Sinofuse RS309-MF-70A RS309-MF High-Speed Square Body Fuse, 700V IEC/750V UL, 70A aR, Size 4SB - Pack of 2

Overview: The Sinofuse RS309-MF-70A is a high‑speed square‑body semiconductor fuse for AC/DC systems up to 700 V (IEC) / 750 V (UL). Rated 70 A, it provides fast fault clearing and high interrupting capacity for inverters, rectifiers, DC drives, and DC bus protection. This item is sold as a pack of 2 units.

Key Features:

• High breaking capacity: AC 100 kA; DC 50 kA (time constant <15 ms)
• aR utilization category for semiconductor short‑circuit protection
• Square body size 4SB; slotted blade tags
• M8 bolted mounting; recommended torque 12 ±1 N·m
• UL248 / IEC 60269 compliant; RoHS compliant

Technical Specifications:

• Rated current: 70 A
• Rated voltage: 700 V AC/DC (IEC); 750 V (UL)
• I²t (A²s): pre‑arcing 340; clearing 1,760
• Power dissipation at In: 18 W
• Dimensions (size 4SB, mm): A=110, B=24, C=66, D=84, E=95.5, F=9, G=18, H=3.2
• Termination: blade ends; mounting with M8 screws (12 ±1 N·m)

Applications:

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