Overview
The Eaton Bussmann FWH-200B is a high-speed cylindrical fuse engineered for critical DC power distribution and semiconductor circuit protection. Rated at 200A with dual 500V AC/DC capability, this fuse delivers fast-acting Class aR protection for power converters, DC drives, rectifiers, and reduced-voltage motor starters in industrial automation and control systems.
Key Features
- High-speed (fast-acting) response for semiconductor and power electronic protection
- Dual voltage rating: 500V AC and 500V DC operation
- Class aR time-delay characteristics with excellent DC performance
- 200 kAIC (kiloampere interrupting capacity) at rated voltage
- Blade end (bolt) stud terminal configuration for secure mounting
- Ceramic construction with white finish
- UL 248-13, CSA certified, and CE marked
- RoHS compliant and REACH registered
Technical Specifications
- Current Rating: 200A
- Voltage Rating: 500V AC / 500V DC
- Breaking Capacity (AC): 200 kA
- Breaking Capacity (DC): 50 kA at 300V DC
- Fuse Class: aR (semiconductor-rated, time-delay)
- Type: High-speed cylindrical cartridge
- Dimensions: 29 × 92 mm (1.156" Dia × 3.63" L)
- Weight: 152 grams
- Terminal Style: Blade end (center-bolted studs)
- Melting I²t: 1900
- Construction: Ceramic body
- Approvals: UL, CSA, CE
- Series: FWH
Typical Applications
- DC common bus protection in power distribution systems
- DC drive and variable frequency drive (VFD) circuit protection
- Power converter and rectifier output protection
- Reduced-voltage motor starters
- Industrial control panel DC circuits
- UPS and energy storage system DC circuits
- Semiconductor-level circuit protection
Compatibility & Replacements
Compatible With
- Eaton Bussmann BH fuse holders (modular mounting blocks)
- Any standard 200A/500V cylindrical fuse cavity
- DC drives and power electronics from major manufacturers (ABB, Siemens, Danfoss, etc.)
- Industrial control systems using 500V DC common bus architecture
Replaces / Drop-In Replacement For
- Bussmann FWH-200 (equivalent without designator suffix)
- Other Class aR 200A/500V high-speed fuses meeting UL 248-13
Works With
- Eaton fuse blocks and holders (BH series, modular 0-400A platforms)
- Any compliant fuse cavity rated 200A/500V or higher
- Standard industrial cabinet wiring per IEC/NEC standards
