The SINOFUSE RSZ307-3-RAZ series is a family of 1500VDC bolt-connected high-speed fuses designed for partial-range protection in high-power DC electrical systems. The manufacturer series covers rated currents from 100A to 630A with a rated breaking capacity of 250kA.
At Apexon Supply, this collection brings together available RSZ307-3-RAZ models for industrial DC power protection, power-electronics equipment, energy-storage systems, inverters, converters, and other applications requiring high-speed fault interruption.
RSZ307-3-RAZ Series Overview
| Manufacturer |
SINOFUSE |
| Series |
RSZ307-3-RAZ |
| Product Type |
Bolt-Connected Partial-Range High-Speed Fuse |
| Rated Voltage |
1500VDC |
| Rated Current Range |
100A–630A |
| Rated Breaking Capacity |
250kA |
| Time Constant |
≤5ms |
| Size |
Size 3 |
| Mounting |
M8 bolted connection with spring washer |
| Recommended Torque |
11 ±1 N·m |
| Performance Reference |
IEC 60269-4 / UL 248-13 |
| Certification / Compliance |
UL / TÜV / RoHS |
Available Current Ratings
The manufacturer RSZ307-3-RAZ series includes twelve rated-current options:
100A | 125A | 160A | 200A | 250A | 315A | 350A | 400A | 450A | 500A | 550A | 630A
Apexon Supply currently lists selected models from this range. Additional current ratings can be reviewed for RFQ and project-based sourcing.
Why I²t and Power Loss Matter
High-speed fuse selection requires more than matching rated current and voltage. Pre-arcing I²t and total clearing I²t describe the fault-energy characteristics of the fuse and are important when coordinating protection for power-electronic equipment.
Power loss also increases across the current range and should be considered when evaluating enclosure temperature, busbar design, cooling, and continuous operating conditions.
Two fuses with the same nominal current and voltage should therefore not automatically be treated as interchangeable if their I²t characteristics, mounting arrangement, breaking capacity, or thermal performance differ.
Typical Applications
Depending on the specific equipment and protection design, RSZ307-3-RAZ high-speed fuses may be considered for:
- High-voltage DC power systems
- Power converters and inverters
- Energy-storage systems
- DC bus protection
- Power-semiconductor protection circuits
- Industrial power-electronics equipment
- High-current DC distribution systems
Final fuse selection should always be based on the electrical, thermal, mechanical, and fault-current requirements of the specific system.
Selecting the Correct RSZ307-3-RAZ Fuse
Before selecting a replacement or new RSZ307-3-RAZ fuse, verify:
- Complete manufacturer part number
- Rated current
- 1500VDC system voltage
- Required breaking capacity
- Pre-arcing I²t
- Total clearing I²t
- Power loss
- Size 3 mechanical fit
- M8 mounting arrangement
- Installation and thermal conditions
B2B Sourcing and RFQ Support
Apexon Supply supports industrial buyers with:
- Exact RSZ307-3-RAZ part-number sourcing
- Manufacturer specification review
- I²t and power-loss verification
- Product-label and model checking
- RFQ and bulk quotation support
- Proforma invoice preparation
- International delivery coordination
For faster quotation, provide the complete RSZ307-3-RAZ model number, required quantity, product-label photo, and delivery country.
Browse additional SINOFUSE fuse products for EV, energy-storage, photovoltaic, industrial power-electronics, and other circuit-protection applications.
Request a quote for SINOFUSE RSZ307-3-RAZ fuses
Independent Supplier Notice
Apexon Supply is an independent industrial parts sourcing supplier and is not presented as an authorized SINOFUSE distributor or representative. SINOFUSE trademarks, model numbers, product names, and part numbers belong to their respective owners and are used solely for product identification, technical reference, and procurement purposes.
Need complete model, I²t and power-loss data? Read the SINOFUSE RSZ307-3-RAZ 1500VDC High-Speed Fuse Selection Guide.
