SINOFUSE RS309-MF-S500A Cylindrical Bolt-On High-Speed Fuse, 500 A, 700 V AC/DC (IEC) / 750 V DC (UL)
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The SINOFUSE RS309-MF-S500A is a 500 A cylindrical bolt-on high-speed fuse in the RS309-MF-S series. It has an aR utilization category and size code 7TA. Its voltage ratings are 700 V AC/DC under IEC and 750 V DC under UL.
| Model | RS309-MF-S500A |
| Rated current | 500 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: 56,000 A²s; total clearing: 168,000 A²s. Datasheet test values were measured under DC conditions, with time constants and connections referenced to IEC 60269 / UL 248. |
| Power dissipation | 105 W |
| Size code | 7TA |
| Mounting | Bolt-on; M10 bolts; recommended tightening 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. Include the existing fuse label, mounting dimensions, circuit voltage, and protection requirements for replacement comparisons.
Request a quotation: Send your RFQ for SINOFUSE RS309-MF-S500A with the required quantity, destination, and documentation requirements.
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