Fuji Electric BU-KSB3300 - 300A, 3-Pole, Circuit Breaker

Meet the Fuji Electric BU-KSB3300 — a rugged 300A, 3-Pole circuit breaker engineered for demanding electrical installations. Designed to deliver dependable overcurrent protection in distribution panels and motor control centers, this unit keeps critical machinery safe while minimizing downtime.

• Current rating: 300 A
• Poles: 3-Pole (three-phase protection)
• Breaker type: Circuit Breaker
• Applications: panelboards, switchboards, control panels, and motor control centers
• Best for: industrial, commercial, and OEM environments where robust protection matters

The BU-KSB3300 is built to handle the rigors of continuous operation in high-demand settings. In manufacturing lines, this three-phase device protects motors, drives, and feeders from overloads and short circuits, helping to prevent costly equipment damage and unplanned outages. With a compact footprint suitable for dense panel layouts, it simplifies wiring and panel design without compromising performance.

Key benefits and use cases

• Three-phase protection: Ideal for 3‑phase motors and 3‑phase feeders in MCCs and switchgear.
• Reliable overcurrent protection: Rapidly detects overloads and faults to isolate affected circuits.
• OEM-friendly: Ready for integration into customized electrical assemblies and equipment.
• Versatile installation: Suitable for panelboards, switchboards, and control panels across industrial facilities and commercial buildings.

Why choose Fuji Electric BU-KSB3300?

Fuji Electric brings decades of experience in protective devices, combining solid electrical performance with dependable build quality. The BU-KSB3300 300A 3‑pole breaker is a practical choice when you need scalable, reliable protection for a three‑phase distribution network or motor control center. It pairs well with Fuji Electric switchgear and panels and offers predictable, safe operation even under challenging load conditions.

Practical tips for selection and maintenance

• Match the rating to your load: Use 300 A for large motors and feeders within three-phase distribution systems.
• Check compatibility: Ensure the unit fits your panelboard or MCC enclosure and aligns with your bus ratings.
• Secure mounting and torque: Follow manufacturer torque specs to maintain reliable conductors and trip performance.
• Inspect regularly: Periodically check for signs of overheating, corrosion, or wear in the terminal connections.