SINOFUSE RS308-HB-3N Cylindrical Bolt-Connected High-Speed Semiconductor Fuse Series, 160-500A, AC250V/DC170V
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SINOFUSE RS308-HB-3N is a cylindrical bolt-connected high-speed semiconductor fuse family covering nine verified current ratings from 160 A to 500 A. All included 3N models are rated AC 250 V / DC 170 V, use aR partial-range protection, and share rated breaking capacities of 80 kA at AC 250 V and 50 kA at DC 170 V with a 10 ms time constant. The 3N construction uses M10 bolt mounting with a recommended torque of 20 Nm ±1 Nm. This series page consolidates exact purchasable MPNs, I²t values, and power-loss data so procurement, MRO, and engineering buyers can compare verified variants without mixing the 3N family with other RS308-HB size codes.
RS308-HB-3N Series Overview
The manufacturer identifies the RS308-HB family as fast-acting fuses for partial-range protection. The 3N models share the same electrical class and mounting construction while rated current, I²t, and power loss vary by model. The datasheet specifies a minimum breaking current of 5 × In for the 3N size and recommends that long-term continuous current not exceed 0.8 times the fuse rated current.
Technical Specifications
| Specification | RS308-HB-3N Series |
|---|---|
| Product Type | Cylindrical bolt-connected high-speed semiconductor fuse |
| Rated Voltage | AC 250 V / DC 170 V |
| Utilization Category | aR, partial-range protection |
| Rated Breaking Capacity | 80 kA at AC 250 V; 50 kA at DC 170 V, 10 ms time constant |
| Minimum Breaking Current | 5 × In |
| Mounting | M10 mounting bolt; recommended torque 20 Nm ±1 Nm |
| Unit Weight | 73.7 ±3 g |
| Performance References | IEC 60269-4; UL 248-13 |
| Environmental Reliability References | ISO 8820; JASO D622; GB/T 31465 |
| Compliance | RoHS compliant |
Technical data reference: SINOFUSE RS308-HB AC250V/DC170V Cylindrical Bolt-Connected Fast-Acting Fuse Selection Specification, document ZR/YC-0009 A5.
RS308-HB-3N Model Selection
The RS308-HB-3N selection includes nine rated-current options from 160 A through 500 A. Compare the required rated current together with pre-arcing I²t, fusing I²t, and power loss when selecting a model for the protected circuit. Confirm the AC/DC voltage requirements, aR protection category, M10 mechanical connection, complete MPN, and equipment requirements before ordering or replacing an installed fuse.
Variant Model Matrix
| Exact MPN | Rated Current | Pre-Arcing I²t | Fusing I²t | Power Loss at 0.5 In | Power Loss at In |
|---|---|---|---|---|---|
| RS308-HB-3N160A | 160 A | 10,279 A²s | 50,001 A²s | 4.3 W | 17.3 W |
| RS308-HB-3N180A | 180 A | 13,084 A²s | 63,645 A²s | 4.9 W | 19.5 W |
| RS308-HB-3N200A | 200 A | 16,560 A²s | 80,550 A²s | 5.4 W | 21.6 W |
| RS308-HB-3N250A | 250 A | 29,440 A²s | 143,200 A²s | 6.5 W | 25.9 W |
| RS308-HB-3N315A | 315 A | 55,967 A²s | 272,231 A²s | 7.7 W | 30.9 W |
| RS308-HB-3N350A | 350 A | 73,804 A²s | 358,994 A²s | 8.4 W | 33.7 W |
| RS308-HB-3N400A | 400 A | 98,951 A²s | 481,311 A²s | 9.7 W | 38.9 W |
| RS308-HB-3N450A | 450 A | 138,204 A²s | 672,244 A²s | 10.6 W | 42.6 W |
| RS308-HB-3N500A | 500 A | 184,000 A²s | 895,000 A²s | 11.7 W | 46.8 W |
The listed I²t figures are manufacturer typical values measured under a standard test environment of AC 277 V with a 0.2 power factor.
Verified Applications
The manufacturer identifies the RS308-HB family for short-circuit and backup protection of semiconductor equipment including variable-frequency drives, rectifiers, inverters, and power supplies. The datasheet also identifies batteries, motors, capacitors, and related equipment and components as applications for short-circuit and backup protection.
B2B Sourcing and Replacement Support
Apexon Supply provides independent B2B sourcing support for the SINOFUSE RS308-HB-3N series, including exact-model identification and variant comparison for procurement and replacement requirements. Confirm electrical ratings, mechanical fit, protection requirements, and the complete installed MPN before replacing an existing fuse.
For RFQ review, submit the required RS308-HB-3N model, rated current, quantity, and relevant equipment or application requirements. Apexon Supply can review sourcing options and technical alignment for industrial purchasing, MRO, OEM, and difficult-to-find replacement needs.
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