Overview
The Bussmann FWP-90B is an Eaton high-speed cylindrical fuse designed for protection of semiconductor circuits, AC and DC drives, power converters, rectifiers, and variable-speed drives. Rated at 90 amps with dual 700VAC/VDC voltage rating, this fast-acting cartridge fuse delivers reliable circuit protection in industrial and commercial control systems.
Key Features
- High-speed (fast-acting) GR-class fuse with excellent DC and cycling performance
- Dual-rated 700VAC and 700VDC voltage capability for flexible deployment
- 200 kAIC interrupt rating at 700VAC, 50 kAIC at 700VDC
- Cartridge design with blade-end / stud-mount terminals for secure connection
- UL-listed semiconductor and general-purpose protection
Technical Specifications
- Current Rating: 90 amperes
- Voltage Rating: 700VAC / 700VDC
- Interrupt Rating: 200 kAIC at 700VAC; 50 kAIC at 700VDC
- Operating Class: GR (Fast-Acting)
- Construction: High-speed cylindrical cartridge
- Terminal Type: Blade end × blade end, stud mount
- Weight: 0.12 kg (approximately)
- Approvals: UL listed
Typical Applications
- Semiconductor and power rectifier protection
- DC common bus and DC drive systems
- AC and variable-frequency drive (VFD) motor control circuits
- Power converter and industrial solid-state control circuits
- UPS systems and backup power protection
- Panel-level and equipment-level circuit protection in industrial facilities
Compatibility & Replacements
Compatible With
- Industrial control panels and motor control centers
- VFD input bus fuse blocks (0–100A stud-mount rated)
- Power converter and rectifier input circuits
- DC link and energy storage systems
- Any circuit requiring fast-acting semiconductor protection at 90A, 700V service
Replaces / Drop-In Replacement For
- FWP-90A (older/alternate designation)
- Cooper Bussmann FWP-90B (original Cooper designation before Eaton acquisition)
- FWP series equivalent cartridge fuses in 90A, 700V, GR-class rating
Works With
- Bussmann high-temperature thermoplastic fuse blocks (0–100A, 5/16″–18 TPI stud)
- Standard cartridge fuse clips and ferrule-style mounting hardware
- Any control system requiring UL-listed fast-acting semiconductor fuse protection
