Square D QO340SWN 40A 3-Pole 240 V Circuit Breaker Potential Transformer

Meet the Square D QO340SWN — a purpose-built solution for reliable 3‑phase protection in 240 V systems. This 40 A, 3‑pole circuit breaker is tailor-made for commercial and light‑industrial panels, delivering precise current interruption when your electrical loads demand it most.

Why choose the Square D QO340SWN?

• Clear 3‑pole protection supports three‑phase circuits, helping ensure balanced protection across all legs of your system.
• 40 amp capacity provides robust protection for motor starters, HVAC equipment, and other controlled loads without unnecessary nuisance tripping.
• 240 V operation aligns with common commercial electrical distributions, making it a straightforward match for standard panels.
• Direct compatibility with Square D QO family panels helps streamline installation, replacement, and panel maintenance.
• Durable, field‑reliable design built to endure the demands of busy electrical environments while delivering consistent protection year after year.

Ideal use cases

• Three‑phase motor loads in manufacturing, conveyors, or processing equipment
• HVAC and climate control circuits in commercial spaces
• Branch circuits distributing power to three‑phase lighting or equipment
• Panel maintenance and upgrade projects where a like‑for‑like replacement is desired

Specifications at a glance

• Part number: QO340SWN
• Current rating: 40 A
• Poles: 3
• Voltage rating: 240 V
• Configuration: 3‑pole circuit breaker for 240 V systems

Designed for technicians who value dependable protection and straightforward compatibility, the Square D QO340SWN is a reliable choice when upgrading or stocking spare breakers for 3‑phase panels. Whether you’re equipping a new installation or replacing a worn unit, this breaker delivers predictable performance, easy serviceability, and peace of mind for your electrical distribution — all in a compact, industry‑standard package.