SINOFUSE RS306-2-T5Z High-Speed Fuse Series, 250–800A, AC1250V, aR
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SINOFUSE RS306-2-T5Z is an AC1250V high-speed fuse series covering ten verified current ratings from 250A to 800A. The series uses utilization category aR for partial-range protection and size code 2 construction. Manufacturer data specifies an AC breaking capacity of 100kA, with low I²t, current-limiting capability and high breaking capacity as key characteristics. All included models share the same voltage class, protection category and mounting family, while rated current, pre-arcing I²t, total I²t and power loss vary by model. This page organizes the exact purchasable MPNs for technical comparison, replacement review and B2B RFQ preparation.
RS306-2-T5Z Series Overview
The RS306-2-T5Z family includes ten exact models rated 250A, 315A, 350A, 400A, 450A, 500A, 550A, 630A, 700A and 800A. The manufacturer states that the fuse construction and performance conform to IEC 60269 and UL 248 and identifies RoHS and CE compliance. Installation uses M10 hardware with a recommended mounting torque of 32 ±1 N·m. Manufacturer documentation also states a minimum breaking current of at least 8 × In and recommends long-term continuous current not exceeding 80% of the fuse rated current.
Technical Specifications
| Specification | Series Data |
|---|---|
| Product Type | High-speed partial-range fuse |
| Rated Voltage | AC1250V |
| Rated Current Range | 250A–800A |
| Utilization Category | aR |
| Breaking Capacity | AC 100kA |
| Minimum Breaking Current | ≥ 8 × In |
| Size Code | 2 |
| Mounting | M10 mounting bolts; recommended torque 32 ±1 N·m |
| Normal Ambient Temperature | -5°C to 40°C |
| Standards / Compliance | IEC 60269, UL 248; RoHS, CE |
Technical data reference: SINOFUSE RS306-2-T5Z&S5P&Q5Z 1250V High-Speed Fuse Selection Specification, document ZR/YC-0022-04 A2.
RS306-2-T5Z Model Selection
The RS306-2-T5Z series provides ten verified rated-current options from 250A through 800A. Select the required model according to rated current, pre-arcing I²t, total I²t and power loss, while confirming the AC1250V rating, aR utilization category, size code 2 construction and M10 installation requirements of the equipment. Higher-current models have correspondingly different I²t and power-loss characteristics, so these values should be checked against the protected circuit rather than selecting by current rating alone. Confirm the complete MPN and electrical and mechanical requirements before replacement.
| Exact MPN | Rated Current | Pre-Arcing I²t | Total I²t | Loss @ 0.5In | Loss @ In |
|---|---|---|---|---|---|
| RS306-2-T5Z-250A1250V | 250A | 9,000 A²s | 61,000 A²s | 12 W | 72 W |
| RS306-2-T5Z-315A1250V | 315A | 17,000 A²s | 112,000 A²s | 14.5 W | 85 W |
| RS306-2-T5Z-350A1250V | 350A | 22,000 A²s | 150,000 A²s | 16.5 W | 92 W |
| RS306-2-T5Z-400A1250V | 400A | 32,000 A²s | 210,000 A²s | 19 W | 100 W |
| RS306-2-T5Z-450A1250V | 450A | 45,000 A²s | 298,000 A²s | 21 W | 108 W |
| RS306-2-T5Z-500A1250V | 500A | 61,000 A²s | 402,000 A²s | 23.5 W | 115 W |
| RS306-2-T5Z-550A1250V | 550A | 80,000 A²s | 521,000 A²s | 26 W | 122 W |
| RS306-2-T5Z-630A1250V | 630A | 114,000 A²s | 744,000 A²s | 30 W | 135 W |
| RS306-2-T5Z-700A1250V | 700A | 160,000 A²s | 1,043,000 A²s | 32.5 W | 141 W |
| RS306-2-T5Z-800A1250V | 800A | 240,000 A²s | 1,562,000 A²s | 36 W | 155 W |
Verified Applications
SINOFUSE identifies the RS306-2 family for applications including rail transportation, electric vehicles and marine systems. The manufacturer also states that the fuse can provide short-circuit backup protection for energy-storage systems, power systems, conductors and other equipment or components. Final model selection should be based on the requirements of the protected circuit and the manufacturer's installation and derating guidance.
B2B Sourcing and Replacement Support
Apexon Supply provides B2B sourcing support for the SINOFUSE RS306-2-T5Z series, including exact-model identification and technical alignment for industrial procurement and replacement requirements. Confirm rated current, AC1250V rating, aR utilization category, I²t characteristics, power loss, size code and mounting requirements before replacing an existing fuse.
For RFQ review, submit the complete MPN, required rated current, quantity and application requirements. Apexon Supply can review sourcing options and help align the requested RS306-2-T5Z model with the documented electrical and mechanical specifications before ordering.
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