Shu Guang
Shu Guang
A comprehensive overview of Medium & High Voltage protection solutions for modern energy infrastructures and utility grids.
In modern high-voltage transmission networks, energy storage installations, and transportation electrification systems, the demand for overcurrent safety devices has reached unparalleled performance levels. Power fuses certified under the European CE marking system confirm strict compliance with primary electromagnetic and low-voltage electrical safety guidelines. Fuses operating as current-limiting devices must act immediately under heavy short-circuit loads to contain energy and prevent destruction of downstream transformers, capacitor banks, and switches.
For engineering consultants and procurement leads globally, choosing certified manufacturers guarantees compatibility with standard DIN, BS, and ANSI setups, optimizing grid reliability while minimizing installation downtime.
The core objective of an HRC (High Rupturing Capacity) fuse is minimizing let-through energy. Under a major short-circuit condition, the thermal response of the metallurgical silver element must trigger phase transition and subsequent arc quenching within milliseconds. Achieving this speed prevents the peak prospective current from reaching its full structural value. This current-limiting behavior represents the baseline requirement for switchgear protection, ensuring long-term system integrity.
Wenzhou Shuguang Fuse Co., Ltd. is located in Yueqing, Zhejiang Province, the electrical capital of China. As a power technology enterprise, we integrate research, development, production, sales, and service. The predecessor of Wenzhou Shuguang Fuse Co., Ltd. was "Yueqing Shuguang Fuse Factory," established in 1992.
Over the course of three decades, our organization has transformed from a regional manufacturer into a global technology provider, creating specialized high-voltage circuit components for clients in Europe, Southeast Asia, the Middle East, and Africa. Operating under the renowned "Shu Rong" brand, our product range focuses on high-voltage current-limiting designs, capacitor protection components, drop-out cutout fuses, lightning arresters, and polymer/porcelain insulation accessories.
A rigorous verification process ensures our electrical designs operate safely under high thermal stresses and mechanical pressures.
Our safety procedures are designated by the Ministry of Electric Power Industry to manufacture high-voltage fuses of various voltage levels, high-voltage current-limiting fuses, high-voltage fuses for power capacitors, voltage transformer protection fuses, zinc oxide arresters, drop-out fuses, and high-voltage insulators.
Every product line undergoes performance evaluations. The products have passed the high-power test station of the Electric Power Research Institute of the Ministry of Electric Power, the National High-voltage Electrical Apparatus Quality Supervision and Inspection Center, the Xi'an High-voltage Electrical Apparatus Research Institute, and the High-Voltage Electrical Apparatus Laboratory. All performance tests are fully qualified.
| Geographic / Standard Org | Standard Reference Code | Application Details |
|---|---|---|
| International Electrotechnical Commission | IEC 60282-1 / IEC 282-2-1995 | High-Voltage Current-Limiting Fuses & Back-up Fuses |
| German National Standards (Deutsches Institut für Normung) | DIN 43625 | Medium Voltage Fuse-link dimensions and contact layouts |
| British Standards Institution | BS 2692 | Power fuse dimensions and electrical parameters |
| American National Standards Institute | ANSI C37.42 | HV distribution cutouts, links, and switch requirements |
| Specialized IEC Applications | IEC 60644 / IEC 60470 / IEC 269-2 | Fuses for motor circuits, motor contactors, and LV setups |
| Chinese National Standards | GB 15166.1 / .2 / .5, GB 13593, DL/T640-1997 | Domestic electrical standards and Ministry of Power specifications |
| German Association for Electrical Technologies | VDE 0636 | Overcurrent protection safety regulations |
Our quality system is verified under ISO 9001:2000, establishing batch traceability from raw silver elements and high-purity quartz sand down to the pressure-testing of the ceramic body assemblies.
Aligning manufacturing timelines, quality parameters, and shipping options for EPC contractors and industrial distributors.
Modern electrical utilities demand transparent engineering documentation. Every shipment includes comprehensive cold-resistance values, time-current melting characteristics curves, and breaking-capacity validation paperwork. This transparency simplifies the system coordination studies required by grid engineers.
Industrial developers run strict schedules. Our production pipelines are optimized to transition from raw-materials staging to finished product packaging within predictable windows. Automated winding systems ensure high consistency for batch deliveries, minimizing structural defects.
Whether adapting to customized high-voltage motor starters, outdoor drop-out fuse cutouts, or miniature utility sub-stations, clients often require tailored dimensional adjustments. We support custom strike-pin actuation force profiles (50N, 80N, 120N) and custom mounting brackets.
As the global grid moves toward decentralized, carbon-neutral operation, overcurrent protection equipment must adapt to complex electrical dynamics. Conventional electrical networks rely on static protection curves, but modern wind, solar, and electric mobility systems encounter rapid current fluctuations.
Utility-scale photovoltaic farms generate DC voltages up to 1500VDC, demanding specialized protection components. Our high-voltage current-limiting fuse elements are designed to counter cycling load conditions, preventing premature failure due to daytime temperature swings and high solar inputs.
The rapid expansion of direct-current fast charging (DCFC) hubs presents challenges. Our wholesale EV protection fuses deliver high-speed isolation in sub-millisecond intervals. This performance standard shields high-capacity EV batteries and semiconductor control panels from cascading thermal failure.
In recent years, the company has developed rapidly, and its economic and social benefits have improved significantly. We continue to deepen and improve our quality management system. While vigorously developing new products, we consistently prioritize the details of our manufacturing process.
High-quality raw materials and sophisticated testing equipment are the foundation of our quality assurance system. All performance indicators align with the corresponding technical conditions, and new products can be customized and produced at any time according to user needs. The "Shu Rong" brand continues to build a strong reputation among domestic and international utility operators.
We utilize silver elements with 99.99% purity. The precise placement of low-melting-point alloys (M-effect points) controls melting times under lower overcurrent faults, protecting overall component lifespan.
Our quartz sand filling uses high-silica grains that are washed, dried, and density-packed. Under thermal stress, the sand fuses into a glass-like structure (fulgurite), absorbing heat and extinguishing the arc.
We use high-strength, glazed alumina porcelain and fiberglass-reinforced epoxy tubes. This design resists weather, thermal cycles, and internal pressure peaks during fault clearance.
Supplying critical grid-protection equipment to national utilities and industrial centers worldwide.
The products are exported to various provincial power companies in China. A complete sales network has been formed throughout the country, and good business contacts have been established. New high-voltage fuses and high-voltage current-limiting fuse products are exported to Southeast Asia, the Middle East, Africa, Europe, and other countries and regions, and the domestic product sales rank among the top in the same industry.
The company adheres to the principle of "Development by science and technology, and survival by quality." We sincerely welcome customers from home and abroad to discuss cooperation and work together for the prosperity and development of the electric power industry and to create a brilliant future.
Our transport infrastructure ensures rapid dispatch from Ningbo and Shanghai ports. Backed by export certifications, customs documentation, and compliance certificates, our supply chain ensures seamless clearance and direct delivery to your warehouse or project site.
Providing direct answers to engineering inquiries regarding high-voltage current-limiting fuses and safety certifications.
