SINOFUSE RS308-HB-3H High-Speed Semiconductor Fuse Series, 100-250A, AC250V/DC170V
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SINOFUSE RS308-HB-3H is the 3H size group within the RS308-HB cylindrical bolt-connected fast-acting fuse family. The verified 3H range includes five current ratings from 100 A to 250 A, all rated AC 250 V/DC 170 V and classified for aR partial-range protection. Shared breaking capacity is AC 250 V at 80 kA and DC 170 V at 50 kA with a 10 ms time constant. The 3H format uses M8 installation bolts with a recommended tightening torque of 12 Nm ±1 Nm. This page separates common specifications from model-specific I²t and power-loss data so procurement teams can identify the required rating and verify the complete order number before RFQ or replacement review.
RS308-HB-3H Series Overview
The RS308-HB-3H series is a cylindrical, bolt-connected high-speed fuse configuration intended for partial-range short-circuit and backup protection. SINOFUSE describes the RS308-HB family as having strong current-limiting capability, high breaking capacity and rapid short-circuit interruption. The 3H characteristic data specifies a minimum breaking current of 4 In. The manufacturer also recommends that long-term continuous current not exceed 0.8 times the fuse rated current. Performance references listed for the RS308-HB family include IEC 60269-4 and UL 248-13. The manufacturer document specifically identifies CCC and UL certification for 2G/2G-HT variants, so no such certification claim is made here for the 3H models.
Technical Specifications
| Specification | Common Series Value |
|---|---|
| Product type | Cylindrical bolt-connected high-speed fuse for partial-range protection |
| Utilization category | aR |
| Rated voltage | AC 250 V / DC 170 V |
| Rated current range | 100-250 A |
| Rated breaking capacity | AC 250 V at 80 kA; DC 170 V at 50 kA, 10 ms time constant |
| Installation | M8 installation bolts; recommended torque 12 Nm ±1 Nm |
| Minimum breaking current | 4 In |
| Unit weight | 73.7 ±3 g |
Technical data reference: SINOFUSE “RS308-HB AC250V/DC170V Cylindrical Bolt-Connected Fast-Acting Fuse Selection Specification,” document ZR/YC-0009 A5.
RS308-HB-3H Model Selection
The verified 3H selection range contains 100 A, 125 A, 160 A, 200 A and 250 A ratings. Select the required model first by rated current, then compare the associated pre-arcing I²t, fusing I²t and power-loss values with the protected circuit and thermal requirements. All five models share the same 3H family format, AC/DC voltage rating and aR utilization category. Confirm the complete MPN and the equipment electrical and mechanical requirements before ordering or using a replacement.
| Exact MPN | Rated Current | Pre-Arcing I²t | Fusing I²t | Power Loss at 0.5 In | Power Loss at In |
|---|---|---|---|---|---|
| RS308-HB-3H100A | 100 A | 791 A²s | 5,217 A²s | 2.7 W | 11.0 W |
| RS308-HB-3H125A | 125 A | 1,237 A²s | 8,151 A²s | 3.4 W | 13.8 W |
| RS308-HB-3H160A | 160 A | 2,199 A²s | 14,492 A²s | 4.3 W | 17.2 W |
| RS308-HB-3H200A | 200 A | 4,158 A²s | 27,399 A²s | 4.9 W | 19.9 W |
| RS308-HB-3H250A | 250 A | 7,028 A²s | 46,305 A²s | 6.2 W | 24.5 W |
The listed I²t values are manufacturer typical data measured under the specified standard test environment at AC 277 V with power factor 0.2. The datasheet states that its test data are measured under AC conditions, with test parameters and connections according to IEC 60269 requirements.
Verified Applications
Manufacturer-listed applications include variable-frequency drives, rectifiers, inverters, various power supplies and other semiconductor equipment, as well as batteries, motors and capacitors. The stated protection function is short-circuit and backup protection.
B2B Sourcing and Replacement Support
Apexon Supply provides B2B sourcing support for the SINOFUSE RS308-HB-3H series as an independent industrial sourcing supplier. For replacement projects, confirm rated current, AC/DC voltage, aR utilization category, 3H mechanical format, M8 installation requirements and the complete MPN against the protected equipment before purchase.
Submit the complete MPN, selected current rating, quantity and application requirements for RFQ review. Contact Apexon Supply for sourcing options and technical alignment; most qualified RFQs receive a response or quote within 12 hours.
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