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. 123-9539
Fabrikantnummer7KT1200
FabrikantSiemens
146,70 €
Each
Aantal stuks
60:5 13mm Straight Through - - 60A 5 A - - - - - 105 x 71 x 90 mm -
Nieuw
RS-stocknr. 216-3341
Fabrikantnummer5SV8706-0KK
FabrikantSiemens
743,00 €
Each
Aantal stuks
- - - - - 630A 300 mA 33mm - 299mm - - - -
RS-stocknr. 175-6133
Fabrikantnummer4NC5115-0CC21
FabrikantSiemens
70,47 €
Each
Aantal stuks
75:1 - Window - - 75A 1 A 65.6mm -30°C 60mm +55°C 75.3mm 60 x 75.3 x 65.6 mm Sentron Power Monitoring Devices
RS-stocknr. 175-6151
Fabrikantnummer4NC5123-0DE21
FabrikantSiemens
74,88 €
Each
Aantal stuks
250:1 - Window - - 250A 1 A 65.6mm -30°C 60mm +55°C 75.3mm 60 x 75.3 x 65.6 mm Sentron Power Monitoring Devices
RS-stocknr. 175-6156
Fabrikantnummer4NC5125-2FE21
FabrikantSiemens
70,56 €
Each
Aantal stuks
300:5 - Window - - 300A 5 A 65.6mm -30°C 60mm +55°C 75.3mm 60 x 75.3 x 65.6 mm Sentron Power Monitoring Devices
RS-stocknr. 175-6212
Fabrikantnummer4NC5436-2DK21
FabrikantSiemens
110,70 €
Each
Aantal stuks
1200:5 - Window - - 1200A 5 A 84.1mm -30°C 112mm +55°C 127.5mm 112 x 127.5 x 84.1 mm Sentron Power Monitoring Devices
RS-stocknr. 175-6157
Fabrikantnummer4NC5126-2FE21
FabrikantSiemens
70,56 €
Each
Aantal stuks
500:5 - Window - - 500A 5 A 65.6mm -30°C 60mm +55°C 75.3mm 60 x 75.3 x 65.6 mm Sentron Power Monitoring Devices
RS-stocknr. 175-6134
Fabrikantnummer4NC5115-2CC21
FabrikantSiemens
63,90 €
Each
Aantal stuks
75:5 - Window - - 75A 5 A 65.6mm -30°C 60mm +55°C 75.3mm 60 x 75.3 x 65.6 mm Sentron Power Monitoring Devices
RS-stocknr. 175-6191
Fabrikantnummer4NC5330-0DE21
FabrikantSiemens
92,70 €
Each
Aantal stuks
750:1 - Window - - 750A 1 A 84.1mm -30°C 82.5mm +55°C 98mm 82.5 x 98 x 84.1 mm Sentron Power Monitoring Devices
RS-stocknr. 175-6224
Fabrikantnummer4NC5930-5LT21
FabrikantSiemens
5,10 €
Each
Aantal stuks
- - - - - - - - - - - - - 4NC53 Current Transformers
RS-stocknr. 175-6131
Fabrikantnummer4NC5113-0CB21
FabrikantSiemens
70,47 €
Each
Aantal stuks
60:1 - Window - - 60A 1 A 65.6mm -30°C 60mm +55°C 75.3mm 60 x 75.3 x 65.6 mm Sentron Power Monitoring Devices
RS-stocknr. 175-6213
Fabrikantnummer4NC5438-0CJ21
FabrikantSiemens
144,90 €
Each
Aantal stuks
2000:1 - Window - - 2000A 1 A 84.1mm -30°C 112mm +55°C 127.5mm 112 x 127.5 x 84.1 mm Sentron Power Monitoring Devices
RS-stocknr. 203-2084
Fabrikantnummer3RB2906-2BG1
FabrikantSiemens
156,00 €
Each
Aantal stuks
3:1 - Straight Through - - 3A 3 A 83mm - 45.3mm - - - -
RS-stocknr. 175-6127
Fabrikantnummer3UL2307-1A
FabrikantSiemens
445,50 €
Each
Aantal stuks
40:1 - Toroidal Ring - - 40A 630 A 62mm -25°C 300mm +60°C 286.2mm 300 x 286.2 x 62 mm Fault Current Monitoring
RS-stocknr. 175-6144
Fabrikantnummer4NC5121-2FA21
FabrikantSiemens
74,88 €
Each
Aantal stuks
150:5 - Window - - 150A 5 A 65.6mm -30°C 60mm +55°C 75.3mm 60 x 75.3 x 65.6 mm Sentron Power Monitoring Devices
RS-stocknr. 175-6152
Fabrikantnummer4NC5123-2CE21
FabrikantSiemens
63,90 €
Each
Aantal stuks
250:5 - Window - - 250A 5 A 65.6mm -30°C 60mm +55°C 75.3mm 60 x 75.3 x 65.6 mm Sentron Power Monitoring Devices
RS-stocknr. 175-6161
Fabrikantnummer4NC5222-2DE21
FabrikantSiemens
73,89 €
Each
Aantal stuks
200:5 - Window - - 200A 5 A 67.6mm -30°C 60.6mm +55°C 78.4mm 60.6 x 78.4 x 67.6 mm Sentron Power Monitoring Devices
RS-stocknr. 175-6132
Fabrikantnummer4NC5113-2CB21
FabrikantSiemens
63,90 €
Each
Aantal stuks
60:5 - Window - - 60A 5 A 65.6mm -30°C 60mm +55°C 75.3mm 60 x 75.3 x 65.6 mm Sentron Power Monitoring Devices
RS-stocknr. 175-6215
Fabrikantnummer4NC5438-2DL21
FabrikantSiemens
146,70 €
Each
Aantal stuks
2000:5 - Window - - 2000A 5 A 84.1mm -30°C 112mm +55°C 127.5mm 112 x 127.5 x 84.1 mm Sentron Power Monitoring Devices
RS-stocknr. 175-6141
Fabrikantnummer4NC5121-0DC21
FabrikantSiemens
74,88 €
Each
Aantal stuks
150:1 - Window - - 150A 1 A 65.6mm -30°C 60mm +55°C 75.3mm 60 x 75.3 x 65.6 mm Sentron Power Monitoring Devices