Huajidian is a leading provider of high-quality medium- and high-voltage power distribution equipment, based in Wenzhou, China. Our main products cover a full range of High and Medium Voltage Switchgear ranging from 6 kV to 330 kV. Integrating advanced insulation technology and intelligent monitoring systems, and relying on a rigorous quality control system, we provide safe, stable, and cost-effective power control and protection solutions for power companies, industrial parks, and large-scale infrastructure projects worldwide. As a professional manufacturer, we can customize products for different application scenarios. All our equipment complies with international standards, and our partner factories have passed ISO 9001 and ISO 14001 certifications and meet the type testing requirements of the International Electrotechnical Commission (IEC), making us a trustworthy industry supplier.
High and Medium Voltage Switchgear is the core hub of a power distribution system, playing a crucial role in circuit control, equipment protection, and line isolation, ensuring a continuous and safe power supply. Huajidian's main products include medium-voltage metal-clad switchgear, sulfur hexafluoride gas-insulated ring main units, and low-voltage distribution cabinets, covering voltage levels from 6 kV to 330 kV. Our products are robust in structure, easy to operate and maintain, and adaptable to various harsh operating conditions and complex power grid operation requirements.
The entire unit adopts a fully enclosed metal-armored structure, with a vacuum circuit breaker as the core component. The equipment has a small footprint, excellent arc resistance, and outstanding short-circuit protection capabilities, while also supporting remote monitoring and intelligent control. Widely used in rural power grid upgrades, industrial park power distribution, and commercial building power supply scenarios.
Uses sulfur hexafluoride gas as the insulation and arc-quenching medium, with all live parts sealed within a pressure-bearing cavity. The product is compact, saving over 40% of installation space, and features dustproof and moisture-proof properties, achieving over ten years of maintenance-free operation under normal conditions. Primarily used in urban substations, residential communities, and wind and solar power generation projects.
Mainly used for low-voltage power distribution and line control, equipped with core components such as air circuit breakers and protective relays. Adopting a modular design, it facilitates future expansion, offers high overall cost-effectiveness, and is suitable for production workshops, data centers, office buildings, and other locations.
Products strictly adhere to international standards such as IEC 60076 and IEC 62271, possessing CE and explosion-proof certifications. We can assist customers with market access certifications in various countries, including Saudi Arabia's SABER and Indonesia's SNI.
Implementing three major quality control processes—incoming material inspection, in-process inspection, and outgoing acceptance testing—ensuring comprehensive product quality control throughout the entire process.
Optional real-time monitoring modules for temperature, partial discharge, and mechanical status are available. Compatible with common smart grid communication protocols, it adapts to smart grid construction.
All products enjoy warranty service, core components are kept in stock, and we provide rapid and accurate after-sales response to customers worldwide.
A large industrial park in Vietnam houses over twenty production plants and urgently needed a stable and reliable 10kV power distribution system. Huajidian, as the cooperating supplier, provided 35 KYN28A-12 medium-voltage switchgear units and 12 sulfur hexafluoride ring main units for this project.
A: Our switchgear ranges from 6 kV to 330 kV, covering low, medium, and high voltage. We can customize rated voltage, rated current, breaking parameters, and intelligent configurations according to project needs. Our professional technical team provides one-stop technical support from solution design to implementation.
A: We employ multiple protection designs: the sulfur hexafluoride insulation is completely sealed to isolate moisture and dust; the cabinet surface is hot-dip galvanized or coated with a special anti-corrosion coating; core components such as circuit breakers undergo over 10,000 mechanical life tests; and all equipment undergoes a full set of acceptance tests before leaving the factory, fully adaptable to various complex operating conditions.
A: We provide full-cycle after-sales support: all products enjoy standard warranty service; core components are kept in global inventory and can be shipped within 7 days; we provide 24/7 online technical support, and can also provide on-site installation guidance and personnel training to minimize the risk of equipment downtime and ensure long-term stable operation of the equipment.
Power System AC380V/50Hz; 3-phase 3-wire / 4-wire / 5-wire systems.
Certifications IEC 62271-200, IEC 694, GB3906, DIN VDE 0670
Power System 380V/400V/690V, 50/60Hz Three-Phase AC
Certifications IEC 62271-200, IEC 694, GB3906, DIN VDE 0670
Power System 380V, 400V, 660V
Certifications IEC 62271-200, IEC 694, GB3906, DIN VDE 0670
Power System AC 400V, 50Hz; 400–3150A
Certifications IEC 62271-200, IEC 694, GB3906, DIN VDE 0670
Power System 630A–3150A, 50Hz
Certifications IEC 62271-200, IEC 694, GB3906, DIN VDE 0670
Power System 27 ~ 40.5 kV, 3-phase AC 50 Hz / 60 Hz
Certifications IEC 62271-200, IEC 694, GB3906, DIN VDE 0670
