SINOFUSE RS309-MF 100A 750V Fuses (2 Pieces)

Overview: The RS309-MF-100A is a high‑speed square body semiconductor fuse for AC/DC up to 700 V (IEC) / 750 V (UL). Rated 100 A, it offers high interrupting capability for protection of drives, DC bus, battery charging and power converters. This item is sold as a pack of 2 units.

Key Features:

• Rated voltage: AC/DC 700 V (IEC); 750 V (UL)
• High interrupting capacity: AC 100 kA; DC 50 kA (time constant <15 ms)
• Square body with slotted blade tags; size code 4SB
• Mounting screw M8; recommended torque 12 ±1 N·m
• Typical I²t (A²s) at 100 A: pre‑arcing 690; clearing 3400
• Compliance: UL248, IEC60269; RoHS compliant

Technical Specifications:

• Rated current: 100 A
• Rated voltage: 700 V AC/DC (IEC); 750 V UL
• Breaking capacity: AC 100 kA; DC 50 kA (L/R <15 ms)
• Power loss at 100 A: 25 W
• Size code: 4SB; dimensions (mm): A=110, B=24, C=66, D=84, E=95.5, F=9, G=18, H=3.2
• Installation: blade ends with M8 bolted mounting

Applications:

• Protection of semiconductor devices in inverters, rectifiers and DC drives
• DC common bus and battery charging systems
• Renewable and industrial power electronics requiring fast fault clearing