Sinofuse RS309-MF-S70A RS309-MF-S High-Speed Fuse, 700V IEC/750V UL, 70A aR, Size 3SA - Pack of 3

Overview: The Sinofuse RS309-MF-S70A is a cylindrical, bolt‑mounted high‑speed semiconductor fuse (aR) for AC/DC systems up to 700 V (IEC) / 750 V (UL). Rated at 70 A, it combines small size, low I²t and high breaking capacity for reliable short‑circuit protection in power electronics. This item is sold as a pack of 3 units.

Key Features:

• Small volume, low melting I²t, high interrupting capability
• Ratings: AC/DC 700 V (IEC); 750 V (UL)
• High breaking capacity: AC 100 kA; DC 50 kA (time constant ≤15 ms)
• Compliance: UL248, IEC 60269; CE and UL certified; RoHS compliant
• Designed to withstand vibration/shock and wide temperature/chemical environments
• Bolt mounting with M8 hardware; recommended torque 12 ±1 N·m

Technical Specifications:

• Utilization category: aR (semiconductor short‑circuit protection)
• Rated current: 70 A
• Voltage ratings: AC/DC 700 V (IEC); 750 V (UL)
• Breaking capacity: AC 100 kA; DC 50 kA (L/R ≤15 ms)
• I²t (A²s): pre‑arcing 385; clearing 1,520
• Power loss at In: 18 W
• Size code: 3SA (cylindrical, bolt‑connected fuse body)
• Intended environment: meets ISO8820 and GB/T 31465 reliability requirements

Applications:

• EV and industrial power electronics: traction/power conversion systems
• DC common bus and battery/energy storage systems
• Inverters, rectifiers, chargers, VFDs and DC drives
• Short‑circuit and backup protection of conductors and auxiliary equipment