Shu Guang
Shu Guang
Engineered for stability, precision, and long-term durability in power grids.
In the contemporary electrical engineering landscape, Potential Transformer (PT) Fuses represent the first line of defense for critical grid infrastructure. As global power demand surges, especially in the industrial and renewable energy sectors, the demand for high-reliability circuit protection has never been higher. Today, PT fuses are integral components in protecting sensitive voltage transformers from short-circuit currents and system overloads, ensuring the accuracy of measuring instruments and the safety of monitoring systems.
The industry is moving toward Smart Grid Integration and digitalization. Modern manufacturers are now focusing on enhancing the current-limiting capabilities of fuses while reducing their physical footprint. We see a significant trend in the adoption of environmentally friendly materials and the integration of smart sensors within fuse assemblies to provide real-time status updates to grid operators, reducing downtime and maintenance costs significantly.
International buyers, from utility companies to large-scale industrial contractors, are increasingly seeking ODM (Original Design Manufacturing) partners. The need for customized voltage levels, specific breaking capacities, and compliance with varying international standards (like IEC, DIN, and ANSI) makes the flexibility of a China-based factory highly attractive. Reliability, cost-efficiency, and rapid prototyping are the primary drivers for global procurement in the 2024-2025 market.
Located in Yueqing, Zhejiang Province—the renowned "Electrical Capital of China"—Wenzhou Shuguang Fuse Co., Ltd. stands as a beacon of power technology innovation. We are a comprehensive enterprise integrating research, development, production, sales, and service.
Our journey began in 1992 as the "Yueqing Shuguang Fuse Factory." Over the past three decades, we have evolved from a local workshop into a technology-driven powerhouse, serving as a designated manufacturer for the Ministry of Electric Power Industry.
Adhering to the most stringent international standards for maximum safety.
Our commitment to quality is validated by comprehensive testing and certifications. Our products have successfully passed rigorous evaluations at the High-Power Test Station of the Electric Power Research Institute, the National High-voltage Electrical Apparatus Quality Supervision and Inspection Center, and the Xi'an High-voltage Electrical Apparatus Research Institute.
IEC282, IEC60644, IEC60470, IEC60282-1
ANSI C37.42, DIN43625, BS2692, VDE0636
GB15166, GB13593, DL/T640-1997
ISO9001:2000 Quality System Certification
Years Experience
Countries Exported
Product Variations
Qualified Rate
Our products are trusted by provincial power companies across China and are exported globally to Southeast Asia, the Middle East, Africa, and Europe. We maintain a top-tier sales ranking within the industry due to our unwavering principle: "Development by science and technology, and survival by quality."
The China Factory Advantage: By operating in the heart of Yueqing, we leverage a complete industrial supply chain, allowing us to source high-quality raw materials efficiently. Our sophisticated testing equipment ensures that every "Shu Rong" brand product meets the performance indicators required for high-stakes electrical environments.
Versatile protection for diverse power distribution needs.
Our Potential Transformer Fuses are designed for a wide range of local and international application scenarios. Whether it's a high-voltage substation in a metropolitan area or a remote wind farm, our fuses provide the critical protection needed for:
Ensuring the safety of voltage transformers (PTs) in grid substations to prevent catastrophic system failures during fault conditions.
Providing reliable current-limiting solutions for large-scale factories and heavy industrial machinery requiring stable power input.
Integrated into solar and wind farm power collection systems where voltage stability is paramount for grid connection.
As a leading China ODM Potential Transformer Fuses Manufacturer, we understand that "one size fits all" no longer applies to the global power sector. Different regions have unique grid architectures—ranging from the high-density urban grids of Europe to the expansive, often harsh-environment grids of Africa and the Middle East. Our ODM capabilities allow us to adjust electrical characteristics, such as pre-arcing time-current curves and breaking capacities, to meet specific local utility requirements.
Our Potential Transformer Fuses are engineered using high-purity silver elements and refined quartz sand as the arc-extinguishing medium. This combination ensures that when a fault occurs, the arc is extinguished rapidly and safely within the ceramic body of the fuse. For global procurement officers, this technical precision translates to a lower total cost of ownership (TCO) and enhanced safety for their maintenance personnel.
Furthermore, the manufacturing process at Wenzhou Shuguang Fuse Co., Ltd. incorporates advanced automated winding and filling technologies. This ensures consistency across every unit produced—a critical factor for high-voltage protection where even a minor deviation can lead to equipment damage. Our factory is not just a production site; it is an engineering hub where we collaborate with clients to solve complex circuit protection challenges.
In the context of the global shift toward renewable energy, the intermittency of sources like solar and wind introduces new harmonics and transients into the system. Our R&D team is constantly updating our product line to handle these new stresses, ensuring that our fuses remain the most reliable choice for protecting the voltage transformers that monitor these green energy inputs. By choosing a factory with 30+ years of history, you are partnering with a team that has witnessed and adapted to every major shift in electrical technology over the last three decades.
Comprehensive protection solutions from low to high voltage.
