SINOFUSE RS309-MF-275A RS309-MF High-Speed Square Body Fuse, 700V IEC/750V UL, 275A aR, Size 7TA M10 - Pack of 2

Overview: The SINOFUSE RS309-MF-275A is a high-speed square body semiconductor fuse for AC/DC applications up to 700 V (IEC) / 750 V (UL). Rated 275 A, it offers high interrupting capacity 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 optimized for semiconductor short‑circuit protection
• Size code 7TA; M10 bolted mounting, recommended torque 21 ±1 N·m
• I²t (A²s) at 275 A: pre‑arcing 14,500; clearing 50,900
• Power dissipation at In: 53 W
• Complies with UL248 and IEC 60269; RoHS compliant

Technical Specifications:

• Rated current: 275 A
• Voltage: AC/DC 700 V (IEC); 750 V (UL)
• Interrupting rating: AC 100 kA; DC 50 kA (L/R <15 ms)
• Body/dimensions (7TA, mm): A=129, B=49, C=72, D=89.5, E=109, F=10.5, G=38, H=6
• Termination: Slotted blade tags; M10 hardware (21 ±1 N·m)

Applications:

• Semiconductor device protection 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