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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

    • RS庫存編號 871-1613
    • 製造零件編號 B82801B0205A100
    个 (以毎袋:3)
    HK$19.533
    EPCOS
    20:1
    -
    B828
    -
    -
    -
    20A
    -
    -
    7.11mm
    5.08mm
    -40°C
    +125°C
    -
    -
    Surface Mount
    • RS庫存編號 833-2881
    • 製造零件編號 2CCA880132R0001 CMS-200DR
    HK$1,091.85
    ABB
    160:1
    15mm
    CMS
    -
    -
    690 V ac, 1500 V dc
    160A
    -
    43.2mm
    50.1mm
    50.1mm
    -25°C
    +70°C
    -
    -
    DIN Rail
    • RS庫存編號 881-7935
    • 製造零件編號 2CSG225825R1101
    HK$412.40
    ABB
    -
    18mm
    CT PRO XT
    -
    -
    -
    -
    -
    -
    -
    -
    -5°C
    +50°C
    -
    -
    Busbar, DIN Rail
    • RS庫存編號 812-9601
    • 製造零件編號 CMCT200-1/1
    HK$1,268.66
    Carroll & Meynell
    200:1
    -
    CMCT
    -
    -
    -
    200A
    -
    -
    149mm
    -
    -
    -
    -
    -
    Surface Mount
    • RS庫存編號 772-1212
    • 製造零件編號 5SV8700-0KK
    HK$1,312.80
    Siemens
    -
    20mm
    5SV8
    Toroidal Ring
    -
    -
    -
    -
    34mm
    -
    -
    -10°C
    +50°C
    -
    -
    -
    • RS庫存編號 775-4943
    • 製造零件編號 AP-1000
    HK$36.76
    Nuvotem Talema
    10:1
    -
    AP-1
    -
    -
    -
    10A
    -
    -
    20.4mm
    9.53mm
    -40°C
    +85°C
    -
    -
    -
    • RS庫存編號 881-7926
    • 製造零件編號 2CSG225815R1101 CT PRO XT 250
    HK$251.33
    ABB
    -
    18mm
    CT PRO XT
    -
    -
    -
    -
    -
    -
    -
    -
    -5°C
    +50°C
    -
    -
    Busbar, DIN Rail
    • RS庫存編號 881-7948
    • 製造零件編號 2CSG225875R1101 CT PRO XT 80 SELV
    HK$248.98
    ABB
    -
    18mm
    CT PRO XT SELV
    -
    -
    -
    -
    -
    -
    -
    -
    -5°C
    +50°C
    -
    -
    Busbar, DIN Rail
    • RS庫存編號 833-2879
    • 製造零件編號 2CCA880124R0001 CMS-100S8
    HK$650.89
    ABB
    80:1
    10mm
    CMS
    -
    -
    690 V ac, 1500 V dc
    80A
    -
    31.8mm
    45.5mm
    45.5mm
    -25°C
    +70°C
    -
    -
    Cable Mount
    • RS庫存編號 833-2768
    • 製造零件編號 DM3T0500
    HK$282.36
    Lovato
    500:5
    30mm
    DM
    Base Mounted
    -
    -
    -
    -
    81.5mm
    71mm
    62.5mm
    -25°C
    +50°C
    -
    -
    Base Mounted
    • RS庫存編號 871-1616
    • 製造零件編號 B82801B0305A125
    个 (以毎袋:3)
    HK$21.827
    EPCOS
    20:1
    -
    B828
    -
    -
    -
    20A
    -
    -
    7.11mm
    5.08mm
    -40°C
    +125°C
    -
    -
    Surface Mount
    • RS庫存編號 871-1626
    • 製造零件編號 B82801B0803A020
    个 (以毎袋:3)
    HK$20.70
    EPCOS
    20:1
    -
    B828
    -
    -
    -
    20A
    -
    -
    7.11mm
    5.08mm
    -40°C
    +125°C
    -
    -
    Surface Mount
    • RS庫存編號 881-7941
    • 製造零件編號 2CSG225855R1101
    HK$301.60
    ABB
    -
    18mm
    CT PRO XT SELV
    -
    -
    -
    -
    -
    -
    -
    -
    -5°C
    +50°C
    -
    -
    Busbar, DIN Rail
    HK$328.15
    Sifam Tinsley
    600:1, 1000:1
    57mm
    CBCT
    Current Transformer
    Current Transformer
    -
    30 → 30000mA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    • RS庫存編號 283-445
    • 製造零件編號 CTL-12-S36-10L1
    HK$121.95
    U_RD
    1000:1A
    12mm
    CTL
    Current Transformer
    Current Transducer
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    HK$17,753.00
    Schneider Electric
    1500:5A
    -
    PowerLogic
    Current Transformer
    -
    720 V
    1.5kA
    -
    -
    -
    -
    -
    -
    -
    -
    -
    HK$260.41
    Phoenix Contact
    -
    20mm
    PACT MCR-V1
    Bus Bar
    Current Transformer
    -
    0 → 200A
    5 A
    -
    -
    -
    -
    -
    -
    -
    -
    HK$470.03
    Eaton
    25.0034722222222A
    -
    ES-PMCC-PDC-Eaton Distribution Parts
    -
    Current Transformer
    -
    -
    5 A
    -
    -
    -
    -
    -
    -
    -
    -
    HK$10,922.90
    Schneider Electric
    100:5A
    -
    LV43
    Current Transformer
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    HK$1,713.40
    Phoenix Contact
    -
    8.3mm
    PACT RCP
    Current Transformer
    Current Transformer
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
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