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Current Transformer (CT) Suppliers in China - High-Quality Factory Solutions for Power Monitoring and Protection

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A current transformer (CT) is a vital component in electrical systems, essential for controlling, monitoring, and safeguarding power supply. In China, leading suppliers and factories produce high-quality current transformers designed to detect large volumes of alternating current (AC) efficiently. These transformers are commonly utilized in high-current power circuits across power production, transmission, distribution, and industrial applications. With advanced safety relays and sensitive measurement devices, our current transformers ensure reliable operation and enhanced safety for your electrical networks.

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    Product Details

    Product Overview

    A CT employs electromagnetic induction and consists of two windings: a secondary winding with several turns linked to safety or measurement devices, and a primary winding with a few turns connected in series to a high-current circuit. In comparison to the primary winding, the secondary winding, which is usually tuned to 5A or 1A for most industrial applications, receives incredibly little current.

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    High insulation between windings to handle high voltage

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    Linearity to minimize measurement mistakes

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    High precision for energy metering applications

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    Secondary winding is usually tuned to 5A or 1A for most industrial applications, receiving incredibly little current compared to the primary winding.

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    Never leave the secondary winding open circuit. An open circuit can produce extremely high voltages that can damage electrical equipment.

    Current transformers are crucial to the reliability, efficiency, and safety of modern electrical systems because they enable more precise current monitoring and problem identification.

    Technical Parameters

    📋 Rated Current by Model

    Type Rated Current (A)
    RCT-35 100/5A, 120/5A
    RCT-58 1000/5A, 1200/5A
    RCT-90 800/5A, 1000/5A, 1200/5A, 1500/5A, 1600/5A
    RCT-110 1000/5A, 1200/5A, 1500/5A

    📐 Dimensional Parameters (mm)

    Type A B C D E F G
    RCT-35 93 78 25 78 2 55 9
    RCT-58 93 78 60 104 2 41 9
    RCT-90 93 78 90 136 2 41 9
    RCT-110 102 86 111 157 2 52 9

    Frequently Asked Questions

    Q What is a Current Transformer (CT) and how does it work?
    A Current Transformer (CT) uses electromagnetic induction to measure high currents. It consists of a primary winding connected in series with a high-current circuit and a secondary winding linked to measurement or safety devices. The secondary winding outputs a proportionally reduced current — typically 5A or 1A — that is safe and easy to measure.
    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 CT will attempt to drive all the magnetic flux through the core, producing dangerously high voltages that can damage electrical equipment and pose a serious safety risk to personnel.
    Q What rated current options are available for the RCT series?
    The RCT series covers a wide range of rated currents. For example, RCT-35 supports 100/5A and 120/5A; RCT-58 supports 1000/5A and 1200/5A; RCT-90 supports 800/5A up to 1600/5A; and RCT-110 supports 1000/5A, 1200/5A, and 1500/5A.
    Q What are the key performance requirements for a current transformer?
    A high-quality CT must meet three key requirements: sufficient insulation to handle high voltages between windings, excellent linearity to minimize measurement errors, and high precision to ensure accurate energy metering in industrial and utility applications.
    Q What is the standard secondary output current for industrial CT applications?
    For most industrial applications, the secondary winding of a current transformer is standardized to output either 5A or 1A. This standardization allows compatibility with a wide range of measurement instruments, protection relays, and energy meters.
    Q Why are current transformers important in modern electrical systems?
    Current transformers play a critical role in the reliability, efficiency, and safety of modern electrical systems. They enable precise current monitoring, accurate energy measurement, and effective fault identification — all of which are essential for the proper operation and protection of electrical infrastructure.