Sinofuse RS309-MF-S250A RS309-MF-S High-Speed Cylindrical Bolt Fuse, 700V IEC/750V UL, 250A aR, Size 6TA - Pack of 3

Overview: The Sinofuse RS309-MF-S250A is a cylindrical, bolt‑mounted high-speed semiconductor fuse (aR) for AC/DC systems up to 700 V (IEC) / 750 V (UL). Rated 250 A, it combines small size, low I²t and high interrupting capacity for reliable short‑circuit/backup protection in power electronics. This item is sold as a pack of 3 units.

Key Features:

• High breaking capacity: AC 100 kA; DC 50 kA (time constant ≤15 ms)
• aR utilization category for semiconductor short‑circuit protection
• Cylindrical bolt‑mount construction; size code 6TA
• M10 mounting hardware; recommended torque 21 ±1 N·m
• Tested to UL248 and IEC 60269; CE and RoHS compliant

Technical Specifications:

• Rated voltage: 700 V (IEC) / 750 V (UL)
• Rated current: 250 A
• Breaking capacity: AC 100 kA; DC 50 kA (L/R ≤15 ms)
• I²t (A²s): pre‑arcing 12,300; clearing 40,300
• Power loss at In: 47.5 W
• Mounting: Bolt connection, M10 (21 ±1 N·m)
• Series/body: RS309‑MF‑S cylindrical, size 6TA

Applications:

• Inverters, rectifiers and power converters
• DC common bus and DC drives
• EV traction/charging, energy storage systems
• General industrial power electronics requiring fast fault clearing