About NAIJI Electric
A trusted name in medium voltage switchgear manufacturing for over three decades, delivering reliable power distribution solutions to customers worldwide.
Our Story
Founded in 1991, Ningbo Nature ShinSung Automation Co., Ltd. (branded as NAIJI Electric) has been at the forefront of medium voltage switchgear manufacturing in China for over 35 years. Originally established as a Sino-Korean joint venture, the company brought together Chinese manufacturing expertise with Korean technology and quality standards.
Located in the Hangzhou Bay New District of Cixi, Zhejiang Province — one of China's most advanced industrial zones — our factory benefits from proximity to the Port of Ningbo, one of the world's busiest shipping ports, ensuring efficient logistics for international customers.
Today, NAIJI Electric operates independently as a fully Chinese-owned enterprise, retaining the international perspective and technical rigor from our joint venture heritage. We specialize in the design, manufacture, and testing of 12-24kV medium voltage switchgear including vacuum circuit breakers, SF6 load break switches, ring main units, gas-insulated switchgear, medium voltage switchgear panels, and low voltage switchgear.
Our Capabilities
Production Capacity
250+ units monthly capacity across all product lines. Flexible production scheduling to meet project deadlines.
Quality Testing
Comprehensive type testing including power frequency withstand, lightning impulse, mechanical endurance, and SF6 leak detection.
R&D Center
Dedicated engineering team developing new products and optimizing existing designs. Close collaboration with utility companies for field-proven solutions.
OEM Manufacturing
Custom branding and specification modifications for OEM partners. From nameplate customization to complete product redesign.
International Logistics
Located 40km from Ningbo Port. Experienced in FOB/CIF shipping, export documentation, and customs procedures for switchgear equipment.
Technical Support
Pre-sale and after-sale technical support including product selection, installation guidance, and on-site commissioning assistance.
Certifications & Standards
All NAIJI Electric products are manufactured under internationally recognized quality management systems and comply with relevant international standards.
From Order to Shipment in 30 Days
A single production flow covers fabrication, assembly, and routine testing — so lead times stay predictable for export orders.
Engineering Review
Specs confirmed against IEC 62271; drawings released to the workshop.
Fabrication
Enclosures and busbars cut, punched, and powder-coated in-house.
Assembly
Breakers, switches, and RMU tanks assembled on dedicated lines.
Routine Testing
Power-frequency withstand, resistance, and mechanical operation tests on every unit.
Packing & Shipment
Export packing with inspection report; standard 30-day lead time.
Workshops & Assembly Lines
Real photos from our production facility in Cixi, Zhejiang.
Quality Testing Equipment
Every switchgear unit passes routine tests per IEC 62271 before leaving the factory.
Certified for Global Markets
Our quality and environmental management systems are audited annually, and product lines carry the certifications international buyers require for tenders and customs clearance.
Request certificate copiesFactory Milestones
Founded as a Sino-Korean joint venture
Ningbo Nature ShinSung Automation Co., Ltd. established in Cixi, Zhejiang, focused on medium voltage switchgear.
INAEL RMU technology introduced
Licensed SF6 ring main unit technology from INAEL (Spain), adding fully sealed RMU lines to production.
Capacity expanded to 10,000 units/year
New assembly workshop and routine test stations brought annual outdoor switch capacity to 10,000 units.
Exports reach 20+ countries
CE and PCCC certifications opened European, Middle Eastern, and Southeast Asian markets.
120 employees, 30-day lead time
Full in-house fabrication, assembly, and IEC 62271 routine testing with a standard 30-day export lead time.
Partner with NAIJI Electric
Whether you're an EPC contractor, utility company, or distributor, we have the capacity and expertise to support your projects.