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China Current Transformer Suppliers | CTKT Series Factory for Reliable Power Management

A current transformer (CT) is an essential electrical device for managing, monitoring, and protecting power supply systems. These transformers can measure significant amounts of alternating current (AC) in small quantities, making them vital in various applications like power generation, transmission, and distribution. High-current power circuits are often integrated with safety relays or sensitive measurement instruments to ensure optimal performance and safety. As a leading manufacturer in China, our factory provides top-quality current transformers, ensuring reliable performance for industrial applications. Partner with trusted suppliers to enhance your electrical infrastructure with our advanced CT solutions
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    Product Details

    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.

    ⚠️

    Important: Never leave the secondary winding open circuit when using a CT. An open circuit can produce extraordinarily high voltages that could damage electrical equipment.

    CTs need sufficient insulation to sustain a high voltage between windings, linearity to minimize measurement mistakes, and high precision for energy metering. Current transformers are essential to the reliability, effectiveness, and safety of modern electrical systems because they enable more precise current monitoring and problem identification.

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

    TIO

    0–75A

    0–50mA / 0.333V

    1m

    10

    30

    34

    40.5

    14

    T16

    0–150A

    0–5A / 0.333V

    1m

    16

    38

    38.5

    51

    19

    T24

    0–250A

    0–5A / 0.333V

    1m

    24

    51.5

    49

    73

    22

    T36

    0–600A

    0–5A / 0.333V

    1m

    36

    70

    53

    89

    24.5

    T45

    0–800A

    0–5A / 0.333V

    1m

    45

    79

    59

    98

    22

    T50

    0–1000A

    0–5A / 0.333V

    1m

    50

    94

    70

    120

    29

    Accuracy Grade: 1.0

    Overload Current: ≥ 1.2% ln
    Frequently Asked Questions
    Q What is a Current Transformer (CT) and how does it work?
    A Current Transformer (CT) works 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 measuring or protective devices. The large primary current is proportionally reduced to a safe, measurable level at the secondary winding — typically 5A or 1A — allowing accurate monitoring without exposing instruments or personnel to dangerous voltages.
    Q Why should the secondary winding of a CT never be left open circuit?
    Leaving the secondary winding open circuit is extremely dangerous. Without a connected load, the primary current continues to magnetize the core, generating an extraordinarily high voltage across the open secondary terminals. This can damage insulation, destroy connected equipment, and pose a serious safety hazard to personnel.
    Q What accuracy grade do these current transformers support?
    These current transformers are rated at Accuracy Grade 1.0, which means the measurement error is within ±1% of the actual value. This level of accuracy is well-suited for energy metering, power monitoring, and industrial measurement applications where precision is critical.
    Q What current ranges and signal outputs are available in this CT series?
    The CT series covers a wide range of current ratings: from 0–75A (TIO model) up to 0–1000A (T50 model). Signal outputs include 0–50mA or 0–5A, with a corresponding voltage output of 0.333V, making them compatible with most standard energy meters and monitoring systems used in industrial environments.
    Q What is the overload current specification for these CTs?
    These current transformers support an overload current of ≥ 1.2% of the rated current (ln). This ensures the CT can withstand temporary overcurrent conditions without compromising measurement accuracy or damaging the device, providing reliable performance in demanding industrial environments.
    Q What are the key requirements for proper CT installation and performance?
    For optimal performance, a CT must have: (1) sufficient insulation to withstand high voltage between windings; (2) good linearity to minimize measurement errors across the full current range; (3) high precision for accurate energy metering; and (4) a properly connected secondary load at all times to prevent dangerous open-circuit voltages. All models in this series come with a standard 1m lead length for flexible installation.