Sinofuse RS309-MF-250A RS309-MF High-Speed Square Body Fuse, 700V IEC/750V UL aR, AC 100kA/DC 50kA, Size 7TA M10 - Pack of 2

Overview: The Sinofuse RS309-MF-250A is a high-speed square body semiconductor fuse for AC/DC applications up to 700 V (IEC) / 750 V (UL). Rated 250 A, it provides fast fault clearing and high interrupting capacity for inverters, rectifiers, DC drives, and DC common 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 with slotted blade tags; size code 7TA
• Bolted mounting with M10 hardware; recommended torque 21 ±1 N·m
• UL248 and IEC 60269 compliant; RoHS compliant

Technical Specifications:

• Rated current: 250 A
• Rated voltage: 700 V AC/DC (IEC); 750 V (UL)
• Body size code: 7TA
• Mounting: M10 bolted; recommended tightening torque 21 ±1 N·m
• Outline dimensions (7TA, mm): A=129, B=49, C=72, D=89.5, E=109, F=10.5, G=38, H=6
• Construction: Square body, slotted blade tags; blade‑to‑blade installation
• Interrupt ratings: AC 100 kA; DC 50 kA (L/R <15 ms)

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, high‑capacity fault interruption