SINOFUSE RSZ307-5-DAV Series 1500VDC High-Speed Fuse for Energy Storage Systems
The SINOFUSE RSZ307-5-DAV Series is a high-speed bolted DC fuse family designed for short-circuit protection in high-voltage electrical systems. Rated at DC 1500V, the series covers current ratings from 450A to 1800A and uses the aR utilization category.
According to the SINOFUSE manufacturer specification ZR/YC-0395 S1, the RSZ307-5-DAV Series features high current-limiting capability and high DC breaking capacity. It is intended for demanding applications including battery energy storage systems, wind power equipment, power systems, and associated electrical protection installations.
The manufacturer provides 14 models with individual pre-arcing I²t, total clearing I²t, and power-loss data. These characteristics should be reviewed together with system voltage, prospective short-circuit current, DC time constant, and installation conditions when selecting the appropriate fuse.
RSZ307-5-DAV Series Technical Specifications
- Manufacturer: SINOFUSE
- Series: RSZ307-5-DAV
- Product Type: Bolted high-speed DC fuse
- Rated Voltage: DC 1500V
- Rated Current Range: 450A to 1800A
- Utilization Category: aR
- DC Breaking Capacity: 150kA at 10–15ms time constant
- Additional DC Breaking Rating: 250kA at ≤5ms time constant
- Performance References: IEC 60269 / UL 248
- Manufacturer-Listed Certifications: CE, UL and TÜV
- Environmental Compliance: RoHS
- Mechanical Size Code: 5
- Mounting Thread: M12
- Recommended Nut Tightening Torque: 46 ±2 N·m
- Typical Weight: 4430 ±100g
Certification Note: The manufacturer datasheet lists CE, UL and TÜV certifications. Where certification is mandatory for a particular project, the applicable approval documentation and coverage for the exact selected model should be verified.
DC Breaking Capacity and Time Constant
An important characteristic of the RSZ307-5-DAV Series is its manufacturer-specified DC breaking capacity under different circuit time constants.
| DC Breaking Capacity | Specified Time Constant |
|---|---|
| 150kA | 10–15ms |
| 250kA | ≤5ms |
These two ratings must be interpreted together with their respective circuit conditions. The higher 250kA value should not be treated as an unconditional breaking-capacity rating for every DC installation.
When selecting a high-speed DC fuse, engineers should verify the prospective short-circuit current, circuit time constant, system voltage, and applicable manufacturer test conditions.
RSZ307-5-DAV Complete Model Range
The manufacturer specifies 14 RSZ307-5-DAV models across the 450A–1800A series range.
The following table reproduces the manufacturer-published model designations, current data, pre-arcing I²t, total clearing I²t, and power-loss values.
| Manufacturer Model | Rated Current in Datasheet (A) | Pre-Arcing I²t (A²s) | Total Clearing I²t (A²s) | Power Loss (W) |
|---|---|---|---|---|
| RSZ307-5-DAV-450A1500V | 450 | 35,376 | 159,442 | 198 |
| RSZ307-5-DAV-500A1500V | 500 | 47,429 | 213,767 | 211 |
| RSZ307-5-DAV-550A1500V | 550 | 63,721 | 287,195 | 220 |
| RSZ307-5-DAV-630A1500V | 630 | 97,235 | 438,245 | 234 |
| RSZ307-5-DAV-700A1500V | 700 | 134,154 | 604,644 | 246 |
| RSZ307-5-DAV-800A1500V | 800 | 198,438 | 894,378 | 264 |
| RSZ307-5-DAV-900A1500V | 900 | 285,751 | 1,287,904 | 279 |
| RSZ307-5-DAV-1000A1500V | 1000 | 388,939 | 1,752,981 | 295 |
| RSZ307-5-DAV-1100A1500V | 1100 | 515,083 | 2,321,518 | 310 |
| RSZ307-5-DAV-1250A1500V | 1250 | 758,868 | 3,420,278 | 330 |
| RSZ307-5-DAV-1400A1500V | 1350* | 1,070,122 | 4,823,127 | 349 |
| RSZ307-5-DAV-1500A1500V | 1500 | 1,307,269 | 5,891,964 | 362 |
| RSZ307-5-DAV-1600A1500V | 1600 | 1,593,020 | 7,179,868 | 373 |
| RSZ307-5-DAV-1800A1500V | 1800 | 2,260,000 | 10,186,000 | 396 |
*Manufacturer Data Verification Note: The manufacturer datasheet identifies the model as RSZ307-5-DAV-1400A1500V, and the published time-current curve also identifies a 1400A model. However, the corresponding rated-current cell in the model table is printed as 1350A. This discrepancy should be confirmed with SINOFUSE before using the rating for final engineering selection.
