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SINOFUSE RS309-MF-S500A RS309-MF-S Cylindrical Bolt-On Fast-Acting Fuse, 750V DC (UL) / 700V AC/DC (IEC), 500A, Size 7TA - Pack of 3
Regular price
$143.00 USD
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$143.00 USD
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Overview
The SINOFUSE RS309-MF-S500A is a cylindrical, bolt-on, fast-acting aR fuse engineered for high-performance DC and AC protection in EV traction, energy storage, and power conversion systems. It features a compact size, low I²t, and high interrupting capacity with strong resistance to vibration and harsh environments. Sold as a pack of 3.
Key Features
- aR fast-acting characteristic with low pre-arcing I²t for semiconductor protection
- High interrupting capacity: AC 100 kA, DC 50 kA (time constant ≤15 ms)
- Rated voltage: AC/DC 700 V (IEC), DC 750 V (UL)
- Robust against vibration, mechanical shock, and wide temperature range
- Standards: UL248, IEC60269; safety and application reliability per ISO8820, GB/T 31465
- Certifications: UL, CE; RoHS compliant
Applications
- Electric vehicle drive/traction power systems
- Power conversion systems and inverters
- Energy storage and battery systems
- Variable frequency controllers and chargers
- Conductors and other on-board equipment short-circuit/back-up protection
Specifications
| Brand | SINOFUSE |
| Series | RS309-MF-S |
| Specific MPN | RS309-MF-S500A |
| Utilization Category | aR (fast-acting, semiconductor protection) |
| Rated Voltage | AC/DC 700 V (IEC); DC 750 V (UL) |
| Rated Current | 500 A |
| Breaking Capacity | AC 100 kA; DC 50 kA (time constant ≤15 ms) |
| Pre-arcing I²t (A²s) | 56,000 |
| Melting I²t (A²s) | 168,000 |
| Power Loss | 105 W (at rated current) |
| Size Code | 7TA |
| Mounting | Bolt-on, M10 bolts; recommended torque 21 ± 1 N·m |
| Standards Compliance | UL248, IEC60269; safety and application reliability per ISO8820, GB/T 31465 |
| Certifications | UL, CE; RoHS compliant |
| Operating Temperature (ambient) | Normal: -5°C to +40°C; Allowed: -40°C to +120°C (derating may apply above 40°C) |
| Altitude | Normal ≤2000 m; allowed ≤4500 m (consider current derating in enclosed installations) |
| Humidity | At 40°C ≤50% RH; at 20°C up to 90% RH; allowed up to 95% RH without noticeable condensation |
| Vibration/Shock | Meets GB2423.10-2008 4.1.2.6, QC/T 413-2002; suitable for road vehicles; rail transit Class II environment |
| Pollution Degree | Class III |
| Recommended Continuous Current | ≤80% of rated current |
| Pack Size | 3 pieces |
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