Current Transformer & Current Transducers | RS
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    Current Transformers

    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

    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.

    1638 Products showing for Current Transformers

    200:1
    21 x 10mm
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    65mm
    45mm
    40mm
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    400:1
    30 x 10mm
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    70mm
    50mm
    30mm
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    3 x 125A
    25 x 21mm
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    DIN Rail Mounted
    Current Transformer
    330 mV
    125A
    330 mV
    80mm
    105mm
    54mm
    -25°C
    40°C
    -
    -
    Busbar, Foot, DIN Rail
    400:5
    40 x 11mm
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    Base Mounted
    -
    -
    400A
    5 A
    78mm
    62mm
    40mm
    -5°C
    +55°C
    -
    -
    Surface Mount
    125:5
    21 x 10mm
    -
    Base Mounted
    -
    -
    125A
    5 A
    65mm
    45mm
    40mm
    -5°C
    +55°C
    -
    -
    Surface Mount
    250:5
    33 x 23mm
    -
    Base Mounted
    -
    -
    250A
    5 A
    106mm
    93mm
    40mm
    +20°C
    +70°C
    -
    -
    Surface Mount
    3 x 800A
    50 x 54mm
    -
    DIN Rail Mounted
    Current Transformer
    330 mV
    800A
    330 mV
    124mm
    215mm
    54mm
    -25°C
    40°C
    -
    -
    Busbar, Foot, DIN Rail
    300:5
    30 x 11mm
    -
    Base Mounted
    -
    -
    300A
    5 A
    78mm
    62mm
    40mm
    -5°C
    +55°C
    -
    -
    Surface Mount
    500:5
    30 x 10mm
    -
    Base Mounted
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    500A
    5 A
    70mm
    50mm
    31mm
    -5°C
    +55°C
    -
    -
    Surface Mount
    1000:1
    23.8mm
    -
    -
    -
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    200A
    -
    -
    20.6mm
    55.6mm
    -55°C
    +130°C
    -
    -
    PCB Mount
    1000:1
    5mm
    -
    -
    -
    -
    10A
    -
    -
    9.53mm
    20.4mm
    -40°C
    +85°C
    -
    -
    PCB Mount
    100:5
    40 x 11mm
    -
    Base Mounted
    -
    -
    100A
    5 A
    78mm
    62mm
    40mm
    -5°C
    +55°C
    -
    -
    Surface Mount
    300:5
    30 x 10mm
    -
    Base Mounted
    -
    -
    300A
    5 A
    70mm
    50mm
    31mm
    -5°C
    +55°C
    -
    -
    Surface Mount
    400:1
    40 x 11mm
    -
    -
    -
    -
    -
    -
    78mm
    62mm
    40mm
    -
    -
    -
    -
    -
    600:5
    40 x 11mm
    -
    Base Mounted
    -
    -
    600A
    5 A
    78mm
    62mm
    40mm
    -5°C
    +55°C
    -
    -
    Surface Mount
    -
    -
    CVH5R0VP01
    Split Core
    -
    -
    5A
    -
    51mm
    -
    26.5mm
    -20°C
    +65°C
    -
    -
    Panel Mount
    600:5
    30 x 10mm
    -
    Base Mounted
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    -
    600A
    5 A
    70mm
    50mm
    31mm
    -5°C
    +55°C
    -
    -
    Surface Mount
    1500:5
    80 x 12mm
    -
    Base Mounted
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    -
    1500A
    5 A
    126mm
    104mm
    45mm
    -5°C
    +55°C
    -
    -
    Surface Mount
    1250:5
    38 x 128mm
    -
    Base Mounted
    -
    -
    1250A
    5 A
    170mm
    99mm
    45mm
    -5°C
    +55°C
    -
    -
    Surface Mount
    300:1
    5mm
    -
    -
    -
    -
    15A
    -
    -
    9.53mm
    20.4mm
    -40°C
    +120°C
    -
    -
    PCB Mount
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