Shu Guang
Shu Guang
Explore our premium segment of commercial electrical safety and power distribution equipment engineered for international high-voltage projects.
Established in 1992 (predecessor being the *Yueqing Shuguang Fuse Factory*), Wenzhou Shuguang Fuse Co., Ltd. is located in Yueqing, Zhejiang Province, the electrical capital of China. We are an integrated power technology enterprise specializing in research, development, production, and international logistics of electrical protection systems.
Over three decades, we have evolved from a local assembly plant into a leading manufacturer of high-voltage expulsion fuse links (specifically Type K and Type T fuse links), high-voltage current-limiting fuses, capacitor protection devices, zinc oxide surge arresters, drop-out cutout fuses, and high-voltage composite insulators.
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Understanding the Engineering, Speed Ratios, and Structural Anatomy of Fast-Acting Distribution Fuses
Under the IEEE C37.42 standard, Type K fuse links are classified as "fast-acting". They feature a speed ratio (the ratio of minimum melting current at 0.1s to that at 300s) of 6 to 8. This provides rapid clearing of faults to prevent damage to downstream components.
Our Type K fuses incorporate silver or silver-plated copper eutectic element wires. Dual-element structures are utilized for low-rating models to guarantee precise time-current characteristics and prevent elements from aging due to transient currents.
Constructed with vulcanized fiber inner tubes and high-strength auxiliary tubes, our fuse links withstand high tension inside the cutout fuse holder, resisting mechanical fatigue caused by wind, vibration, and thermal cycle shifts.
These specifications are applicable to standard high-voltage overhead distribution lines (typically 11kV, 15kV, 24kV, and 33kV to 38kV systems).
| Ampere Rating (A) | Speed Class | Standard Length (mm) | Minimum Speed Ratio | Conductor Material | Applicable Standards |
|---|---|---|---|---|---|
| 1A to 200A | Type K (Fast) | 530mm / 600mm / 787mm | 6.0 - 8.0 | Pure Silver / Silver-Copper Alloy | ANSI C37.42, IEC 60282-2 |
| 1A to 200A | Type T (Slow) | 530mm / 600mm / 787mm | 10.0 - 13.0 | Silver Eutectic Alloy / Tin Link | ANSI C37.42, IEC 60282-2 |
| Up to 50A (Miniature) | Type K / Custom | 8*150mm (Miniature HV) | < 6.5 | Alloy Wire with Strain Element | Custom Enterprise / IEC Standard |
Ensuring absolute protection coordination for modern substations, renewable energy collectors, and municipal utility networks.
With the exponential expansion of solar photovoltaics and wind power generation, distribution networks face bi-directional power flows, high transient currents, and high-frequency harmonics. Type K expulsion fuses are crucial in safeguarding solar pad-mounted step-up transformers and lateral taps. Their fast clearing speed isolates faulted sections before upstream substation circuit breakers trip, avoiding localized grid outages.
Electric utilities across North America, Latin America, Southeast Asia, and Africa are actively replacing aging electrical porcelain infrastructure with polymeric and composite alternatives. Our integrated factory solutions provide custom-length fuse links and heavy-duty polymer dropout cutouts to meet modern durability standards under highly polluted and coastal atmospheric conditions.
Wenzhou Shuguang Fuses are designated by the Ministry of Electric Power Industry to manufacture high-voltage fuses, tested in top-tier national electrical laboratories.
Every fuse design we construct must pass rigorous type testing procedures. Our physical properties tests and electrical characteristics tests conform to the highest national and international standards, including ANSIC37.42, DIN43625, BS2692, IEC282-2-1995, IEC60644, IEC60470, IEC60282-1, IEC269-2, GB15166.1, GB15166.2, GB15166.5, GB13593, DL/T640-1997, and VDE0636 standards.
Our complete range of products has been type-tested and qualified by recognized laboratories:
Our manufacturing and administrative workflows are accredited under the ISO9001: 2000 Quality Management System, providing full traceablility from raw materials (copper, silver, vulcanized fiber, porcelain) to the final tested products.
Custom designs for drop-out fuse cutouts, capacitor banks, oil-immersed transformers, and primary distribution lines.
Installed inside high-voltage drop-out porcelain or polymeric fuse cutouts. The Type K fuse link guarantees lightning surge ride-through while providing immediate separation when short-circuits occur on lateral lines, preserving the trunk line integrity.
Positioned on the high-voltage primary side of distribution transformers to shield against internal faults, winding short-circuits, and secondary terminal overloads. Prevents catastrophic transformer tank explosions.
Engineered to handle persistent capacitor inrush currents. Type K fuses safely isolate individual faulty capacitor units in a bank, minimizing voltage transients in the remaining capacitor system.
We manufacture specialty current-limiting and Bay-O-Net fuse links designed to operate directly inside hot dielectric transformer fluids, offering full-range clearing capabilities.
Leading the development of sustainable, high-precision, smart-grid integrated protection components.
We are developing green, halogen-free, gas-evolving organic lining materials for fuse tubes, aiming to replace older synthetic resins. This helps minimize carbon tracking and reduces environmental impacts during arc-extinguishing processes.
By incorporating micro-alloy elements into the eutectic active zones, we aim to narrow the tolerance of our time-current characteristic (TCC) curves to less than +/- 5%, facilitating optimal system coordination for utility engineers.
Future releases will feature integrated wireless micro-sensors on dropout assemblies. These sensors will transmit fault location data directly to control rooms via cellular or LoraWAN IoT protocols, streamlining line maintenance.
Get technical answers from our electrical engineering division regarding the selection, application, and compliance of Type K and Type T fuse links.
Complete your procurement requirements with our specialized product categories for utility and industrial projects.
