Bussmann FWJ-350A High Speed Fuse

Precision Protection for Demanding Electronic Circuits

Overview

The Bussmann FWJ-350A High Speed Fuse is engineered to provide ultra-rapid overcurrent protection in high-energy DC and AC systems. Designed for critical applications requiring minimal let-through energy, this fuse safeguards sensitive semiconductors, rectifiers, and power electronics from damaging short-circuit events. Ideal for industrial automation, renewable energy systems, and transportation infrastructure.

Key Features

• Ultra-Fast Response: Clears faults in milliseconds (≤1 ms under rated conditions) to prevent equipment damage.
• High Breaking Capacity: 200 kA interruption rating at 700V DC/500V AC ensures reliable protection in high-power circuits.
• Low I²t Value: Minimizes thermal stress on protected components, extending system lifespan.
• Compact Cylindrical Design: Space-saving 10.3mm x 38mm form factor (10x38mm) with bolted end caps for secure connections.
• Robust Construction: Ceramic body with sand-filled arc quenching for stable performance in harsh environments (-55°C to +125°C).

Technical Specifications

Applications

• Solar inverters and wind turbine converters
• EV charging stations and battery management systems
• Industrial motor drives and UPS systems
• Railway traction and mining equipment
• Power supply units and capacitor banks

Why Choose FWJ-350A?

Bussmann’s proprietary fuse technology ensures zero nuisance tripping during inrush currents while delivering deterministic protection against catastrophic faults. Backed by Eaton’s global support network, this fuse combines cutting-edge safety with industrial durability—reducing downtime and repair costs in mission-critical installations.

Engineered for reliability. Trusted worldwide.

*Note: Specifications subject to change; refer to official datasheets for design validation.*