Sinofuse RS309-MF-350A High-Speed Bolt-Mounted Fuse, 350A, DC750V UL
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Sinofuse RS309-MF-350A is an RS309-MF cylindrical bolt-mounted high-speed fuse for circuit protection in power electronics, EV power systems, energy storage, drive systems, chargers, conductors, and related vehicle equipment. Verified ratings include 350A rated current, AC/DC700V under IEC, DC750V under UL, aR utilization category, and high breaking capacity for short-circuit, overload, and backup protection.
| Product ID / MPN | RS309-MF-350A |
| Brand | Sinofuse |
| Series / Category | RS309-MF high-speed cylindrical bolt-mounted fuse |
| Rated Current | 350A |
| Rated Voltage | AC/DC700V IEC; DC750V UL |
| Utilization Category | aR |
| Breaking Capacity | AC100kA; DC50kA, time constant ≤15ms |
| I²t Rating | Pre-arcing 23700 A²s; operating 86500 A²s |
| Rated Power Dissipation | 64W |
| Size Code | 7TA |
| Mechanical Specs | Dimensions: A 129mm, B 49mm, C 72mm, D 89.5mm, E 109mm, F 10.5mm, G 38mm, H 6mm; weight 447±15g |
| Mounting / Connection | M10 mounting bolt; recommended torque 21±1N.m |
| Environmental Ratings | Normal ambient operating condition -5°C to 40°C; permitted ambient operating condition -40°C to 85°C; pollution degree III |
| Standards / Certifications | Performance conforms to UL248 and IEC60269; CE and UL certified; RoHS compliant |
| Installation Notes | Recommended long-term current should not exceed 80% of rated current; fuse may be mounted vertically, horizontally, or inclined |
Typical applications include electric vehicle drive power systems, power conversion systems, energy storage and power systems, variable-frequency controllers, chargers, conductors, and vehicle equipment requiring short-circuit, overload, or backup protection.
Apexon Supply supports B2B sourcing and replacement review for Sinofuse RS309-MF-350A fuses, helping procurement teams compare verified electrical ratings, I²t values, mounting requirements, and dimensional data against equipment requirements.
Send the MPN, required quantity, and application details for RFQ support. Most qualified RFQs receive a response or quote within 12 hours.
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