Sinofuse RS309-MF-300A RS309-MF High-Speed Square Body Fuse, 750V UL/700V IEC, 300A aR, Size 7TA M10 - Pack of 2

Overview: The Sinofuse RS309-MF-300A is a high-speed square-body semiconductor protection fuse for AC/DC systems up to 700 V (IEC) / 750 V (UL). Rated 300 A, it delivers high interrupting capacity and fast fault clearing for inverters, rectifiers, DC drives, and DC common bus circuits. 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 7TA; M10 bolted mounting (recommended torque 21 ±1 N·m)
• I²t values for precise coordination: pre-arc 17,500 A²s; clearing 58,800 A²s
• Power dissipation at In: 58 W
• Compliance: UL248 and IEC 60269; RoHS compliant

Technical Specifications:

• Rated current: 300 A
• Voltage: 700 V AC/DC (IEC); 750 V (UL)
• Interrupt ratings: 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 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