SinoFuse RS309-MF-S325A 325A High-Speed Cylindrical Fuse, 700V AC/DC IEC, 750V DC UL, aR, Size 6TA
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SinoFuse RS309-MF-S325A High-Speed Fuse
The SinoFuse RS309-MF-S325A is a 325A high-speed cylindrical fuse from the RS309-MF-S series, featuring bolted connections and an aR utilization category.
Rated for 700V AC/DC under IEC specifications and 750V DC under UL specifications, this fuse is designed for high-speed protection in power conversion systems, electric vehicle power systems, energy storage equipment, and industrial electrical applications.
Key Features
- 325A rated current with aR utilization category
- 700V AC/DC rating according to IEC specifications
- 750V DC rating according to UL specifications
- High breaking capacity: 100kA AC and 50kA DC
- Size 6TA cylindrical construction
- M10 bolted mounting connections
- Low pre-arcing I²t characteristics
- Designed for applications requiring resistance to mechanical vibration and shock
Technical Specifications
| Manufacturer | SinoFuse |
| Part Number | RS309-MF-S325A |
| Series | RS309-MF-S |
| Fuse Type | High-Speed Cylindrical Fuse |
| Rated Current | 325A |
| IEC Rated Voltage | 700V AC/DC |
| UL Rated Voltage | 750V DC |
| Utilization Category | aR |
| AC Breaking Capacity | 100kA |
| DC Breaking Capacity | 50kA (time constant ≤15ms) |
| Pre-Arcing I²t | 34,500 A²s |
| Total Clearing I²t | 74,500 A²s |
| Power Dissipation | 60W |
| Size Code | 6TA |
| Mounting | M10 Bolted Connection |
| Recommended Tightening Torque | 21 ± 1 N·m |
Applications
The RS309-MF-S series is designed for electrical protection applications including:
- Electric vehicle drive power systems
- Power conversion equipment
- Energy storage and power systems
- Variable-frequency controllers
- Battery charging equipment
- Industrial power electronics
Installation and Operating Conditions
The manufacturer recommends that long-term continuous operating current should not exceed 80% of the rated current.
Normal ambient operating temperature is -5°C to +40°C. Operation outside this range may require additional current-rating adjustments according to the manufacturer's specifications.
The fuse supports vertical, horizontal, or inclined installation, provided that reliable electrical connections and appropriate installation conditions are maintained.
Standards and Compliance
According to the manufacturer, the RS309-MF-S series conforms to IEC 60269 and UL 248 performance requirements. The manufacturer also states CE and UL certification and RoHS compliance for the series.
For equipment-specific applications, verify electrical ratings, installation dimensions, protection coordination, and applicable certification requirements against the manufacturer's technical documentation.
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