Sinofuse RS309-MF-80A RS309-MF High-Speed Square Body Fuse, 700V IEC/750V UL, 80A aR, Size 4SB - Pack of 2

Overview: The Sinofuse RS309-MF-80A is a high-speed square body semiconductor fuse for AC/DC systems up to 700 V (IEC) / 750 V (UL). Rated 80 A, it offers high interrupting capability and fast fault clearing for inverters, rectifiers, DC drives, and DC common bus protection. This item is sold as a pack of 2 units.

Key Features:

• Rated voltage: 700 V (IEC) / 750 V (UL)
• High breaking capacity: AC 100 kA; DC 50 kA (time constant <15 ms)
• aR utilization category for semiconductor short‑circuit protection
• Size code 4SB square body with slotted blade tags
• M8 bolted mounting; recommended torque 12 ±1 N·m
• Compliance: UL248, IEC 60269; RoHS compliant

Technical Specifications:

• Rated current: 80 A
• I²t (A²s): pre‑arcing 430; clearing 2080 (from RS309-MF table)
• Power dissipation at In: 20 W
• Body size/dimensions (4SB, mm): A=110, B=24, C=66, D=84, E=95.5, F=9, G=18, H=3.2
• Termination: blade ends, M8 hardware

Applications:

• Protection of power semiconductors in inverters and rectifiers
• DC drives and DC common bus
• Battery charging and power conversion equipment
• Industrial power electronics requiring rapid fault interruption