Shu Guang
Shu Guang
Precision-engineered high-breaking capacity fuse-links and power distribution hardware tested to IEC and BS standards.
In the rapidly evolving global electrical power sector, J-Type Fuse Links represent a cornerstone technology for low-voltage and medium-voltage feeder pillar protection, street lighting cutouts, and industrial distribution boards. Originating under rigorous British Standards (BS 88 / BS 1361) and harmonized across International Electrotechnical Commission (IEC 60269) specifications, J-Type fuses are designed with slotted wedge contacts to deliver ultra-reliable, high breaking-capacity protection against catastrophic short-circuit overcurrents.
As global energy grids undergo massive modernization—integrating renewable energy inputs, high-density EV charging infrastructure, and smart urban power grids—the requirement for China Best J Type Fuse Suppliers & Factories has shifted from simple commodity sourcing to strategic OEM/ODM engineering partnerships. Modern distribution networks demand absolute thermal stability, minimal watt loss, and zero-fail arc extinction under severe fault conditions up to 80kA at 415V AC.
30+ Years of Manufacturing Integrity from Yueqing, Zhejiang—China's Electrical Capital
Founded in 1992 (originally established as Yueqing Shuguang Fuse Factory), Wenzhou Shuguang Fuse Co., Ltd. has grown into an authoritative power technology enterprise integrating specialized research, thermal development, automated production, global sales, and engineering field support.
Designated directly by the former Ministry of Electric Power Industry, our enterprise specializes in high-voltage fuses, medium-voltage current-limiting fuse links, J-Type distribution fuses, capacitor protection fuses, voltage transformer fuses, zinc oxide surge arresters, drop-out cutout fuses, and polymeric insulators. Under our prestigious "Shu Rong" brand, we deliver safety-critical components to state utilities and multinational industrial clients.
Our dedicated production campus features automated assembly lines, high-purity quartz sand filling stations, precision element stamping presses, and rigorous micro-ohmic testing rigs. We ensure every single J-Type fuse manufactured under our roof satisfies strict physical and electrical tolerances.
An in-depth whitepaper analysis of J-Type fuse metallurgy, slotted wedge contacts, and silica sand quenching dynamics.
J-Type fuse links are characterized by their unique slotted brass contacts designed for direct wedge-fitting into distribution pillar fuse bases. Available primarily in 82mm and 92mm fixing centers, the slotted design facilitates high-torque bolted clamping, minimizing contact resistance and preventing thermal hotspots during high continuous current loads (up to 630A).
The internal fusible element utilizes 99.99% pure silver ribbon featuring computer-calibrated restriction notches (M-effect points). Upon sensing an overcurrent fault, the silver element vaporizes rapidly across the constricted zones. The resulting metallic arc is instantly quenched by high-purity, chemically treated silica quartz sand fill, absorbing intense thermal shock within milliseconds.
Constructed from high-grade electrical porcelain or reinforced flame-retardant composite ceramics, the outer barrel retains extreme mechanical integrity under high internal pressures exceeding 100 bar during short-circuit clearing. Thermal shock resistance ensures stability across extreme ambient temperatures (-40°C to +80°C).
| Parameter Dimension | J-Type Standard Range (82mm) | J-Type Heavy Industrial (92mm) | Testing Standard Reference |
|---|---|---|---|
| Rated Current (In) | 20A - 400A | 315A - 630A | IEC 60269-2 / BS 88-2 |
| Rated Voltage (Un) | 415V AC / 660V AC | 415V AC / 660V AC / 690V AC | DIN 43625 / BS1361 |
| Breaking Capacity (I1) | 80 kA at 415V AC | 80 kA at 415V AC (100kA tested) | IEC 60282-1 / GB 15166.2 |
| Fixing Distance | 82 mm (3.2 inches) | 92 mm (3.6 inches) | ANSI C37.42 / BS 88 |
| Contact Type | Slotted Copper/Brass Wedge | Heavy-Duty Slotted Wedge Contact | Standard Utility Base Mount |
| Arc Quenching Medium | High-Purity Silica Quartz Sand | Chemically Treated Quartz Sand | ISO 9001 Process Validated |
Fully accredited quality assurance system meeting international electrical benchmarks.
