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

The SINOFUSE RS309-MD-EVS-500A-C is a high-performance, high-speed bolted-blade fuse specifically engineered for the high-voltage DC protection requirements of Electric Vehicles (EV) and Hybrid Electric Vehicles (HEV). Designed by Xi'an Sinofuse Electric Co., Ltd., this component is a core safety element in modern automotive power systems, offering reliable circuit interruption during short-circuits and high-energy fault conditions.

Construction and Design The "C" variant designation indicates a specialized bolted-blade mounting style that ensures a stable, low-resistance mechanical and electrical connection, even under conditions of extreme shock and vibration. The fuse utilizes a high-grade ceramic body that provides exceptional thermal shock resistance and arc containment. Internally, high-purity silver melting elements are used to achieve precise and rapid response times (aR characteristic), ensuring critical power electronics are isolated before peak fault current causes damage.

Performance and Safety With a 500A continuous current rating and a 500VDC voltage rating, this fuse is optimized for high-power distribution. It features a high breaking capacity of 50kA, which is essential for safely quenching high-energy DC arcs. The low let-through characteristics significantly reduce the thermal stress on downstream semiconductors, such as IGBTs in motor controllers and DC/DC conversion modules.

Primary Applications

• Main Battery Protection: Circuit protection for high-voltage battery packs in electric trucks, buses, and logistics vehicles.
• Power Distribution Units (PDU): Main busbars and high-current branch circuit protection.
• EV Motor Controllers: Safeguarding the primary inverter and motor drive systems.
• Charging Infrastructure: Safety integration for high-power DC fast-charging stations.

Standards and Compliance

• Electrical Standard: Complies with IEC 60269-4 and GB 13539.4 for semiconductor protection.
• Automotive Standard: Meets the rigorous standards of ISO 8820 and GB/T 31465.
• Environmental Reliability: RoHS compliant and CE certified.