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China Current Transformers for High-Current Applications - Reliable Suppliers & Factory Direct Solutions

A current transformer (CT) is an essential electrical device used for the effective management, monitoring, and protection of power supply systems. It enables the measurement of significant amounts of alternating current (AC) with precision while using minimal physical space. As a critical component in power generation, transmission, distribution, and various industrial applications, high-current power circuits often integrate CTs with safety relays and sensitive measuring instruments. As a leading manufacturer in China, we strive to provide top-quality current transformers, ensuring that suppliers and industries alike can rely on our factory for all their power management needs
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    Product Details

    โ“˜ Product Overview

    A CT operates on electromagnetic induction and consists of two windings: a secondary winding with many turns linked to safety or measurement devices, and a main winding with a few turns connected in series to a high-current circuit. The primary winding receives a large amount of current, but the secondary winding, which is usually set to 5A or 1A for the bulk of industrial applications, receives very little. This proportionality, also known as the transformation ratio, enables accurate current monitoring while protecting workers and equipment from unsafe voltages.

    โšก
    High Insulation Requirement CTs require sufficient insulation to sustain high voltage between windings and ensure safe operation.
    ๐Ÿ“
    High Linearity & Precision Linearity minimizes measurement mistakes; high precision is essential for accurate energy metering.
    ๐Ÿ”’
    Reliable & Safe Design Current transformers enable precise current monitoring and fault identification in modern electrical systems.
    โš ๏ธ

    Important Safety Notice: Never leave the secondary winding open circuit when using a CT. An open circuit can produce extraordinarily high voltages that could damage electrical equipment and pose serious safety hazards.

    โš™ Technical Parameters
    Type Current Range Signal Output Lead Length (mm) Outline Size
    c A B C D

    TIO

    0โ€“75A

    0โ€“50mA / 0.333V

    1m

    10

    30

    34

    40.5

    14

    T16

    0โ€“150A

    0โ€“5A / 0.333V

    1m

    16

    38

    38.5

    51

    19

    T24

    0โ€“250A

    0โ€“5A / 0.333V

    1m

    24

    51.5

    49

    73

    22

    T36

    0โ€“600A

    0โ€“5A / 0.333V

    1m

    36

    70

    53

    89

    24.5

    T45

    0โ€“800A

    0โ€“5A / 0.333V

    1m

    45

    79

    59

    98

    22

    T50

    0โ€“1000A

    0โ€“5A / 0.333V

    1m

    50

    94

    70

    120

    29

    โ˜… Accuracy Grade: 1.0

    Overload Current: โ‰ฅ 1.2% ln
    ? Frequently Asked Questions
    Q1 What is a Current Transformer (CT) and how does it work?
    A Current Transformer (CT) operates on the principle of electromagnetic induction. It consists of a primary winding connected in series with a high-current circuit and a secondary winding linked to measurement or protection devices. The large primary current is proportionally reduced to a safe, measurable secondary current โ€” typically 5A or 1A โ€” based on the transformation ratio.
    Q2 Why should the secondary winding of a CT never be left open circuit?
    Leaving the secondary winding open circuit while the primary carries current can generate dangerously high voltages. These voltages can damage connected electrical equipment and pose a serious risk of electric shock or insulation failure. Always ensure the secondary is connected to a low-impedance load or short-circuited when not in use.
    Q3 What accuracy grade do these current transformers support?
    The current transformers listed in the technical parameters table support an accuracy grade of 1.0. This level of precision is suitable for energy metering and industrial measurement applications where reliable and accurate current monitoring is required.
    Q4 What current ranges are available across the CT model series?
    The CT series covers a wide range of current ratings to suit different applications: TIO (0โ€“75A), T16 (0โ€“150A), T24 (0โ€“250A), T36 (0โ€“600A), T45 (0โ€“800A), and T50 (0โ€“1000A). Each model is designed with corresponding physical dimensions to accommodate the appropriate conductor size.
    Q5 What signal outputs do these current transformers provide?
    The CT models output either 0โ€“50mA or 0โ€“5A current signals, as well as a 0.333V voltage signal, depending on the model. The TIO model outputs 0โ€“50mA / 0.333V, while the T16 through T50 models output 0โ€“5A / 0.333V. These outputs are compatible with standard energy meters, protection relays, and monitoring systems.
    Q6 What is the overload current specification for these CTs?
    The overload current specification for these current transformers is โ‰ฅ 1.2% of the rated current (ln). This means the CT is designed to handle momentary overload conditions without compromising accuracy or causing damage, ensuring reliable performance in demanding industrial environments.