Three Phase Current Transformer – Accurate & Reliable Power Monitoring Solution

The Three Phase Current Transformer (CT) manufactured by Jiangyin yucheng Electric Co., Ltd. is developed for precise three-phase current measurement and signal acquisition in modern low-voltage electrical systems. Different from three separate single-phase transformers, this integrated three-in-one structure adopts high-performance magnetic core materials and split core-piercing design, realizing safe, stable and efficient current monitoring for commercial buildings, industrial equipment and smart power distribution systems.

Electrical Performance and Technical Specifications

To meet diverse monitoring, metering and protection demands, our three-phase integrated CT is equipped with complete standardized parameters:

• Rated primary input current: 5A ~ 800A
• Rated secondary output: 0–1VA or 0–100mA signal output
• Measurement accuracy: Ratio difference ≤ ±0.1%, Phase difference ≤ ±10 angular minutes
• Effective measuring range: 10%In ~ 130%In
• Applicable working frequency: 50–400Hz
• Core material: High-permeability nickel steel or nanocrystalline alloy
• Shell material: Flame-retardant ABS plastic, fire resistance grade 94-V0
• Internal structure: Environment-friendly epoxy resin integral casting
• Output connection: Terminal wiring with 1.5m shielded stranded wire

All above technical indicators deliver excellent linear output, high signal sensitivity and outstanding anti-electromagnetic interference performance, ensuring stable and accurate current signal transmission to monitoring instruments and protection devices.

Key Application Scenarios

The three-phase integrated current transformer is widely applicable to the following fields:

• Electrical fire monitoring and residual leakage alarm systems
• Current & voltage signal sensing equipment
• Electromagnetic relays and microcomputer comprehensive protection devices
• Intelligent power management and power quality monitoring systems
• Small current grounding power grid and industrial automation control equipment

It is the preferred sensing component for engineering projects requiring high operation reliability, ultra-precise measurement and seamless matching with smart electrical control systems.

Structural and Installation Advantages

Integrated Core-Piercing Through Design

Integral closed through-core structure allows all three-phase copper cables to pass through the inner cavity at one time. The overall size is standardized to match NSX and NXM molded case circuit breaker wiring dimensions, convenient for direct installation inside complete power distribution cabinets without occupying extra layout space.

Durable Materials & Stable Measuring Performance

Flame-retardant epoxy resin encapsulation and high magnetic conductivity core materials guarantee long service life, consistent measurement precision and strong resistance to external electromagnetic interference.

Wide Compatible Measuring Range

Covers 5A to 800A primary current, one unified CT series can adapt to small branch circuits and main incoming power lines, simplifying model selection and inventory management.

Compact Body & Firm Mounting

ABS outer shell matched with PBT internal skeleton provides stable mechanical strength; reserved screw fixing holes enable reliable installation inside various electrical cabinets and switch boxes, saving cabinet internal layout space.

Explore Three Phase Current Transformer solutions for retrofit-friendly, high-precision current monitoring applications.

Contact us for detailed specifications, installation guidance, or customization support.