Sinofuse RSZ307-01-J4P High-Speed Fuse, 250A 750V DC, aR Fast-Acting Semiconductor Protection - Pack of 3

The Sinofuse RSZ307-01-J4P-250A is a professional-grade, high-speed DC fuse designed for the demanding requirements of power semiconductor protection. It is a critical component for Electric Vehicle (EV) traction systems, Battery Energy Storage Systems (BESS), and DC charging infrastructures. Engineered for high performance in a compact footprint, this fuse provides ultra-fast clearing of overcurrent and short-circuit faults to safeguard sensitive power electronics.

Key Features

• Specialized DC Circuit Protection: Specifically rated at 750V DC, making it highly suitable for high-voltage battery arrays and industrial DC power distributions.
• Ultra-Fast Response (aR Class): Designed with an "aR" utilization category, ensuring superior protection for semiconductors by minimizing let-through energy () during fault conditions.
• Automotive Grade Reliability: Compliant with GB/T 31465 and CE standards, featuring excellent resistance to mechanical vibration and shock, ideal for mobile or high-vibration environments.
• Efficient Thermal Management: Optimized internal design results in low power dissipation (48W at rated current) and a small temperature rise, increasing the longevity of surrounding components.
• Visual Fault Indication: Features a clear visual indicator on the body for rapid status identification and simplified maintenance.

Technical Specifications

• Manufacturer: Xi'an Sinofuse Electric Co., Ltd.
• Model Number: RSZ307-01-J4P-250A
• Rated Current: 250 A
• Rated Voltage: 750 V DC
• Utilization Category: aR (Partial range semiconductor protection)
• Breaking Capacity: ≥ 50kA (L/R = 5~10ms)