SINOFUSE RS309-MD-EVD-250A High-Speed Fuse, 250A 500VDC, Bolted-Blade EV/HEV Protection - Pack of 3

The SINOFUSE RS309-MD-EVD-250A is a high-speed, bolted-blade DC fuse specifically designed for the protection of Electric Vehicle (EV) and Hybrid Electric Vehicle (HEV) systems. Manufactured by Xi'an Sinofuse Electric Co., Ltd., this fuse is engineered to provide high-performance circuit interruption, safeguarding power semiconductors and battery systems against high-energy short circuits and overcurrent conditions.

Design and Durability The fuse features a specialized EVD bolted-blade design, which provides superior mechanical connection stability and electrical conductivity. This housing is constructed from high-strength ceramic, offering excellent thermal management and arc containment. Inside, high-purity silver melting elements ensure precise performance and long-term reliability under the high vibration and wide temperature fluctuations found in automotive environments.

Performance Characteristics With a 250A rating and a 500VDC operating voltage, the RS309-MD-EVD belongs to the aR utilization category. It is characterized by its ultra-fast triggering and low let-through energy, which minimizes the thermal stress on downstream power components such as inverters and DC/DC converters. Its high breaking capacity of 50kA ensures the safe quenching of DC arcs in high-power applications.

Typical Applications

• Battery Power Distribution: Protection of main and auxiliary circuits in EV battery packs.
• Power Conversion Systems: Safeguarding on-board chargers (OBC) and DC/DC conversion modules.
• Electric Drive Systems: Protection for motor controllers and high-voltage inverters.
• Energy Storage Systems (ESS): Circuit protection for commercial and industrial battery storage units.

Standards and Certification

• Automotive Integrity: Meets ISO 8820 and GB/T 31465 standards for automotive-grade fuses.
• Electrical Safety: Complies with IEC 60269-4 and GB 13539.4 for semiconductor protection.
• Environmental Quality: Fully RoHS compliant and CE certified.