Bussmann FWJ-400A High Speed Fuse

Bussmann FWJ-400A High Speed Fuse

Precision Protection for Critical Circuits

Overview

The Bussmann FWJ-400A High Speed Fuse delivers ultra-rapid circuit protection for sensitive electronics and high-performance industrial systems. Engineered for 400A applications, this fuse interrupts fault currents within milliseconds to safeguard semiconductors, motor drives, and power converters from catastrophic damage. Ideal for demanding environments where downtime is not an option.

Key Features

• Ultra-Fast Response: Clears faults in under 1/2 cycle (≤8ms), minimizing energy let-through to protect delicate components.
• High Current Rating: Robust 400A capacity for heavy-duty industrial, renewable energy, and UPS systems.
• Low I²t Value: Reduces thermal stress on protected equipment by limiting heat buildup during faults.
• Voltage Compatibility: Rated for up to 700V AC/DC applications (verify specific voltage class for your use case).
• Interrupting Capacity: Exceptional short-circuit interruption (up to 200kA) ensures reliable performance in high-fault scenarios.
• Durable Construction: Ceramic body with precision-notched silver element, filled with quartz sand for arc suppression.

Applications

• Semiconductor protection (SCRs, IGBTs, diodes)
• Industrial motor drives & VFDs
• Solar inverters and battery storage systems
• Mining equipment & heavy machinery
• Data center power distribution

Why Choose Bussmann?

• Proven Reliability: Industry-leading quality and consistency backed by Eaton’s engineering legacy.
• Certified Safety: Complies with UL/CSA/IRAM standards.
• Space-Efficient: Compact design optimizes panel space without sacrificing performance.

Ensure system integrity—install Bussmann FWJ fuses for uncompromising protection against transient overloads and short circuits.

Note: Confirm voltage rating and mounting style for specific compatibility with your equipment.