Square D QOB345 - 45A, 3-Pole, Circuit Breaker

Meet the Square D QOB345 45A 3-pole circuit breaker — a dependable overcurrent protection device built to safeguard three-phase power systems in demanding environments. Crafted for use in panelboards, switchboards, and control panels, this breaker delivers consistent, reliable performance where reliability matters most.

• 45 A, three-pole design provides balanced protection for three-phase feeders, simplifying wiring and fault isolation in multi-phase installations.
• Flexible integration designed to work seamlessly in panelboards, switchboards, and control panels—ideal for industrial, commercial, and OEM applications.
• Robust protection delivers dependable overcurrent protection and promotes safe operation across distribution panels and motor control centers.
• Proven reliability engineered to withstand the demands of everyday electrical environments, helping to minimize downtime and extend equipment life.

Ideal use cases

• New or retrofit installations in three-phase systems needing reliable protection for motors, feeders, and three-phase loads.
• Panel upgrades in manufacturing facilities, processing lines, HVAC distributions, or automated equipment where a familiar, compatible protection device is essential.
• OEM assemblies requiring a trusted, easily integrated circuit breaker that aligns with Square D distribution components.

Why choose the QOB345 in your electrical system

• Part of the Square D lineage with compatibility across Square D panels and accessories, simplifying maintenance and replacements.
• Three-phase suitability specifically designed to protect multi-phase circuits without complicating installation or coordination.
• Clear protection outcomes by interrupting fault currents promptly, reducing the risk of equipment damage and safeguarding personnel.

Technical snapshot
Current rating: 45 A • Poles: 3 • Breaker type: Circuit Breaker

Whether you’re upgrading an existing distribution panel, configuring a new control panel for an automation line, or equipping a motor control center, the Square D QOB345 delivers the reliable protection your system requires. Built for durability in industrial and commercial settings, it’s a practical, trusted choice for professionals who value safety, stability, and seamless integration.