Shu Guang
Shu Guang
Medium and High-Voltage Overcurrent Protection Designed for Global Utility, Renewable Energy, and Industrial Grid Infrastructures
Explore our range of premium electric power fuse cutouts, insulators, surge arresters, and current-limiting backup fuse elements.
As the global power sector transitions toward high-penetration renewable energy integration, electric vehicle charging hubs, and decentralized distribution networks, the demand for highly reliable overcurrent safety equipment has peaked. Traditional, off-the-shelf power fuses often fall short when confronting complex fault scenarios, high short-circuit levels, and localized ambient stresses.
Our commitment as a leading ODM power fuse supplier is to bridge the gap between standardized electrical criteria and application-specific parameters. System designers and procurement directors look for more than a generic catalog item. They require custom current-time characteristics (I-t curves), modified physical dimensions, unique terminal adapters, and thermal performance specifically designed for underground containment, subsea substations, or high-altitude installations.
By using modern simulation tools and raw material selections, we provide tailored solutions that optimize safety, control arcs, and minimize downstream damage during fault conditions.
Driving next-generation high-voltage protection via material science and smart telemetry integration.
Our ODM fuses incorporate refined quartz sand of high silica content (99.8%+), dynamically consolidated via high-frequency vibration. This guarantees maximum thermal absorption during element vaporization, suppressing fault arcs in milliseconds.
By designing the pure silver element with variable cross-sections and incorporating 'M-effect' solder overlays, we achieve precise response thresholds. This design provides dependable low-overcurrent clearing and reliable high short-circuit interrupting capabilities.
Our fuse tubes utilize high-density, glazed ceramic or reinforced epoxy-fiberglass with excellent mechanical properties and tracking resistance. This prevents thermal shock cracks and stands up to salty, humid, or desert environments.
| Parameter / Customization Range | Standard Specification | ODM Tailored Capability |
|---|---|---|
| Rated Voltage (Ur) | 3.6 kV to 40.5 kV (DIN / IEC Standards) | Up to 72.5 kV for customized substation profiles |
| Rated Current (Ir) | 0.5 A to 315 A | Parallel multi-element configurations up to 630 A |
| Breaking Capacity (I1) | 31.5 kA to 50 kA | Up to 63 kA with high-density quartz packing |
| Striker System Force | Medium (50N) / High (120N) according to DIN 43625 | Custom force options for switch-disconnector integration |
Located in Yueqing, Zhejiang Province (the renowned electrical capital of China), Wenzhou Shuguang Fuse Co., Ltd. is a dedicated power technology enterprise that integrates research, development, production, and sales. The predecessor of our modern facility was the "Yueqing Shuguang Fuse Factory," established in 1992.
Over the course of three decades, we have continuously optimized our industrial manufacturing and design capabilities. Yueqing’s comprehensive electrical cluster gives us immediate, high-quality access to raw materials and processes like copper forging, precision silver stamping, and composite ceramic manufacturing. This localization keeps production lead times brief and ensures high quality control.
Our flagship "Shu Rong" brand has built a solid reputation in both domestic and international markets. Through rigorous supplier verification, automation, and end-to-end trace inspections, we supply high-performance, cost-effective safety products to utilities, plant operators, and panel builders worldwide.
We are designated by the Ministry of Electric Power Industry to manufacture reliable electrical distribution components.
Our product portfolio has passed inspection by 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.
The highest technical performance of our products meets the demanding criteria of ANSI C37.42, DIN 43625, BS 2692, IEC 282-2-1995, IEC 60644, IEC 60470, IEC 60282-1, IEC 269-2, GB 15166.1, GB 15166.2, GB 15166.5, GB 13593, DL/T 640-1997, and VDE 0636. Our quality assurance system is ISO 9001:2000 certified.
Tailoring electrical design elements to match unique grid profiles and regulatory demands.
Wind turbines and PV inverters often generate harmonic currents and experience transient temperature swings. Our customized low-loss HRC back-up fuses prevent nuisance tripping caused by cyclic overload conditions, maintaining continuous power generation.
Underground compact switchgear or pad-mounted transformers operate in hot, enclosed spaces. We supply oil-immersed medium-voltage fuses and dry-type hermetically sealed canister designs that manage heat effectively and operate safely underwater or inside gas-insulated switchgear.
Large medium-voltage motors exhibit high inrush currents upon startup. We optimize the time-current curves (I-t curves) of motor-protection fuses (IEC 60644 standards) to withstand cyclic startup stress while ensuring reliable protection against rotor locks or phase faults.
Supplying high-voltage hardware to energy, distribution, and manufacturing sectors internationally.
Our products are exported to various provincial power companies in China, creating a comprehensive sales network. We have also established strong business connections in Southeast Asia, the Middle East, Africa, Europe, and South America. We rank among the top domestic suppliers in export volume for medium-voltage current-limiting fuses.
We provide comprehensive engineering support during layout and procurement. This includes custom current-time calculations, mechanical design modification, high-power test reports, and assistance with utility certification processes. We invite international buyers, system integrators, and distributors to explore co-development opportunities that strengthen grid stability and performance.
Technical insight into specifying, importing, and customizing medium and high-voltage power fuses.
Select from our certified range of high-voltage limits, EV fuses, and transformer protection systems.
