High Speed Semiconductor Protection Square Type Fuse

The High Speed Semiconductor Protection Square Type Fuse is engineered to deliver ultra-fast short-circuit isolation for high-power power electronics. Featuring an extended current rating spectrum from 25A to 3000A, this fuse utilizes 99.99% pure silver elements embedded in a consolidated quartz sand matrix. 

Precision-Notched Silver Elements: Our elements are stamped from 99.99% pure silver under micron-level tolerance controls. This guarantees strict adherence to published time-current curves and maintains a low resistance profile, reducing power loss (under 450W for the 3000A model).
High-Density Arc-Quenching Matrix: The internal chamber is filled with mechanically vibrated, high-purity quartz sand. This ensures zero voids, maximizing arc-cooling efficiency and successfully extinguishing up to 200kA fault currents in less than 2 milliseconds.
C799 Advanced Ceramic Housing: The non-porous ceramic body exhibits a tensile strength of over 200 MPa and dielectric insulation performance exceeding 15kV/mm. It maintains complete structural integrity during high-energy short-circuit detonations.
Optimized I2t Let-Through: Engineered with low pre-arcing and clearing I2t values, successfully restricting both peak current and total thermal energy to levels well below the destruction threshold of standard industrial semiconductors. 

We operate advanced in-house molding and electrical testing laboratories to accommodate bespoke configurations for system integrators:

Custom Electrical Profiling: Tailored I2t curves for unique coordination needs, custom DC voltage ratings up to 1500VDC, and low-wattage-loss configurations.
Hardware Modifications: Customized bolt-hole patterns, unique copper terminal geometries, double-body integration, and integrated microswitches for remote blown-fuse signaling.
Bespoke Branding & Laser Etching: High-definition laser marking of custom part numbers, serial numbers, customer logos, and dynamic tracking QR codes directly onto the ceramic body. 

Established in 1988, Zhejiang Chifeng Electric Co., Ltd. is a premier manufacturer dedicated to pioneering fuse technology and delivering high-reliability circuit safety solutions globally.

Decades of Industry Expertise:
Backed by over 35 years of specialized fuse manufacturing experience, trusted by 1,200+ clients worldwide.
Robust Technical Barriers:
Armed with 48 authorized patents (including core invention patents) and 159 qualification certificates, supported by a 65% automation rate in production.
Global Compliance & Certifications:
Formally ISO9001 certified. All products fully comply with IEC 60269 and GB 13539 standards, and hold prestigious international safety marks including CCC, CE, CB, TÜV Rheinland, and UL.
End-to-End Capability:
Operating from a 16,000 m² state-of-the-art facility, we house an in-house R&D center, a dedicated testing lab, and high-precision breaking capacity test systems.
Direct-from-Manufacturer Advantage:
Factory-direct sales model minimizes intermediary markups, ensuring top-tier quality with optimal cost efficiency. 

Incoterms Supported: FOB, CIF, CFR, EXW, and DDP (including customs clearance, duties paid, and delivery directly to your warehouse facility).
Industrial Packaging Standard: Each fuse is secured within an individual anti-static, shock-absorbing slot, then packed into multi-layer corrugated export cartons reinforced with ISPM-15 standard wooden pallets for global maritime or air transit.
Factory Lead Times:  Prototype / Stock Evaluation Samples: 3-5 working days.
Mass Production Orders (100 to 1000 units): 14-21 working days.
High-Volume Blanket Orders (over 1000 units): 25-35 working days.
Quality Documentation: Every shipment is accompanied by an internal Batch Test Report, Material Certificate of Conformance (CoC), and dimensional inspection sheets.