SINOFUSE RS309-MD Series 500V High-Speed Bolt-Connected Fuses
The SINOFUSE RS309-MD Series is a cylindrical bolt-connected high-speed fuse family designed for demanding AC and DC protection applications. Rated at AC/DC 500V, the series covers a broad current range from 35A to 1200A for electric vehicle, power conversion, energy storage, charging, and industrial power-electronic systems.
RS309-MD fuses use the aR utilization category and combine compact construction, low I²t characteristics, high breaking capacity, and resistance to current surges, mechanical vibration, impact, and wide temperature variation.
Key Specifications
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Manufacturer: SINOFUSE
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Series: RS309-MD
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Product Type: Cylindrical bolt-connected high-speed fuse
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Rated Voltage: AC/DC 500V
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Rated Current Range: 35A to 1200A
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Utilization Category: aR
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AC Breaking Capacity: 200kA
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DC Breaking Capacity: 50kA
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DC Time Constant: ≤15ms
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Performance Standards: UL 248 and IEC 60269
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Application Reliability References: ISO 8820 and GB/T 31465
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Compliance: CE and RoHS
Typical Applications
- Electric vehicle drive power systems
- Power conversion systems
- Battery energy storage and power systems
- Variable frequency controllers
- Charging equipment
- Automotive electrical systems
- Industrial power electronics
- Short-circuit protection
- Overload protection
- Backup protection
RS309-MD Current Range
The RS309-MD family includes 27 rated-current options from 35A to 1200A across multiple mechanical sizes for different current levels and installation requirements.
Available ratings include 35A, 40A, 45A, 50A, 60A, 70A, 80A, 90A, 100A, 125A, 150A, 175A, 200A, 225A, 250A, 275A, 300A, 325A, 350A, 400A, 450A, 500A, 600A, 700A, 800A, 1000A and 1200A.
Certification Note
The manufacturer specifies CE certification across the series and RoHS compliance. UL certification applies to the relevant RS309-MD models below 700A. Models rated from 700A through 1200A are specified as not UL certified.
RS309-MD Technical Guide
For detailed model information, mechanical size groups, mounting requirements, operating conditions, certification details, and application guidance, visit the RS309-MD Series technical page:
SINOFUSE RS309-MD Series AC/DC 500V High-Speed Bolt-Connected Fuse Technical Guide
Explore More SINOFUSE Fuse Solutions
For additional SINOFUSE EV, high-speed, semiconductor, and DC fuse series, visit:
SINOFUSE Fuse Solutions – Brand & Technical Overview
Industrial Sourcing Support
Apexon Supply supports industrial buyers with SINOFUSE product identification, specification review, model selection, technical cross-reference, and international sourcing coordination. For RS309-MD availability or quotation requests, please provide the required model, rated current, quantity, and available application information.
