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. 181-1429
FabrikantnummerCSNT651
FabrikantHoneywell
36,40 €
Each
Aantal stuks
150:1 12.5 x 9mm - Closed Loop 12 → 15 V dc 150A 25 mA 29.6mm -40°C 36.6mm +85°C 14.45mm - -
RS-stocknr. 169-7681
FabrikantnummerCSNE151-104
FabrikantHoneywell
13,103 €
Each (In a Box of 40)
Aantal stuks
56:1 - - Closed Loop 15 V dc 56A 12.5 mA 20.3mm -40°C 31.75mm +75°C 12.7mm - -
RS-stocknr. 477-4749
FabrikantnummerCSNS300F
FabrikantHoneywell
99,52 €
Each
Aantal stuks
600:1 26mm - Closed Loop 15 V 600A 150 mA 61.2mm -40°C 67.5mm +85°C 17.9mm - -
RS-stocknr. 121-8178
FabrikantnummerCSLA2EL
FabrikantHoneywell
44,74 €
Each
Aantal stuks
20:1 - - - 6 → 12 V dc 20A Maximum of 550 A 57.4mm -25°C 44.4mm +85°C 15.7mm - -
RS-stocknr. 189-5477
FabrikantnummerCSNE151
FabrikantHoneywell
30,55 €
Each
Aantal stuks
36:1 - - Closed Loop 15 V 36A 25 mA 28mm 0°C 28mm +70°C 16.8mm - -
RS-stocknr. 169-7652
FabrikantnummerCSLA1CF
FabrikantHoneywell
22,054 €
Each (In a Box of 50)
Aantal stuks
100:1 10.9mm - Open Loop 8 → 16 V dc 100A - 35.6mm -25°C 34.3mm +85°C 10.4mm - -
RS-stocknr. 181-2135
FabrikantnummerCSLA2DG
FabrikantHoneywell
29,46 €
Each
Aantal stuks
- 15.7mm - Open Loop 6 → 12 V dc - - - - - - - - -
RS-stocknr. 121-8174
FabrikantnummerCSLW6B200M
FabrikantHoneywell
19,02 €
Each
Aantal stuks
9:1 - - - 4.5 → 10.5 V dc 9A -200 → +200 mA 10mm -25°C 16.2mm +100°C - - -
RS-stocknr. 650-554
FabrikantnummerCSLA1CD
FabrikantHoneywell
24,93 €
Each
Aantal stuks
- 10.9mm - Open Loop 8 → 16 V dc - - - - - - - - -
RS-stocknr. 667-3459
FabrikantnummerCSNE151-104
FabrikantHoneywell
16,03 €
Each
Aantal stuks
56:1 - - Closed Loop 15 V dc 56A 12.5 mA 20.3mm -40°C 31.75mm +75°C 12.7mm - -
RS-stocknr. 477-4711
FabrikantnummerCSNS300M
FabrikantHoneywell
107,67 €
Each
Aantal stuks
600:1 26mm - Closed Loop 15 V 600A 150 mA 61.2mm -40°C 67.5mm +85°C 19mm - -
RS-stocknr. 181-2141
FabrikantnummerCSNP661
FabrikantHoneywell
40,04 €
Each
Aantal stuks
90:1 - - Closed Loop 12 → 15 V dc 90A 50 mA 29.6mm -40°C 36.6mm +85°C 14.45mm - -
RS-stocknr. 181-2129
FabrikantnummerCSLA2CD
FabrikantHoneywell
23,65 €
Each
Aantal stuks
- 10.9mm - Open Loop 6 → 12 V dc - - - - - - - - -
RS-stocknr. 667-3437
FabrikantnummerCSDA1DA
FabrikantHoneywell
31,55 €
Each
Aantal stuks
1:1 10.9mm - Open Loop 6 → 16 V dc 1A 20 mA 19mm -25°C 31.8mm +85°C 25.4mm - -
RS-stocknr. 667-3474
FabrikantnummerCSNR151
FabrikantHoneywell
53,37 €
Each
Aantal stuks
200:1 - - Closed Loop 12 → 15 V dc 200A 62.5 mA 29.6mm -40°C 36.6mm +85°C 14.45mm - -
RS-stocknr. 169-7656
FabrikantnummerCSLA2DK
FabrikantHoneywell
34,28 €
Each (In a Box of 50)
Aantal stuks
- - - - 6 → 12 V dc - Maximum of 400 A 44.5mm -25°C 35.6mm +85°C 14.2mm - -
RS-stocknr. 177-5952
FabrikantnummerCSLA1CD
FabrikantHoneywell
18,236 €
Each (In a Tray of 50)
Aantal stuks
- - - - - - - - - - - - - -
RS-stocknr. 667-3455
FabrikantnummerCSNE151-100
FabrikantHoneywell
37,89 €
Each
Aantal stuks
90:1 - - Closed Loop 12 → 15 V dc 90A 25 mA 20.3mm -40°C 31.75mm +85°C 12.7mm - -
RS-stocknr. 121-8175
FabrikantnummerCSNA111
FabrikantHoneywell
32,59 €
Each
Aantal stuks
60 mA - - Closed Loop ±15 V 60mA -70 → +70 A 25.7mm 0°C 40.5mm +70°C 18mm - -
RS-stocknr. 650-560
FabrikantnummerCSLA1CF
FabrikantHoneywell
30,44 €
Each
Aantal stuks
- 10.9mm - Open Loop 8 → 16 V dc - - - - - - - - -