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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 175-6128
    • 製造零件編號 3UL2900
    HK$44.30
    Siemens
    -
    -
    SIRIUS
    -
    -
    -
    -
    -
    54mm
    9.2mm
    18.3mm
    -25°C
    +60°C
    -
    -
    Snap-On Mount
    HK$244.60
    Carlo Gavazzi
    100:5
    23.3mm
    CTD1X
    -
    Closed Loop
    -
    100A
    5 A
    83mm
    46mm
    -
    -
    -
    -
    -
    -
    • RS庫存編號 175-6133
    • 製造零件編號 4NC5115-0CC21
    HK$692.90
    Siemens
    75:1
    -
    Sentron
    Window
    -
    -
    75A
    1 A
    65.6mm
    60mm
    75.3mm
    -30°C
    +55°C
    -
    -
    Chassis Mount
    • RS庫存編號 175-6129
    • 製造零件編號 4NC5112-0CB21
    HK$654.40
    Siemens
    50:1
    -
    Sentron
    Window
    -
    -
    50A
    1 A
    65.6mm
    60mm
    75.3mm
    -30°C
    +55°C
    -
    -
    Chassis Mount
    • RS庫存編號 181-2771
    • 製造零件編號 ND5015/035/61
    HK$2,155.86
    Dold
    3:1
    -
    RN 5883
    -
    -
    -
    3A
    -
    67mm
    88mm
    10.5mm
    -40°C
    +60°C
    -
    -
    DIN Rail
    • RS庫存編號 175-6152
    • 製造零件編號 4NC5123-2CE21
    HK$627.60
    Siemens
    250:5
    -
    Sentron
    Window
    -
    -
    250A
    5 A
    65.6mm
    60mm
    75.3mm
    -30°C
    +55°C
    -
    -
    Chassis Mount
    HK$161.40
    LEM
    15:1
    0.7mm
    HY
    -
    Open Loop
    12 → 15 V
    5A
    -
    23mm
    36mm
    12mm
    -10°C
    +80°C
    -
    -
    PCB Mount
    HK$2,650.00
    Socomec
    -
    80mm
    TF-80
    Rogowski Coil
    -
    600 V
    150A
    600 A
    -
    -
    -
    -
    -
    -
    -
    -
    • RS庫存編號 175-6199
    • 製造零件編號 4NC5432-0CH21
    HK$1,237.90
    Siemens
    1000:1
    -
    Sentron
    Window
    -
    -
    1000A
    1 A
    84.1mm
    112mm
    127.5mm
    -30°C
    +55°C
    -
    -
    Chassis Mount
    • RS庫存編號 175-6212
    • 製造零件編號 4NC5436-2DK21
    HK$1,087.90
    Siemens
    1200:5
    -
    Sentron
    Window
    -
    -
    1200A
    5 A
    84.1mm
    112mm
    127.5mm
    -30°C
    +55°C
    -
    -
    Chassis Mount
    • RS庫存編號 175-6213
    • 製造零件編號 4NC5438-0CJ21
    HK$1,419.00
    Siemens
    2000:1
    -
    Sentron
    Window
    -
    -
    2000A
    1 A
    84.1mm
    112mm
    127.5mm
    -30°C
    +55°C
    -
    -
    Chassis Mount
    • RS庫存編號 221-0354
    • 製造零件編號 192T5040
    HK$436.42
    Socomec
    400:5
    44mm
    192T
    -
    -
    -
    400A
    -
    98.5mm
    86mm
    -
    -
    -
    -
    -
    -
    • RS庫存編號 200-3790
    • 製造零件編號 HOYS 100-S-0100
    HK$286.70
    LEM
    100:1
    -
    HOYS
    Base Mounted
    Open Loop
    +5 V
    100A
    -
    -
    -
    -
    -
    -
    -
    -
    Base Mounted
    • RS庫存編號 175-6223
    • 製造零件編號 4NC5925-5LT21
    HK$44.20
    Siemens
    -
    -
    Sentron
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    H-Rail Mount
    • RS庫存編號 200-3766
    • 製造零件編號 AI-PMUL
    HK$1,283.00
    LEM
    -
    -
    AI-PMUL
    DIN Rail Mounted
    -
    24 V dc
    -
    -
    -
    -
    -
    -
    -
    -
    -
    DIN Rail Mounted
    • RS庫存編號 215-4117
    • 製造零件編號 KM20-CTF-100A
    HK$1,609.90
    Omron
    3000
    -
    KM20-CTF
    Straight Through
    -
    -
    100A
    -
    96mm
    48mm
    -
    -
    -
    -
    -
    -
    • RS庫存編號 181-0002
    • 製造零件編號 MR-1-P5
    个 (以毎盒:150)
    HK$51.551
    KEMET
    -
    7.4mm
    MR
    -
    -
    -
    30A
    -
    -
    21.8mm
    8.5mm
    -20°C
    +80°C
    -
    -
    -
    • RS庫存編號 221-0331
    • 製造零件編號 192T3440
    HK$1,078.98
    Socomec
    -
    22mm
    192T
    -
    -
    -
    3 x 400A
    -
    150mm
    75mm
    -
    -
    -
    -
    -
    -
    • RS庫存編號 187-9962
    • 製造零件編號 192T0006
    HK$16.91
    Socomec
    -
    -
    TCA 14
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    HK$500.50
    Schneider Electric
    60:5
    21mm
    METSECT
    Tropicalise
    -
    -
    60A
    5 A
    65mm
    44mm
    37mm
    -25°C
    +60°C
    Yes
    Green Premium
    DIN Rail
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