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    Current Transformers

    Current transformers (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. Current transformers, however, work in a slightly different way from voltage transformers. Plus, the amount of reduction in current is dependent upon the turn ratio. Whereas, connecting an ammeter to the CT's terminals will allow you to measure the current easily.

    Current Transformers (CT) consist of a core, a primary and a secondary winding. In some current transformers, the primary winding has a limited number of turns, making it possible for current to be measured without disconnecting it from the supply or load. Since it is arranged in this manner, the current transformer is sometimes called a "series transformer" .

    It is possible, however, that the secondary winding contains many coil turns which are wound atop a laminated core made out of magnetic material that is low-loss. With this core, the cross-sectional area is large, resulting in a low magnetic flux density when coupled with a wire of a smaller cross-section, no matter if it has to step down the current, whatever the load.

    The secondary winding supplies current either to a short circuit, such as an ammeter or a resistive load, up to the point when the secondary becomes saturated or breaks down due to excessive voltage.

    RS offers 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 "step-down transformers". Once the current has been reduced it can be safely monitored and measured using an Ammeters

    Types of current transformer (CT meter)

    #1 - Toroidal Current Transformer

    In the shape of a doughnut, these transformers are designed without having a primary winding as part of their construction. Rather, a toroidal transformer has a window or hole through which the current flowing in the network passes.

    #2 - Wound Current Transformer

    Transformers have primary windings that are connected physically line to line with the conductor bringing the measured current through the circuit.

    #3 - Bar-type Current Transformer

    This type of transformer uses the cable, or busbar, of the main circuit as its primary winding, effectively one turn of the transformer. In most cases, they are bolted directly to current-carrying devices and are fully insulated from high operating voltages.

    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:

    1. Generating Stations
    2. Electrical Substations
    3. Commercial Electric
    4. Power Distribution
    5. Electrical Panels

    Usually, ammeters and current transformers are used in conjunction, with the current transformer being designed to deliver a maximum secondary current equivalent to the ammeter deflection at full scale. It is common for current transformers to have inverse turn ratios between their primary and secondary windings. Therefore, CT calibrations are usually geared towards a specific type of ammeter.

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

    1719 產品顯示為 Current Transformers

    HK$3,489.60
    LEM
    5:1
    21.7mm
    AKR
    -
    -
    24 V dc, 150 V ac
    5A
    4 → 20 mA
    57.2mm
    89.7mm
    30mm
    -20°C
    +50°C
    -
    -
    Panel Mount
    HK$81.68
    Bourns
    41.6673611111111A
    -
    0556
    Current Transformer
    Current Transformer
    -
    0.1 → 40A
    -
    -
    -
    -
    -
    -
    -
    -
    -
    HK$56.40
    Bourns
    50:1
    -
    0556
    Current Transformer
    Current Transformer
    -
    0.1 → 40A
    -
    -
    -
    -
    -
    -
    -
    -
    -
    HK$52.05
    Bourns
    50:1
    -
    0556
    Current Transformer
    Current Transformer
    -
    0.1 → 40A
    -
    -
    -
    -
    -
    -
    -
    -
    -
    • RS庫存編號 399-7317
    • 製造零件編號 AS-103
    HK$24.70
    Nuvotem Talema
    15:1
    -
    AS-1
    -
    -
    -
    15A
    -
    -
    20.4mm
    9.53mm
    -40°C
    +120°C
    -
    -
    PCB Mount
    HK$56.40
    Bourns
    41.6673611111111A
    -
    0556
    Current Transformer
    Current Transformer
    -
    0.1 → 40A
    -
    -
    -
    -
    -
    -
    -
    -
    -
    HK$56.40
    Bourns
    16.6673611111111A
    -
    0556
    Current Transformer
    Current Transformer
    -
    0.1 → 40A
    -
    -
    -
    -
    -
    -
    -
    -
    -
    HK$56.40
    Bourns
    20.8340277777778A
    -
    0556
    Current Transformer
    Current Transformer
    -
    0.1 → 40A
    -
    -
    -
    -
    -
    -
    -
    -
    -
    HK$7,770.19
    Schneider Electric
    600/5A
    -
    PowerLogic
    Split Core
    Current Transformer
    720 V
    600A
    5 A
    -
    -
    -
    -
    -
    -
    -
    -
    • RS庫存編號 435-8640
    • 製造零件編號 HX 10-P
    HK$144.50
    LEM
    -
    1.1mm
    HX
    -
    Open Loop
    15 V
    10A
    -
    20mm
    19mm
    15.4mm
    -25°C
    +85°C
    -
    -
    PCB Mount
    HK$81.68
    Bourns
    83.3340277777778A
    -
    0556
    Current Transformer
    Current Transformer
    -
    0.1 → 40A
    -
    -
    -
    -
    -
    -
    -
    -
    -
    • RS庫存編號 294-9266
    • 製造零件編號 CTRA8120/5-2.5/1-1809
    HK$151.40
    HOBUT
    -
    -
    CTRA
    -
    -
    -
    -
    -
    -
    -
    70mm
    -30°C
    +85°C
    -
    -
    -
    • RS庫存編號 381-0793
    • 製造零件編號 CT196M800/5-5/1
    HK$191.10
    HOBUT
    800:5
    45mm
    CT196
    Base Mounted
    -
    -
    -
    -
    126mm
    90mm
    60mm
    -30°C
    +85°C
    -
    -
    Base Mounted
    HK$10,707.03
    Schneider Electric
    750/5A
    -
    PowerLogic
    Split Core
    Current Transformer
    720 V
    750A
    5 A
    -
    -
    -
    -
    -
    -
    -
    -
    • RS庫存編號 399-7250
    • 製造零件編號 ASM-050
    HK$63.10
    Nuvotem Talema
    50:1
    -
    ASM
    -
    -
    -
    50A
    -
    -
    32mm
    20.5mm
    -40°C
    +120°C
    -
    -
    PCB Mount
    HK$241.40
    LEM
    600:1
    20.4 x 10.4mm
    HAS
    -
    Open Loop
    15 V
    200A
    -
    30mm
    40mm
    30mm
    -10°C
    +80°C
    -
    -
    Panel Mount
    • RS庫存編號 435-8684
    • 製造零件編號 HX 03-P/SP2
    HK$166.10
    LEM
    -
    0.6mm
    HX
    -
    Open Loop
    12 → 15 V
    3A
    -
    20.5mm
    23.8mm
    23.7mm
    -25°C
    +85°C
    -
    -
    PCB Mount
    • RS庫存編號 435-8656
    • 製造零件編號 HX 15-P
    HK$131.10
    LEM
    -
    1.4mm
    HX
    -
    Open Loop
    15 V
    15A
    -
    20mm
    19mm
    15.4mm
    -25°C
    +85°C
    -
    -
    PCB Mount
    HK$3,338.00
    LEM
    200:1
    21.7mm
    AKR
    -
    -
    24 V dc, 150 V ac
    200A
    4 → 20 mA
    57.2mm
    89.7mm
    30mm
    -20°C
    +50°C
    -
    -
    Panel Mount
    HK$302.01
    LEM
    -
    -
    LAH
    Closed Loop Hall Effect
    Closed Loop
    12 → 15 V
    125A
    -
    -
    -
    -
    -
    -
    -
    -
    -
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