SINOFUSE RSZ307-5-W7P Series 1200VDC High-Speed Semiconductor Fuse
The SINOFUSE RSZ307-5-W7P Series is a high-current, high-speed fuse family designed for demanding DC power protection applications. The series covers rated currents from 1000A to 2500A and is rated at DC1200V under UL specifications and DC1000V under IEC specifications.
RSZ307-5-W7P fuses use an aR utilization category and are designed for short-circuit and backup protection in power, rectification, power conversion, and other high-current power-electronic systems.
RSZ307-5-W7P Series Technical Specifications
- Manufacturer: SINOFUSE
- Series: RSZ307-5-W7P
- Product Type: High-speed bolted fuse
- Rated Voltage: DC1200V (UL) / DC1000V (IEC)
- Rated Current Range: 1000A to 2500A
- Utilization Category: aR
- Breaking Capacity: 100kA
- DC Time Constant: 10-15ms
- Performance Reference: IEC 60269 and UL 248.13
- Certification: UL
- Environmental Compliance: RoHS
Typical Applications
According to the manufacturer specification, the RSZ307-5-W7P Series is intended for high-current electrical protection in applications including:
- Power systems
- Rectifier systems
- Power conversion equipment
- High-current DC power circuits
- Power-electronic equipment
- Short-circuit protection
- Backup protection
RSZ307-5-W7P Model Range
The RSZ307-5-W7P family is available in ten rated-current options from 1000A to 2500A.
| Model | Rated Current | Pre-Arcing I²t | Total I²t | Power Loss at 0.5In | Power Loss at In |
|---|---|---|---|---|---|
| RSZ307-5-W7P-1000A1200V | 1000A | 371 kA²s | 1073 kA²s | 38W | 179W |
| RSZ307-5-W7P-1250A1200V | 1250A | 590 kA²s | 1710 kA²s | 47W | 228W |
| RSZ307-5-W7P-1400A1200V | 1400A | 780.5 kA²s | 2264 kA²s | 52W | 248W |
| RSZ307-5-W7P-1500A1200V | 1500A | 942 kA²s | 2731 kA²s | 54W | 258W |
| RSZ307-5-W7P-1700A1200V | 1700A | 1244 kA²s | 3606 kA²s | 61W | 290W |
| RSZ307-5-W7P-1800A1200V | 1800A | 1480 kA²s | 4292 kA²s | 62W | 296W |
| RSZ307-5-W7P-2000A1200V | 2000A | 1854 kA²s | 5375 kA²s | 69W | 323W |
| RSZ307-5-W7P-2200A1200V | 2200A | 2360 kA²s | 6835 kA²s | 73W | 347W |
| RSZ307-5-W7P-2400A1200V | 2400A | 2871 kA²s | 8327 kA²s | 78W | 354W |
| RSZ307-5-W7P-2500A1200V | 2500A | 3330 kA²s | 9320 kA²s | 88W | 375W |
The manufacturer specifies the above I²t values at a nominal test condition of DC1220V.
Mechanical and Mounting Information
- Size Code: 5
- Connection: Bolted flat-terminal construction
- Mounting Hardware: M10 studs and nuts
- Recommended Tightening Torque: 21 ±1 N·m
- Typical Product Weight: 3350g ±5%
The manufacturer specifies a main body diameter of approximately 56mm and a bolt-terminal mechanical construction designed for high-current installations.
Electrical Protection Characteristics
The RSZ307-5-W7P Series uses an aR operating class and is intended primarily for short-circuit and backup protection. The manufacturer specifies a minimum breaking current of at least 8 times the rated current.
For system design and fuse selection, engineers should consider rated voltage, rated current, prospective fault current, I²t characteristics, power loss, conductor sizing, thermal conditions, and the protection requirements of the connected power-electronic equipment.
Continuous Current Recommendation
According to the manufacturer specification, the recommended long-term continuous operating current should not exceed 80% of the fuse rated current under normal operating conditions.
Operation outside the specified normal environmental conditions may require current derating or additional application evaluation.
Operating Environment
- Normal Ambient Temperature: -5°C to 40°C
- Permitted Ambient Temperature: -40°C to 85°C
- Product Storage Temperature: -40°C to 120°C
- Normal Operating Altitude: Up to 2000m
- Permitted Altitude: 2000m to 4500m with appropriate application review and derating where required
- Pollution Degree: III
High-Altitude and High-Temperature Applications
The manufacturer notes that applications above 40°C may require rated-current correction. At higher altitudes, changes in thermal performance and air insulation strength should also be considered.
For enclosed installations at elevated altitude, the manufacturer indicates that current derating may be required. System designers should verify the actual enclosure temperature, airflow, insulation clearance, and operating environment before final selection.
Vibration and Mechanical Resistance
The RSZ307-5-W7P Series is designed with resistance to vibration and mechanical shock. According to the manufacturer specification, the fuse can withstand horizontal acceleration above 10g and its vibration and shock resistance references GB/T 28046.3 passenger-vehicle flexible-body vibration requirements.
Browse RSZ307-5-W7P Models
Apexon Supply provides the complete RSZ307-5-W7P 1000A-2500A range through a single multi-variant product page:
View SINOFUSE RSZ307-5-W7P 1000A-2500A Fuse Options
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