Shu Guang
Shu Guang
Precision-engineered electrical circuit safeguards specifically suited for Kiribati's coastal installations and local power distribution networks.
Kiribati, comprising 32 atolls and one raised coral island scattered across 3.5 million square kilometers of ocean, faces some of the most challenging conditions in the world for electrical distribution networks. The primary power infrastructure, operated by the Public Utilities Corporation (PUB) in South Tarawa, is transitioning rapidly toward renewable energy under the Kiribati Integrated Energy Roadmap (KIER). Integrating large-scale solar PV arrays and Battery Energy Storage Systems (BESS) introduces high fault current risks, which mandate the deployment of specialized low voltage (LV) protective equipment.
Our analysis of the Kiribati micro-grid structures indicates that atmospheric salinity (NaCl), consistent relative humidity exceeding 80%, and ambient temperatures averaging 30°C year-round require components with high corrosion resistance and high-thermal tolerance. Standard low voltage fuses will experience rapid terminal oxidation and premature thermal de-rating under these conditions, leading to persistent nuisance tripping and grid instability. Wenzhou Shuguang Fuse Co., Ltd. addresses these localized environmental conditions by providing custom-coated contacts and hermetically sealed housings designed to perform flawlessly in high-salt environments.
Custom-formulated silver-plated contacts resist marine atmospheric corrosion, preventing micro-arcs and thermal runaways at terminals.
Fuses calibrated and tested for ambient tropical conditions to ensure accurate time-current characteristics without premature aging.
Ideal for off-grid hybrid power systems in outer islands like Kiritimati (Christmas Island), protecting localized inverters and batteries.
Wenzhou Shuguang Fuse Co., Ltd. is located in Yueqing, Zhejiang Province, the recognized electrical capital of China. We are a power technology enterprise integrating research, development, production, sales, and service. The predecessor of Wenzhou Shuguang Fuse Co., Ltd. was the "Yueqing Shuguang Fuse Factory", established in 1992.
Over the past three decades, we have continuously modernized our facilities, integrating state-of-the-art testing laboratories and automated assembly systems. This commitment ensures that our products achieve the high standards required by demanding international utility operators, including the specialized utility networks of island nations in Oceania.
Our high-voltage and low-voltage fuses undergo rigorous performance validation to guarantee grid safety in compliance with international standards.
Wenzhou Shuguang Fuse Co., Ltd. is officially 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.
All safety and electrical performance characteristics conform to: ANSIC37.42, DIN43625, BS2692, IEC282-2-1995, IEC60644, IEC60470, IEC60282-1, IEC269-2, as well as Chinese national standards GB15166.1, GB15166.2, GB15166.5, GB13593, DL/T640-1997, and VDE0636. The factory's quality system is certified under ISO9001:2000.
Providing robust protection schemas for clean energy shifts, public utilities, and critical maritime communications.
Off-grid and grid-connected solar installations across South Tarawa require high-capacity current-limiting fuses to handle double-contingency backfeed currents in massive inverter groups.
Battery Energy Storage Systems require low-voltage fast-acting fuses that operate within milliseconds to clear DC faults, protecting valuable lithium-ion battery blocks from thermal runaway.
Providing customized distribution link boxes and HRC type J fuse systems specifically treated to endure extreme corrosion, ensuring continuous operation for critical port facilities.
In recent years, Wenzhou Shuguang Fuse Co., Ltd. has developed rapidly, improving its economic and social benefits. The company continues to deepen and enhance its quality management system, building on its history of sustainable growth. While vigorously developing new products, we pay close attention to the manufacturing process flow.
High-quality raw materials and sophisticated testing equipment back our quality assurance system. Every raw batch of copper and silver alloy must pass spectral analysis before production. We use high-purity quartz sand (exceeding 99.9% SiO2 content) as our arc-extinguishing agent. The quartz sand is scientifically vibration-packed to eliminate air voids, preventing secondary internal flashovers during fault interruptions. Our porcelain and polymeric insulation bodies are selected for high mechanical shear strength and low moisture absorption rates, which is critical for long-term survival in Kiribati's equatorial climate.
As smart grids become standard worldwide, Wenzhou Shuguang Fuse Co., Ltd. is actively designing the next generation of circuit protection components. Our engineering laboratory is focused on three primary areas of development:
| Fuse Category | Common Applications | Available Breaking Capacities | Applicable Kiribati Standard |
|---|---|---|---|
| NH (DIN) Fuses | Main distribution boards, motor protection, transformer secondaries | Up to 120 kA (500V/690V) | IEC 60269-2 / VDE 0636 |
| J-Type Fuses | Overhead line cut-outs, underground feeder pillars, wall cabinets | 80 kA (415V) | BS 1361 / BS 2692 |
| gPV (Solar Fuses) | Combiner boxes, inverters, battery management protection | 50 kA (1000V/1500V DC) | IEC 60269-6 |
| Expulsion Cutouts | Overhead rural networks, distribution transformers | Up to 12 kA (11kV / 24kV) | IEC 60282-2 / ANSI C37.42 |
Providing technical answers for utility operators, electrical designers, and procurement managers in the South Pacific.
Fuses are thermal devices that operate based on the melting heat generated by currents. In tropical regions like Tarawa, the ambient temperature inside enclosure boxes often reaches over 45°C. Without proper thermal de-rating calibration, standard fuses will melt under normal load currents. Wenzhou Shuguang Fuse provides accurate temperature-current derating charts to help electrical engineers size elements properly.
We use electroplated silver or nickel-plated contact blades rather than raw copper. This creates a barrier against sodium chloride aerosols, preventing oxidation and high contact resistance that causes localized overheating at terminal connections.
Yes, our low voltage HRC systems and high voltage expulsion links are certified to IEC and BS standards, which form the base framework for AS/NZS specifications. We supply the South Pacific market with compliant components for utility grids, mini-grids, and off-grid facilities.
Yes. With our in-house tool and mold facility established over three decades of manufacturing, we can fabricate custom blade shapes, mounting hole configurations, and specific overall link lengths to match legacy distribution units without requiring full box upgrades.
Our NH00 and higher standard HRC fuses achieve a certified breaking capacity of up to 120kA at 500V/690V AC. This ensures that even high-energy faults in major distribution circuits are isolated cleanly.
We partner with reliable ocean and air freight forwarders via hub ports in Fiji, Australia, and New Zealand, providing protective packaging to prevent moisture ingress during shipping transit across the Pacific.
Polymeric insulators offer superior hydrophobic (water-repelling) performance, preventing saline moisture from forming a continuous conductive path. This dramatically reduces leakage currents and insulator flashovers in environments near breaking ocean waves.
You can reach our engineering sales desk by clicking the "Send Inquiry Now" button and submitting your detailed technical specifications, required quantities, and delivery schedules.
High and Low Voltage protective assets built for commercial, industrial, and off-grid utility infrastructure.
