Current Transformers, CT Meter, Split Core CTs, Core Balance CTs | RS
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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.

    1665 표시되는 제품 Current Transformers

    개당
    ₩445,616.40
    Phoenix Contact
    100:1
    32mm
    MCR-SL-CUC-100-I
    -
    -
    20 → 30 V dc
    100A
    4 → 20 mA
    70mm
    14.3mm
    30.2mm
    -40°C
    +65°C
    -
    -
    DIN Rail
    개당가격(351개가 1박스안에)
    ₩3,899.12
    RS PRO
    50:1
    5mm
    -
    -
    -
    -
    15A
    -
    -
    9.53mm
    20.4mm
    -40°C
    +120°C
    -
    -
    PCB Mount
    • RS 제품 번호 221-0281
    • 제조사 부품 번호 192T0523
    개당
    ₩99,495.24
    Socomec
    15:5
    -
    192T
    DIN Rail Mounted
    -
    -
    15A
    -
    85.5mm
    71mm
    -
    -
    -
    -
    -
    -
    개당
    ₩145,211.20
    LEM
    500:1
    25.5mm
    LF
    -
    Closed Loop
    12 → 15 V
    500A
    150 mArms
    57.4mm
    67.3mm
    15.7mm
    -25°C
    +70°C
    -
    -
    Panel Mount
    • RS 제품 번호 175-6142
    • 제조사 부품 번호 4NC5121-2CC21
    개당
    ₩110,525.20
    Siemens
    150:5
    -
    Sentron
    Window
    -
    -
    150A
    5 A
    65.6mm
    60mm
    75.3mm
    -30°C
    +55°C
    -
    -
    Chassis Mount
    개당
    ₩180,160.40
    LEM
    50:1
    18mm
    APR
    -
    Closed Loop
    24 V dc
    10 A, 25 A, 50A
    0 → 5 V, 0 → 10 V
    69mm
    67mm
    55mm
    -20°C
    +60°C
    -
    -
    DIN Rail
    • RS 제품 번호 279-2446
    • 제조사 부품 번호 855-305/250-501
    개당
    ₩50,872.80
    WAGO
    250:5
    -
    855
    Current Transformer
    Current Transformer
    -
    250A
    5 A
    -
    -
    -
    -
    -
    -
    -
    -
    • RS 제품 번호 175-6199
    • 제조사 부품 번호 4NC5432-0CH21
    개당
    ₩232,725.20
    Siemens
    1000:1
    -
    Sentron
    Window
    -
    -
    1000A
    1 A
    84.1mm
    112mm
    127.5mm
    -30°C
    +55°C
    -
    -
    Chassis Mount
    • RS 제품 번호 331-418
    • 제조사 부품 번호 CT143M60/5-1.5/1-001
    개당
    ₩27,692.40
    HOBUT
    60:5
    24mm
    CT143
    DIN Rail Mounted
    -
    -
    60A
    5 A
    70mm
    49mm
    45mm
    -30°C
    +85°C
    -
    -
    DIN Rail Mounted
    • RS 제품 번호 221-0342
    • 제조사 부품 번호 192T4640
    개당
    ₩388,883.64
    Socomec
    400:5
    -
    192T
    Split Core
    -
    -
    400A
    -
    158mm
    125mm
    -
    -
    -
    -
    -
    -
    • RS 제품 번호 715-7061
    • 제조사 부품 번호 56100C
    개당
    ₩2,387.60
    Murata Power Solutions
    10:1
    -
    5600
    -
    -
    -
    10A
    -
    -
    8.89mm
    20.19mm
    -40°C
    +85°C
    -
    -
    Through Hole
    개당
    ₩214,714.80
    LEM
    2700:1
    -
    LF
    -
    Closed Loop
    ±14.25 → ±25.2 V
    2700A
    ±0.54 A
    94.8mm
    110mm
    43.9mm
    -40°C
    +85°C
    -
    -
    Panel Mount
    • RS 제품 번호 279-2445
    • 제조사 부품 번호 855-305/200-501
    개당
    ₩50,872.80
    WAGO
    200:5
    -
    855
    Current Transformer
    Current Transformer
    -
    200A
    5 A
    -
    -
    -
    -
    -
    -
    -
    -
    개당
    ₩33,809.92
    RS PRO
    600:1
    40 x 11mm
    -
    -
    -
    -
    -
    -
    78mm
    62mm
    40mm
    -
    -
    -
    -
    -
    • RS 제품 번호 177-4931
    • 제조사 부품 번호 DVC 1000-P
    개당
    ₩159,442.80
    LEM
    -
    -
    DVC
    -
    Voltage
    4.75 → 5.25 V
    -
    -
    23.5mm
    43mm
    37mm
    -40°C
    +85°C
    -
    -
    PCB Mount
    • RS 제품 번호 237-3173
    • 제조사 부품 번호 1SVR450116R5300
    개당
    ₩68,394.40
    ABB
    150:5
    50mm
    CM
    Current Transformer
    Current Transformer
    -
    150A
    5 A
    78.5mm
    61mm
    48mm
    -
    -
    -
    -
    -
    • RS 제품 번호 731-5267
    • 제조사 부품 번호 HTA 200-S
    개당
    ₩123,685.20
    LEM
    200:1
    32mm
    HTA
    -
    Open Loop
    ±15 V
    200A
    -
    70mm
    17mm
    27.5mm
    -25°C
    +85°C
    -
    -
    Panel Mount
    • RS 제품 번호 522-014
    • 제조사 부품 번호 HAT 200-S
    개당
    ₩70,218.00
    LEM
    600:1
    40.5 x 30.5mm
    HAT
    -
    Open Loop
    15 V
    200A
    -
    65mm
    90mm
    10mm
    -10°C
    +80°C
    -
    -
    Busbar, Plug In
    개당
    ₩13,742.80
    Nuvotem Talema
    1000:1A
    9.5mm
    AQ
    Toroidal Ring
    Current Transformer
    300 V
    20A
    -
    23.8mm
    23.8mm
    -
    -
    -
    -
    -
    -
    • RS 제품 번호 833-2752
    • 제조사 부품 번호 DM2T0200
    개당
    ₩26,884.00
    Lovato
    200:5
    23mm
    DM
    Base Mounted
    -
    -
    -
    -
    65.5mm
    52mm
    46.5mm
    -25°C
    +50°C
    -
    -
    Base Mounted
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