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

    Sifam Tinsley
    250:5
    45mm
    Omega
    Base Mounted
    -
    -
    250A
    5 A
    -
    -
    -
    -
    -
    -
    -
    Busbar, DIN Rail, Plug In
    ABB
    -
    18mm
    CT PRO XT
    -
    -
    -
    -
    -
    -
    -
    -
    -5°C
    +50°C
    -
    -
    Busbar, DIN Rail
    HOBUT
    100:5, 200:5, 300:5, 400:5
    -
    CTSCEN
    Clip Fit
    -
    -
    -
    -
    113mm
    127mm
    40mm
    -30°C
    +80°C
    -
    -
    Clip Fit
    Broyce Control
    -
    70mm
    BZCT
    -
    -
    -
    -
    -
    117mm
    105mm
    40mm
    -20°C
    +60°C
    -
    -
    Surface Mount
    Carlo Gavazzi
    200:5
    24mm
    CTA
    Split Core
    -
    600 V ac
    -
    -
    85.5mm
    46mm
    -
    -
    -
    -
    -
    -
    LEM
    20:1
    16mm
    AT
    -
    -
    20 → 30 V dc
    20A
    4 → 20 mA
    67mm
    44.5mm
    114.5mm
    -20°C
    +60°C
    -
    -
    Cable Tie
    LEM
    10:1
    16mm
    AT
    -
    -
    -
    10A
    -
    67mm
    44.5mm
    78mm
    -20°C
    +60°C
    -
    -
    Cable Tie
    Siemens
    150:5
    13mm
    7KT12
    Straight Through
    -
    -
    150A
    5 A
    -
    -
    -
    -
    -
    -
    -
    Panel Mount
    LEM
    50:1
    16mm
    AT
    -
    -
    20 → 30 V dc
    50A
    4 → 20 mA
    67mm
    44.5mm
    36.5mm
    -20°C
    +60°C
    -
    -
    Cable Tie
    Sifam Tinsley
    400:5
    45mm
    Omega
    Base Mounted
    -
    -
    400A
    5 A
    -
    -
    -
    -
    -
    -
    -
    Busbar, DIN Rail, Plug In
    Phoenix Contact
    -
    28mm
    PACT MCR-V2
    Window
    Current Transformer
    -
    0 → 200A
    5 A
    -
    -
    -
    -
    -
    -
    -
    -
    Sifam Tinsley
    1500:5
    100mm
    Omega XMER
    Base Mounted
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    Surface Mount
    Socomec
    15:5
    -
    192T
    DIN Rail Mounted
    -
    -
    15A
    -
    75.1mm
    61mm
    -
    -
    -
    -
    -
    -
    LEM
    130:1
    13.5 x 10mm
    LA
    -
    Closed Loop
    12 → 15 V
    130A
    130 mA
    33mm
    37mm
    16mm
    -40°C
    +85°C
    -
    -
    PCB Mount
    HOBUT
    200:5
    21mm
    CT105
    Base Mounted
    -
    -
    -
    -
    79mm
    105mm
    53mm
    -30°C
    +80°C
    -
    -
    Base Mounted
    Siemens
    40:1
    -
    SIRIUS
    Toroidal Ring
    -
    -
    40A
    85 A
    64mm
    70mm
    75.5mm
    -25°C
    +60°C
    -
    -
    Chassis Mount, DIN Rail
    ABB
    -
    18mm
    CT PRO XT
    -
    -
    -
    -
    -
    -
    -
    -
    -5°C
    +50°C
    -
    -
    Busbar, DIN Rail
    LEM
    70:1
    -
    LA
    -
    Closed Loop
    12 → 15 V
    70A
    50 mArms
    27.6mm
    36.6mm
    14.45mm
    -40°C
    +85°C
    -
    -
    PCB Mount
    LEM
    10:1
    16mm
    AT
    -
    -
    20 → 30 V dc
    10A
    4 → 20 mA
    67mm
    44.5mm
    36.5mm
    -20°C
    +60°C
    -
    -
    Cable Tie
    Socomec
    -
    -
    TF-120
    Rogowski Coil
    Closed Loop
    600 V
    400 → 2000A
    -
    -
    -
    -
    -
    -
    -
    -
    -
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