Fuji Electric BU-KSA3400 - 400A, 480VAC, Circuit Breaker

The Fuji Electric BU-KSA3400 is a high-capacity circuit breaker designed to deliver reliable overcurrent protection in demanding electrical environments. With a 400A rating at up to 480VAC, this device is purpose-built for industrial power distribution where safety, uptime, and precise protection matter most. Ideal for panelboards, switchboards, control panels, and OEM equipment, it integrates smoothly into existing systems while providing dependable fault isolation when it’s needed most.

• High current capability: 400A rating handles substantial load demands in motors, drives, and other heavy equipment without compromising protection.
• Industrial voltage compatibility: 480VAC operation aligns with common commercial and industrial power distribution standards, simplifying integration into your electrical infrastructure.
• Versatile installation footprint: Suitable for use in panelboards, switchboards, control panels, and OEM assemblies, making it a flexible choice for new builds or upgrades.
• Robust overcurrent protection: Provides prompt interruption to prevent damage to wiring, components, and downstream equipment, reducing downtime and maintenance costs.
• Reliable performance for critical environments: Built to withstand the rigors of industrial and commercial settings where consistent operation matters.

Use cases and scenarios where the BU-KSA3400 shines include motor control centers in manufacturing lines, distribution panels across commercial facilities, and OEM projects where a sturdy, stackable protection solution is required. If you’re upgrading an existing 480VAC distribution panel or designing a new control system with clear overload protection, this Fuji Electric breaker offers a proven path to safer, more reliable electrical operation.

• Who this is for: Electrical engineers, maintenance teams, OEM manufacturers, and facilities managers seeking dependable, high-capacity overcurrent protection.
• What problems it solves: Prevents insulation damage and equipment failure from overloads, reduces unplanned outages, and simplifies upstream protection coordination in 480VAC systems.
• How it compares to alternatives: Combines a robust 400A rating with 480VAC compatibility in a compact, panel-ready form factor, offering a reliable balance of protection and ease of integration for 480V distributions.
• Practical tips: Confirm your panel or switchboard is rated for 480VAC and supports a 400A protection device; verify available space and mounting alignment; plan for proper conductor sizing and upstream protection coordination to maximize safety and uptime.

Technical snapshot

• Current rating: 400A
• Voltage rating: 480VAC
• Breaker type: Circuit Breaker

With the Fuji Electric BU-KSA3400, you’re choosing a dependable, purpose-built solution for heavy-duty electrical protection. It’s a smart, future-ready component for distribution panels, motor control centers, and OEM equipment where performance and safety aren’t negotiable.