Combined Current Transformer for HighAccuracy Leakage Monitoring and Electrical Safety

The Combined Current Transformer developed by Jiangyin yucheng Electric Co., Ltd. is specially designed for cableloop current monitoring in power distribution systems. With a compact circular design, it features simple structure, small size and flexible installation, providing reliable, highprecision current detection for electrical fire monitoring, leakage protection and smart power applications.

Electrical Performance and Technical Specifications

To meet diverse monitoring and protection requirements, the Combined  Current Transformer offers the following key parameters:

• Throughcore aperture: 45mm, 65mm, 80mm, 100mm
• Main circuit current range: 63A to 2000A
• Rated input: 0~1A (customizable 10mA~5A)
• Rated output: 0~1V (or 0~0.5mA)
• Accuracy class: 0.1, 0.2, 0.5, 1.0
• Operating frequency: 50Hz~400Hz
• Ratio error: ≤±0.1%
• Phase error: ≤±10 minutes
• Dielectric strength: 2.5kV/1mA/1min
• Insulation resistance: ≥1000MΩ (DC 500V)
• Unbalanced current output: ≤30mA, ≤10mA, ≤5mA, even ≤3mA (excellent balance performance)
• Core material: Highpermeability nickel steel or nanocrystalline alloy
• Housing material: Flameretardant ABS (UL94V0)
• Potting: Environmentfriendly epoxy resin fully enclosed casting
• Operating temperature: -12℃ ~ +45℃
• Ambient humidity: ≤85%
• Installation: Screwfixed throughcore structure
• Connection: Terminal type with 1.5m shielded wire

This series fully complies with GB 14287.22005 and GB 14287.22014 standards, ensuring stable performance under complex power environments.

Key Applications

The Combined Residual Current Transformer is widely used in:

• Electrical fire monitoring and prevention systems
• Fireproof and antileakage protection systems
• Intelligent power distribution and smart grid systems
• Small current grounding fault monitoring systems
• Electromechanical relay protection and microcomputer protection devices
• Environmental protection monitoring systems

It is especially suitable for cableloop scenarios requiring high antiinterference and low falsealarm rates.

Structural and Installation Advantages

Throughcore Integrated Structure

Adopts a circular throughcore design, with multiple aperture specifications (45mm to 100mm) to match different cable sizes. Installation is simple and fast without modifying the main circuit.

Excellent Balance and AntiInterference Performance

Highprecision magnetic core and optimized winding technology achieve ultralow unbalanced current output, greatly reducing false alarms caused by maincircuit current and magnetic field interference, ensuring high reliability.

High Stability and Safety

Flameretardant ABS housing and epoxy resin potting provide excellent insulation, moisture resistance and mechanical strength, adapting to longterm stable operation in various indoor distribution environments.

Flexible Configuration and Easy Integration

Supports multiple accuracy levels and standard output signals, compatible with various monitoring hosts, protection relays and smart devices, meeting the integration needs of different system architectures.

Installation & Maintenance

1. Pass the single-phase cable through the transformer’s central through-core hole according to the aperture specification.
2. Secure the transformer to the panel or cabin et using the mounting holes and screws.
3. Connect the output shielded wire to the corresponding monitoring or protection device, ensuring reliable grounding of the shield layer.
4. Check wiring and fastening status before poweron commissioning.

Daily maintenance is simple: regular inspection of terminal tightness, insulation condition and output signal status is sufficient, with no complex calibration required.

Choose Jiangyin yucheng Electric’s Combined Current Transformer for accurate, stable and reliable current monitoring. Contact us for detailed specifications, customized options and application guidance.