Shu Guang
Shu Guang
Standardized DIN, IEC, and XRNP current-limiting solutions engineered for primary substation loops, medium voltage switchgears, and power distribution systems.
Aligning circuit interruption technologies with the rigorous demands of Luxembourg's premier steel, research, and high-load transmission clusters.
In the southern industrial heartland around Esch-Belval and Schifflange, electric arc furnaces (EAF) and large rolling mills subject distribution networks to severe transient overcurrents, harmonics, and rapid cycling. Our HRC current-limiting fuses provide thermal endurance and precisely tailored time-current characteristics (TCC) to protect step-down transformers from secondary bus faults without nuisance tripping.
The academic and technological resurgence of Esch-sur-Alzette demands uncompromised power quality. Tier III and Tier IV server campuses operating near the University of Luxembourg require fast-acting medium-voltage backup links capable of isolating transformer defects in milliseconds, thereby dampening voltage sags and safeguarding sensitive digital infrastructure.
Luxembourg's National Integrated Energy and Climate Plan accelerates industrial PV integration, battery energy storage systems (BESS), and electrification of public transit. Our DIN-standard MV fuses mitigate bidirectional short-circuit currents common in decentralized grids, preventing equipment degradation in solar feeding substations across the Minett region.
Engineered with pure silver elements, chemically stabilized high-purity quartz sand, and precision striker pin mechanisms to deliver unmatched arc containment.
Under fault conditions, the fuse element vaporizes, initiating an electrical arc. The arc's heat fuses surrounding 99.8% purity, grain-calibrated quartz sand into non-conductive fulgurite. This process rapidly dissipates arc energy and creates high arc voltage that forces the short-circuit current to zero well before the natural sinusoidal peak.
The primary elements are precision-stamped from 99.99% pure silver foil. Engineered with metallurgical 'M-effect' solder overlays (Metcalfe effect), our fuses trigger uniform, eutectic melting during sustained low-overcurrent scenarios, preventing excessive thermal accumulation inside switchgear enclosures while preserving ultra-fast performance under severe short circuits.
Enclosures use high-frequency, non-porous electrical porcelain or heat-resistant epoxy-fiberglass tubes capable of withstanding extreme internal bursting pressures (up to 4 MPa). Standard DIN-dimensioned end caps are fitted with hermetically sealed 50N, 80N, or 120N spring or pyrotechnic strikers to trip downstream load-break disconnectors instantaneously.
Wenzhou Shuguang Fuse Co., Ltd. is located in Yueqing, Zhejiang Province, the electrical capital of China. It is a specialized power technology enterprise integrating research, development, production, sales, and service. The predecessor of Wenzhou Shuguang Fuse Co., Ltd. was "Yueqing Shuguang Fuse Factory" established in 1992.
For more than three decades, the company has adhered to the guiding operational principle of "Development by science and technology, and survival by quality." All performance indicators correspond precisely to international benchmarks, allowing custom engineering for medium and high-voltage transmission projects across Europe, Southeast Asia, the Middle East, and the Americas.
Our dedicated manufacturing base delivers high-voltage fuses of diverse voltage classes, current-limiting configurations, capacitor protection units, and expulsion devices to primary power authorities and global EPC contracting firms.
Designated by the Ministry of Electric Power Industry, our units have undergone full verification at the National High-voltage Electrical Apparatus Quality Supervision and Inspection Center and Xi'an High-voltage Electrical Apparatus Research Institute.
International Compliance Baseline: ANSI C37.42, DIN 43625, BS 2692, IEC 282-2-1995, IEC 60644 (Motor Circuit Applications), IEC 60470, IEC 60282-1, IEC 269-2, and Chinese National Standards GB15166.1, GB15166.2, GB15166.5, GB13593, DL/T640-1997, VDE 0636. Our complete quality assurance system holds ISO9001:2000 and subsequent international management accreditations.
ISO9001 Quality System
Xi'an Research Institute Type-Test
National Center Quality Certification
IEC 60282-1 Standard Report
Electric Power Institute Approval
The "Shu Rong" brand delivers robust reliability across demanding utility networks, power distribution boards, and renewable interconnections.
In recent years, the company has developed rapidly, improving its operational efficiency and precision engineering capabilities. We maintain strict control over every stage of manufacturing—from raw silver element chemical assay verification to automated sand filling and pressure compacting.
High-quality raw materials and sophisticated computerized test benches back our quality assurance protocols. Every performance parameter strictly conforms to corresponding national and international technical criteria. Custom fuse dimensions, specialized melting characteristics, and custom trip pins are designed and manufactured on demand to satisfy challenging retrofits and new EPC project requirements across Luxembourg and the greater EU.
Core step-down and distribution transformer protection up to 40.5kV.
Compact DIN cartridge integration within modern GIS/AIS architectures.
Specialized external and internal fuses preventing catastrophic rupture.
Drop-out expulsion assemblies engineered for harsh outdoor environments.
Bridging Chinese manufacturing efficiency with stringent European compliance, swift logistical channels, and predictable maintenance lifecycles.
Procuring directly from our Yueqing factory eliminates multi-tier intermediary markups. This delivers 25%–40% cost efficiencies for Esch-sur-Alzette utility asset managers and switchgear builders without compromising raw material specifications or type-tested safety certifications.
Through multimodal rail (China-Europe Railway Express) and direct air freight channels serving Luxembourg Findel Airport (LUX), critical spare-part replenishments and scheduled production batches arrive on site with full tracking, customs readiness, and CE documentation.
Every fuse link batch is stamped with individual serial batches, calibrated I²t cut-off data, and standard compliance marks. Type-test certificates from Xi'an High-Voltage Testing Station and ISO documentation accompany shipments to satisfy local Luxembourg grid auditors.
Extensive catalog spanning expulsion cut-outs, capacitor backup links, miniature VT protection, and low-voltage DIN accessories.
Clear, authoritative answers regarding standards harmonization, selection protocols, and global delivery directly from our engineering team.
Our DIN-standard MV current-limiting fuses strictly match the standardized contact distance (192mm, 292mm, and 442mm barrel lengths) and 45mm/88mm diameters required by European switchgear builders like Schneider Electric, Siemens, and ABB, ensuring plug-and-play installation inside Ring Main Units (RMU).
Back-Up fuses (IEC 60282-1 Class B) are engineered to interrupt fault currents from their rated minimum breaking current (I3) up to the maximum rated interrupting capacity (I1, typically 50kA). Overload currents below I3 are cleared in coordination with load-break switches or protection relays.
Our Yueqing factory enforces 100% resistance checks before and after filling quartz sand. The precise calibration of pure silver notch geometries ensures that peak arc energy (I²t let-through) remains tightly clamped, protecting transformer windings from high electromagnetic stresses.
Yes. Striker mechanisms can be supplied in standard 50N, medium 80N, or heavy-duty 120N variations with integrated thermal indicators to trigger auxiliary trip switches, isolate three-phase disconnectors, and prevent single-phasing on European motors.
Every commercial dispatch includes Certificate of Origin (COO), CE Declaration of Conformity, full factory routine testing reports (resistance, dimension, hermeticity), and relevant type-test certificates from the Xi'an High-Voltage Testing Institute and National Quality Centers.
Standard DIN 12kV, 24kV, and 36kV current-limiting fuses are dispatched from stock or produced within 7–12 business days. Custom non-standard dimensions, specific high-altitude de-rating links, or special capacitor links typically require 2–3 weeks factory tooling.