Sinofuse RS309-MD-450A RS309-MD Series High-Speed Fuse, 450A, 500V AC/DC
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Sinofuse RS309-MD-450A is a cylindrical bolt-connected high-speed fuse in the RS309-MD series, rated at 450 A and 500 V AC/DC with an aR utilization category. The 450 A variant uses size code 7ZB and has a pre-arcing I²t of 39500 A²s, total clearing I²t of 146000 A²s, and rated power dissipation of 75 W.
| Manufacturer | Sinofuse |
| Model | RS309-MD-450A |
| Series | RS309-MD |
| Fuse Type | Cylindrical bolt-connected high-speed fuse |
| Rated Current | 450 A |
| Rated Voltage | 500 V AC/DC |
| Utilization Category | aR |
| Breaking Capacity | 200 kA AC; 50 kA DC, time constant ≤15 ms |
| Pre-Arcing I²t | 39500 A²s |
| Total Clearing I²t | 146000 A²s |
| Rated Power Dissipation | 75 W |
| Size Code | 7ZB |
| Installation Bolt | M10 |
| Recommended Torque | 21 ± 1 N·m |
| Standards | UL 248, IEC 60269; safety and application-environment reliability according to ISO 8820 and GB/T 31465 |
| Compliance | CE, UL, RoHS |
The manufacturer lists the RS309-MD series for electric-vehicle drive power systems, power-conversion systems, energy-storage and power systems, variable-frequency controllers, chargers, wiring, and other vehicle components and equipment requiring short-circuit, overload, and backup protection.
Apexon Supply provides B2B sourcing and replacement support for Sinofuse RS309-MD-450A. Buyers should verify the rated current, voltage, aR category, breaking capacity, I²t characteristics, size code, and mounting requirements against the original equipment specification before replacement.
Send RS309-MD-450A, required quantity, and application requirements for RFQ support and technical alignment. Most qualified RFQs receive a response or quote within 12 hours.
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