Technical Data Note: I²t and power-loss values are reproduced from the manufacturer specification. Engineers should evaluate the applicable test conditions and complete protection requirements when using these values for fuse coordination.
Understanding I²t Characteristics
I²t characteristics are important when evaluating high-speed fuses for electrical systems in which limiting fault energy is necessary.
Pre-arcing I²t represents the current-squared integral accumulated before the fuse element melts. Total clearing I²t represents the corresponding integral accumulated through the complete interruption process.
For the RSZ307-5-DAV Series, these values increase significantly across the manufacturer's current range. Selecting a fuse should therefore involve more than matching the rated current.
Engineers should review the fuse I²t characteristics together with the protection requirements of connected electrical equipment and the expected fault conditions.
Mechanical Dimensions
The RSZ307-5-DAV Series uses the manufacturer's size code 5 mechanical configuration.
According to the manufacturer dimensional drawing, the fuse assembly includes the following dimensions and mounting details:
- Overall Length: 150 ±2.5mm
- Additional Longitudinal Dimension: 141 ±2.5mm
- Maximum Dimension Shown Across Mounting Face: 122 ±2.5mm
- Mounting Face Dimension: 105 ±2.5mm
- Mounting Hole Pattern: 4 × M12 threaded holes
- Threaded Hole Depth: 10.5mm
- Dimension Between Threaded Hole Centers Shown: 40 ±1mm
- Parallelism of Contact End Faces: 0.5mm
- Manufacturer-Specified Weight: 4430 ±100g
These dimensions should be interpreted together with the original manufacturer drawing. For replacement applications, the complete installation dimensions and terminal interface should be verified before ordering.
Mounting and Installation Requirements
SINOFUSE specifies bolted installation requirements for the RSZ307-5-DAV Series.
- Thread Size: M12
- Maximum Stud Engagement During Installation: 11mm
- Recommended Nut Tightening Torque: 46 ±2 N·m
- Preferred Installation: Stud mounting
The manufacturer specifies that the stud must not rotate while the nut is being tightened.
The manufacturer does not provide a recommended torque for threading the stud into the fuse body. Instead, the specified insertion depth must be respected.
Correct mounting hardware, stable electrical contact, and appropriate tightening procedures are important for reliable electrical and thermal performance.
Indicator and Non-Indicator Variants
The manufacturer provides a model suffix option for applications that do not require the visual indicator and base.
According to the datasheet, adding the suffix -N identifies the version without the visual indicator and base.
For example:
- Standard Model: RSZ307-5-DAV-1800A1500V
- Non-Indicator Version: RSZ307-5-DAV-1800A1500V-N
When selecting a replacement fuse, the required indicator configuration and mechanical assembly should be verified against the installed equipment.
Typical Applications
According to the SINOFUSE manufacturer specification, the RSZ307-5-DAV Series is intended for short-circuit protection in demanding high-voltage electrical systems.
Battery Energy Storage Systems
Battery energy storage systems can involve significant DC fault currents. High-speed fuse selection requires consideration of the system voltage, prospective short-circuit current, circuit time constant, and applicable protection coordination.
The RSZ307-5-DAV Series is specified for energy storage applications where its electrical characteristics meet the system requirements.
Wind Power Systems
SINOFUSE identifies wind power applications as one of the intended application areas for this fuse family.
Selection should account for the relevant DC circuit configuration, fault-current conditions, mounting arrangement, and operating environment.
Industrial Power Systems
The manufacturer also identifies power systems and related electrical equipment as applications for RSZ307-5-DAV short-circuit protection.
