Overview
The Bussmann FWP-400A is a high-speed fuse cartridge rated at 400A and 700V AC/DC, designed for semiconductor protection and general industrial applications. This Class gR full-range fuse delivers superior current limitation and cycling performance, making it ideal for demanding electrical systems requiring fast response times and reliable protection against overloads and short circuits.
Key Features
- High-speed response with full-range protection for both overload and short-circuit conditions
- Ferrule-style blade terminal design for stud-mount installation
- 400A RMS rating at 700V AC/DC for heavy-duty applications
- Class gR classification: dedicated semiconductor fuse with full-range characteristics
- 200 kAIC breaking capacity at rated voltage; 50 kAIC at 700 VDC
- Non-indicating design for reliable operation in temperature-sensitive environments
Technical Specifications
- Current Rating: 400A RMS
- Voltage Rating: 700V AC / 700V DC
- Fuse Type: Cartridge, Ferrule Style
- Class: gR (Semiconductor Fuse, Full Range)
- Response Time: Fast-Acting
- Breaking Capacity (200 kA @ 700V AC): 200,000 Amperes
- Breaking Capacity (@ 700V DC): 50 kAIC
- Mounting: Bolt-Mount (Blade End x Blade End)
- Dimensions: Approximately 2.0″ Diameter x 5.1″ Length (50.8 x 129.54 mm)
- Weight: 1.02 lbs
- Fuse Indicator: Non-Indicating
- Manufacturer: Eaton (Bussmann Division)
- UL Listed: Yes
- RoHS Compliant: Yes
Typical Applications
The FWP-400A is suited for:
- Semiconductor protection in industrial power systems
- DC circuit protection in renewable energy installations (solar, wind)
- Heavy industrial equipment requiring 400A+ protection
- UPS systems and high-capacity distribution networks
- Industrial automation and process control systems
- Motor control circuits in HVAC and manufacturing plants
Compatibility & Replacements
Compatible With
- Stud-mount fuse holders rated for 400A 700V cartridge fuses
- Industrial switchgear and distribution panels with ferrule-mount cartridge slots
- Motor control centers (MCCs) and power distribution equipment
- Any system requiring Class gR semiconductor fuse protection
Replaces / Drop-In Replacement For
Verify compatibility with your system integrator before ordering. The FWP-400A is the standard Bussmann model in this rating category; older equivalent models may exist from legacy Cooper Bussmann inventory.
Works With
- Eaton/Bussmann fuse holder series rated for FWP fuses
- Industrial power systems using ferrule-style cartridge fuses
- IEC and UL-listed electrical equipment and distribution cabinets
- Standard bolt-mount configurations (blade-to-blade terminal)
