SINOFUSE RS309-MF-EV Cylindrical Bolt-Connected Fuse Series, 20–100A, AC/DC 750V
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SINOFUSE RS309-MF-EV is a cylindrical bolt-connected fuse series for electric-vehicle and related DC power applications. This page covers the verified 3SA models rated from 20 A through 100 A. Across this included range, the series is rated AC/DC 750 V, uses the gR utilization category under IEC, and is specified with an AC breaking capacity of 100 kA and DC breaking capacity of 50 kA with a time constant of no more than 15 ms. All included models use M8 bolt installation with a recommended torque of 12 ± 1 N·m. The series format lets procurement teams compare exact current ratings, I²t values, and power loss before RFQ review.
RS309-MF-EV Series Overview
The RS309-MF-EV series is designed as a compact cylindrical fuse with bolted electrical connections and high breaking capacity. SINOFUSE specifies the series for short-circuit, overload, and backup protection in road-vehicle electrical applications. The included 3SA range provides twelve rated-current selections from 20 A to 100 A while retaining the same voltage rating, utilization category, mounting arrangement, and mechanical size code. Manufacturer documentation also states compliance with IEC 60269, ISO 8820, and GB/T 31465, together with CE certification and RoHS compliance.
Technical Specifications
| Specification | Series Data |
|---|---|
| Rated Voltage | AC/DC 750 V |
| Rated Current Range | 20–100 A |
| Utilization Category | gR (IEC) |
| Breaking Capacity | AC 100 kA; DC 50 kA, time constant ≤15 ms |
| Size Code | 3SA |
| 3SA Dimensions | A 110 ±2 mm; B 20 ±0.5 mm; C 66 ±0.5 mm; D 84 ±1.5 mm; E 95.5 ±1.5 mm; F 9 ±1 mm; G 15 ±1 mm; H 3.3 ±0.2 mm |
| Installation | M8 mounting bolts; recommended torque 12 ± 1 N·m |
| Standards and Compliance | IEC 60269, ISO 8820, GB/T 31465; CE certified; RoHS compliant |
Technical data reference: SINOFUSE RS309-MF-EV Cylindrical Bolt-Connected Fuse Selection Specification, document ZR/YC-0017-05 S1.
RS309-MF-EV Model Selection
The included 3SA range provides twelve rated-current options from 20 A to 100 A. Select the required model by comparing rated current, pre-arcing I²t, fusing I²t, and power loss against the requirements of the protected circuit or equipment. SINOFUSE recommends long-term continuous current not exceed 80% of fuse rated current under the stated normal-use conditions. Confirm the complete model, AC/DC 750 V rating, gR category, 3SA dimensions, and M8 connection requirements before replacement or ordering.
| Exact MPN | Rated Current | Pre-Arcing I²t | Fusing I²t | Power Loss |
|---|---|---|---|---|
| RS309-MF-EV20A | 20 A | 120 A²s | 310 A²s | 2 W |
| RS309-MF-EV25A | 25 A | 180 A²s | 460 A²s | 3 W |
| RS309-MF-EV30A | 30 A | 210 A²s | 550 A²s | 5 W |
| RS309-MF-EV35A | 35 A | 330 A²s | 670 A²s | 7 W |
| RS309-MF-EV40A | 40 A | 430 A²s | 1020 A²s | 8 W |
| RS309-MF-EV45A | 45 A | 850 A²s | 1660 A²s | 9 W |
| RS309-MF-EV50A | 50 A | 1020 A²s | 1850 A²s | 9.5 W |
| RS309-MF-EV60A | 60 A | 1200 A²s | 2800 A²s | 10 W |
| RS309-MF-EV70A | 70 A | 1680 A²s | 3400 A²s | 11 W |
| RS309-MF-EV80A | 80 A | 2100 A²s | 6800 A²s | 12.5 W |
| RS309-MF-EV90A | 90 A | 3110 A²s | 9900 A²s | 13 W |
| RS309-MF-EV100A | 100 A | 4130 A²s | 11800 A²s | 14 W |
Verified Applications
SINOFUSE identifies applications including electric-vehicle drive power systems, power conversion systems, energy-storage and power systems, variable-frequency controllers, chargers, conductors, and other automotive components and equipment. The series is specified for short-circuit, overload, and backup protection within these applications.
B2B Sourcing and Replacement Support
Apexon Supply provides independent B2B sourcing support for the SINOFUSE RS309-MF-EV series. For replacement sourcing, verify the complete MPN together with rated current, I²t requirements, power loss, 3SA mechanical dimensions, M8 connection, and the electrical requirements of the protected equipment. Technical alignment should be confirmed before substituting or replacing an installed fuse.
For RFQ review, submit the complete MPN, required rated current, quantity, and application requirements. Apexon Supply can assist procurement teams, OEM buyers, integrators, and maintenance organizations with exact-model sourcing and difficult-to-find industrial component requirements.
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