In these installations, the fuse should be evaluated together with other protective devices and the electrical characteristics of the protected equipment.
Understanding the aR Protection Category
The RSZ307-5-DAV Series uses the aR utilization category.
The aR category identifies partial-range high-speed fuse protection intended for specified fault-current conditions.
It should not automatically be treated as full-range overload protection.
Appropriate system protection coordination may require other protective devices to address operating conditions outside the fuse's specified interruption range.
Continuous Current Recommendation
The manufacturer recommends that long-term continuous operating current should not exceed 80% of the fuse rated current under normal operating conditions.
Applications involving elevated ambient temperature, enclosed installations, high altitude, or other demanding environmental conditions may require additional current correction or technical evaluation.
Operating and Storage Conditions
- Normal Ambient Temperature: -5°C to 40°C
- Permitted Ambient Temperature: -40°C to 85°C
- Product Storage Temperature: -40°C to 120°C
- Packaged Storage Temperature: -40°C to 70°C
- Normal Operating Altitude: Up to 2000m
- Permitted Operating Altitude: Up to 4500m
- Pollution Degree: Class III
For ambient temperatures above 40°C, the manufacturer specifies the need to consider current correction based on the applicable temperature correction factor.
High-Altitude Application Considerations
Higher altitude can affect fuse thermal performance, air pressure, and electrical insulation strength.
For certain enclosed installations where internal temperatures remain elevated at higher altitude, the manufacturer provides a rated-current derating guideline of approximately 2% to 5% per 1000m.
The manufacturer also notes that air insulation strength can decrease by approximately 12% to 15% per 1000m within the 2000m–4500m altitude range.
Engineers should therefore evaluate electrical clearances, thermal conditions, and current derating for installations above the normal altitude range.
Vibration and Mechanical Reliability
The manufacturer specifies that the RSZ307-5-DAV Series has vibration and mechanical impact resistance suitable for general motor-vehicle operating environments and rail-transport vibration Class II applications.
For installations involving unusually severe vibration or mechanical stress, additional testing and application evaluation may be required.
Safety and Maintenance Considerations
The manufacturer recommends periodic inspection and maintenance as part of the electrical equipment maintenance program.
- Maintain suitable electrical clearances between adjacent live components.
- Use additional insulation barriers where required.
- Inspect electrical contacts for dust, contamination, and oxidation.
- Replace fuses showing mechanical damage.
- Do not replace fuses under load unless the equipment and applicable operating requirements explicitly permit the procedure.
- Verify mounting hardware and electrical contact integrity before returning equipment to service.
RSZ307-5-DAV Model Selection Checklist
Before selecting an RSZ307-5-DAV fuse, engineers and procurement professionals should verify:
- Exact manufacturer model number
- DC operating voltage
- Required rated current
- Prospective DC short-circuit current
- Applicable DC circuit time constant
- Required pre-arcing and total clearing I²t characteristics
- Power loss and thermal conditions
- Mechanical dimensions and mounting interface
- Stud insertion depth and nut tightening torque
- Indicator or non-indicator configuration
- Ambient temperature and installation altitude
- Project-specific certification requirements
Browse SINOFUSE RSZ307-5-DAV Models
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For model selection, product information, availability inquiries, and quotation requests, visit:
View SINOFUSE RSZ307-5-DAV 1500VDC High-Speed Fuse Options
Related SINOFUSE Technical Resources
Explore additional SINOFUSE high-speed fuse families and related technical information:
- SINOFUSE Fuse Solutions – Brand & Technical Overview
- SINOFUSE RSZ307-3-RAZ 1500VDC High-Speed Fuse Series
- SINOFUSE RSZ307-5-W7P High-Speed Semiconductor Fuse Series
Series Selection Note: RSZ307-5-DAV, RSZ307-3-RAZ, and RSZ307-5-W7P are separate fuse families. Similar voltage or current ratings do not establish electrical or mechanical interchangeability. Exact replacement suitability should be verified using the applicable manufacturer specifications.
Industrial Sourcing and Technical Support
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For RSZ307-5-DAV availability, product information, or quotation requests, please provide the exact part number, rated current, required quantity, and relevant equipment or application details.
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