Quality and authoritative reliability are the non-negotiable core of Wenzhou Shuguang Fuse Co., Ltd. Our products have undergone rigorous type testing and validation at top-tier national test facilities, including:
Our complete product lineup complies with international and national standards: 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. Furthermore, our internal quality system is certified under ISO9001:2000.
Versatile protection designed for global electrical grid operators, OEM transformer builders, and industrial plants.
J-Type fuses serve as the primary overcurrent protection device inside urban underground feeder pillars. Installed directly into wedge-type fuse bases, they provide rapid isolation of cable faults, preventing cascading failures across suburban distribution grids.
Utilized in conjunction with medium-voltage back-up fuse links to protect distribution transformers. Their high interrupting capacity guarantees safe clearing under severe secondary short-circuit faults without damaging core transformer windings.
Designed to handle transient inrush currents without unwanted fuse degradation. Ideal for high-density power factor correction capacitor banks and commercial EV fast-charging hub protection networks.
Pioneering eco-friendly materials, digital thermal telemetry, and smart grid protection.
Optimization of silver-copper alloy element micro-geometries to reduce internal power dissipation (watt loss) by up to 18%, aiding utility operators in achieving net-zero grid efficiency goals.
Integration of micro wireless thermal sensors within the fuse end-caps to provide real-time temperature status and pre-fault predictive maintenance alerts to smart grid SCADA systems.
Advanced hydrophobic ceramic glaze coatings and composite barrel materials designed for faultless performance in hyper-saline coastal zones and high-altitude solar installations up to 4,000m above sea level.
Trusted by state power utilities and global procurement partners across Southeast Asia, Middle East, Africa, and Europe.
Our products are exported to state electrical power authorities across China. Building on this robust foundation, our high-voltage fuses, drop-out cutouts, and J-Type fuse links are exported to over 40 countries, with domestic sales ranking consistently among the top in the power industry.
Guided by the enterprise philosophy of "Development by science and technology, and survival by quality", we accept customized production orders tailored to specific utility dimensions, mounting slots, current-time characteristics, and local environmental standards.
Leveraging our strategic location in Yueqing, Zhejiang, we maintain a complete supply chain for high-purity copper, silver foil, specialized ceramics, and quartz sand, enabling rapid production lead times and bulk containerized ocean export capabilities.
Expert guidance on selecting, installing, and maintaining J-Type fuse links and high-voltage circuit protection equipment.
J-Type fuse links are specifically designed for distribution networks, underground feeder pillars, and pole-mounted cutouts governed primarily by British Standard BS 88-2 and IEC 60269. They feature unique open-slotted contacts (usually at 82mm or 92mm fixing centers) that allow direct bolted mounting onto wedge-type bases. This mechanical structure provides exceptional low-contact-resistance electrical connections under high vibration and thermal cycling conditions, unlike knife-blade NH fuses or cylindrical end-cap fuses.
The dimension between the centers of the slotted contact studs defines the physical mounting capability within feeder pillar bases. The 82mm center version is typically used for standard low-to-medium current distribution ratings (up to 400A), while the 92mm center design accommodates larger ceramic bodies required for higher continuous current capacities (up to 630A) and higher heat dissipation demands. Choosing the correct fixing distance is essential for mechanical compatibility with installed utility hardware.
Our products are subjected to rigorous full-parameter type tests at national high-power testing labs, including the Electric Power Research Institute and the Xi'an High-Voltage Electrical Apparatus Research Institute Laboratory. All performance indicators conform to ANSIC37.42, DIN43625, BS2692, and IEC60282 standards. Every production batch undergoes 100% micro-resistance verification, dimensional tolerance inspections, and sand compaction density checks under our ISO9001:2000 quality management system.
Yes. Backed by over 30 years of manufacturing experience since 1992, our in-house engineering team designs and manufactures customized high-voltage and low-voltage fuses according to user drawings, specialized time-current melting curves, unique physical mounting brackets, or extreme ambient climate conditions.
High-purity quartz silica sand serves as the arc-quenching medium. When an overcurrent melts the internal silver fuse ribbon, an electric arc is generated at high temperature. The surrounding tightly compacted quartz sand instantly melts around the arc zone, absorbing massive amounts of heat energy and fusing into an insulating glass-like fulgurite structure. This rapidly extinguishes the electrical arc and limits the peak fault energy (I²t) passing through the circuit.
Explore our extensive range of high-voltage current-limiting fuses, expulsion cutout fuse links, and polymeric insulators.
