SINOFUSE RS309-MD-EVS-350A-C Fuse, 350A 500VDC, High-Speed Bolted-Blade, EV/HEV Protection - Pack of 3

The SINOFUSE RS309-MD-EVS-350A-C is a specialized high-speed bolted-blade fuse engineered for the protection of high-voltage DC systems within Electric Vehicles (EV) and Hybrid Electric Vehicles (HEV). Developed by Xi'an Sinofuse Electric Co., Ltd., this fuse is designed to deliver reliable overcurrent protection for critical battery circuits and power conversion modules, ensuring the safe isolation of electrical faults.

Precision Engineering This fuse features a high-density ceramic body that provides excellent insulation and heat dissipation capabilities. The internal high-purity silver melting elements are optimized for ultra-fast response times. The "C" configuration provides a robust bolted-blade mounting interface, which ensures low contact resistance and maximum mechanical stability against the constant vibrations and thermal shocks common in automotive and industrial environments.

Advanced Circuit Protection With a 350A current rating and a 500VDC capacity, the RS309-MD-EVS series belongs to the aR utilization category. It is specifically designed to protect power semiconductors—such as MOSFETs and IGBTs—by limiting the let-through energy () during a fault. It offers a 50kA breaking capacity, effectively quenching high-energy DC arcs and preventing catastrophic damage to downstream electronics.

Primary Applications

• EV Battery Packs: Main circuit and branch protection for high-voltage energy storage systems.
• Power Distribution Units (PDU): Protection for high-current distribution circuits in electric drivetrains.
• DC/DC Converters & Inverters: Safeguarding power electronic interfaces and motor drives.
• Industrial Energy Storage: Protection for commercial-grade battery arrays and energy management systems.

Standards and Compliance

• Technical Standards: Compliant with IEC 60269-4 and GB 13539.4 for semiconductor protection.
• Automotive Standards: Adheres to ISO 8820 and GB/T 31465 requirements.
• Environmental & Safety: RoHS compliant and CE certified for global markets.