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Siemens Sentron Series Window Current Transformer, 200A Input, 200:1, 1 A Output, 30mm Bore

Siemens Sentron Series Window Current Transformer, 200A Input, 200:5, 5 A Output

Siemens SENTRON Series Current Transformer, 250A Input, 250:5

Siemens Sentron Series Window Current Transformer, 500A Input, 500:1, 1 A Output


Current transformers or (CT’s), also known as Core Balance Current Transformers or Current Transducers, are instruments that are used to reduce or multiply the current from a high current into a lower current or vice versa. This is done so that the power can then be easily managed by Relays and measurement tools for electrical circuits and processes. Current Transformers consist of a core, a primary and a secondary winding.

RS offer an extensive range of highly accurate Core Balance Current Transformers 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 transformer”. Once the current has been reduced it can be safely monitored and measured using an [Ammeters](https://uk.rs-online.com/web/c/automation-control-gear/process-control/ammeters/)

### 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 turn’s 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 Transducer?

CTs are used in a wide range of industrial and commercial measurement applications. Some of the most common are:

- Generating Stations
- Electrical Substations
- Commercial Electric
- Power Distribution
- Electrical Panels

Browse the broad range of Current Transformers RS have to offer and order today for next day delivery.



Current Transformers

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Phoenix Contact PACT-FAST Series Current Transformer Current Transformer

RS PRO Current Transformer Current Transformer 500:1, 7mm Bore

Eaton Z-WFR2 Series Current Transformer Current Transformer

Schneider Electric PowerLogic Series Current Transformer Current Transformer 1250:5A

Bourns 0556 Series Current Transformer Current Transformer 8.33402777777778A

Socomec CTA-VA4 Series Current Transformer Current Transformer 0.004 → 0.02 A Output

Bourns 0556 Series Current Transformer Current Transformer 83.3340277777778A

Bourns 0556 Series Current Transformer Current Transformer 16.6673611111111A

Siemens Current Transformers

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