SINOFUSE RS309-MF-S800A RS309-MF-S Series High-Speed Fuse, 800A, 700V AC/DC / 750V, aR
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The SINOFUSE RS309-MF-S800A is an 800 A cylindrical, bolt-mounted high-speed fuse in the RS309-MF-S series, with an aR utilization category. Its rated voltage is 700 V AC/DC under IEC and 750 V DC under UL. Installation uses M10 bolts with a recommended tightening torque of 21 ± 1 N·m.
| Model | RS309-MF-S800A |
| Rated current | 800 A |
| Rated voltage | IEC: 700 V AC/DC; UL: 750 V DC |
| Utilization category | aR |
| Breaking capacity | AC: 100 kA; DC: 50 kA at a time constant ≤ 15 ms |
| I²t values | Pre-arcing: 124,000 A²s; total clearing: 428,000 A²s. Datasheet test values were measured under DC conditions, with time constants and connections referenced to IEC 60269 / UL 248. |
| Power dissipation | 140 W |
| Size code | 7TA |
| Mounting | Bolt-mounted; M10 bolts; recommended torque 21 ± 1 N·m |
Typical applications: Short-circuit protection in electric vehicle drive systems, power conversion equipment, energy storage systems, variable-frequency controllers, and chargers, subject to application-specific selection and protection coordination.
B2B sourcing and replacement support: Submit the exact model and equipment requirements to Apexon Supply for a sourcing enquiry. For replacement enquiries, include the existing fuse label, mounting dimensions, circuit voltage, and protection requirements for technical comparison.
Request a quotation: Send your RFQ for SINOFUSE RS309-MF-S800A with the required quantity, destination, and documentation requirements.
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