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China Current Transformer (CT) - Reliable Electrical Equipment from Leading Suppliers and Factory

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A current transformer (CT) is a vital component in electrical systems, essential for managing, monitoring, and safeguarding power supply efficiency. In China, leading suppliers and factories provide high-quality CTs that can detect substantial volumes of alternating current (AC) with remarkable precision. These transformers are widely utilized in high-current power circuits across power production, transmission, distribution, and various industrial applications, often integrated with safety relays or sophisticated measurement devices. Trust in our products to enhance your electrical infrastructure and ensure reliable performance.

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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.

    CTs require enough insulation to handle a high voltage between windings, linearity to minimize measurement mistakes, and high precision for energy metering.

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    Important: When using a CT, never leave the secondary winding open circuit. An open circuit can produce extremely high voltages that can damage electrical equipment.

    Finally, 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) works on the principle of electromagnetic induction. It has a primary winding connected in series with a high-current circuit and a secondary winding linked to measuring or protection devices. The secondary winding produces a proportionally reduced current — typically 5A or 1A — that is safe and measurable.
    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 magnetic flux in the core becomes unbalanced, generating dangerously high voltages across the secondary terminals. This can cause insulation failure, equipment damage, or serious injury to personnel.
    Q What are the standard secondary current ratings for industrial CTs?
    For most industrial applications, current transformers are standardized to output either 5A or 1A on the secondary side. The 5A rating is the most commonly used in industrial power systems, while 1A is preferred for long-distance connections to metering panels to minimize cable losses.
    Q What are the key differences between the RCT-35, RCT-58, RCT-90, and RCT-110 models?
    The main differences lie in their rated current ranges and physical dimensions. The RCT-35 handles lower rated currents (100/5A, 120/5A), while the RCT-90 and RCT-110 support higher rated currents up to 1500/5A and 1600/5A. Dimensionally, the RCT-110 is the largest, with a 102mm width and 157mm depth, making it suitable for higher-capacity installations.
    Q What insulation requirements must a current transformer meet?
    A current transformer must have sufficient insulation to withstand the high voltage present between the primary and secondary windings. This insulation must be rated for the system voltage level and comply with relevant safety standards to protect both the equipment and operators from electrical hazards.
    Q Why is accuracy important in current transformers used for energy metering?
    High accuracy in current transformers is essential for energy metering because even small measurement errors can result in significant billing inaccuracies over time. Metering-class CTs are designed with tight accuracy tolerances and excellent linearity to ensure that the current readings faithfully represent actual consumption, supporting fair and reliable energy billing.