. 286-311
FabrikantnummerLA 25-NP
FabrikantLEM
21,78 €
Each
Aantal stuks
36:1 - - Closed Loop 15 V 36A 25 mArms 16.45mm -40°C 26mm +85°C 29.2mm - -
RS-stocknr. 819-9779
Fabrikantnummer90AS
FabrikantEfergy
11,22 €
Each
Aantal stuks
- 12mm Split Core - - - - - - - - - - Data Loggers/DAS, Digital or Analog Meters, DMMs, Recorders
RS-stocknr. 451-1374
FabrikantnummerLF 306S
FabrikantLEM
89,29 €
Each
Aantal stuks
500:1 25.5mm - Closed Loop 12 → 15 V 500A 150 mArms 57.4mm -25°C 67.3mm +70°C 15.7mm - -
RS-stocknr. 775-2714
FabrikantnummerCTSCMICRO19-200/5-T-S
FabrikantHOBUT
50,81 €
Each
Aantal stuks
200:5 - Split Core - - - - 78mm -30°C 58mm +55°C 49mm - -
RS-stocknr. 527-8602
FabrikantnummerDHR 1000 C420
FabrikantLEM
265,31 €
Each
Aantal stuks
1000:1 32mm - Open Loop 20 → 50 V dc 1000A 4 → 20 mA 70mm -40°C 90mm +70°C 25mm - -
RS-stocknr. 499-5586
FabrikantnummerAP 200 B420L
FabrikantLEM
132,34 €
Each
Aantal stuks
200:1 18mm - - 12 → 24 V dc 200A 4 → 20 mA 69mm -20°C 67mm +60°C 55mm - -
RS-stocknr. 499-5564
FabrikantnummerAP 50 B420L
FabrikantLEM
128,26 €
Each
Aantal stuks
50:1 18mm - - 12 → 24 V dc 50A 4 → 20 mA 69mm -20°C 67mm +60°C 55mm - -
RS-stocknr. 497-198
FabrikantnummerHASS 100-S
FabrikantLEM
17,03 €
Each
Aantal stuks
300:1 20.4 x 10.4mm - Open Loop 5 V 300A - 30mm -40°C 40mm +85°C 30mm - -
RS-stocknr. 532-9097
FabrikantnummerHXS 20-NP
FabrikantLEM
8,64 €
Each
Aantal stuks
60:1 - - Open Loop 5 V 60A - 10.7mm -40°C 16.7mm +105°C 18.7mm - -
RS-stocknr. 499-5570
FabrikantnummerAP 100 B420L
FabrikantLEM
132,34 €
Each
Aantal stuks
100:1 18mm - - 12 → 24 V dc 100A 4 → 20 mA 69mm -20°C 67mm +60°C 55mm - -
RS-stocknr. 173-0066
FabrikantnummerAZ-0500
FabrikantNuvotem Talema
3,972 €
Each (In a Box of 84)
Aantal stuks
500:1 - - - - 25A - - -40°C - +85°C - 19.0 x 11.5 x 21.5 mm -
RS-stocknr. 775-4909
FabrikantnummerAZ-0500
FabrikantNuvotem Talema
5,23 €
Each
Aantal stuks
500:1 - - - - 25A - - -40°C - +85°C - 19.0 x 11.5 x 21.5 mm -