Square D QO350 50A 3P 240V Circuit Breaker, QO, Plug-On | AmpState

Meet the Square D QO350 — a dependable 50A, 3-pole, 240V circuit breaker designed for everyday electrical protection in panelboards, load centers, and distribution panels. Built for fast, reliable service, this QO plug-on breaker is ready to snap into the Square D QO family, delivering a straightforward replacement or upgrade path that minimizes downtime on maintenance days.

• Direct part-number match: Precisely engineered for Square D QO panels, ensuring compatibility when you stock spare parts and reduce guesswork on compatibility checks.
• Plug-on installation: Quick, tool-free mounting onto the bus stabs — ideal for field servicing and rapid panel reconfigurations.
• 3-pole, 240V configuration: Suited for three-phase systems and multi-wire circuits common in commercial and light industrial environments.
• 50 Amp rating: Provides robust protection for feeders and branch circuits without unnecessary downtime from nuisance trips.
• Trusted brand, reliable sourcing: From Square D, with AmpState availability to simplify procurement when planning panel builds or replacements.

This QO350 is specifically tailored for use in panelboards, load centers, and electrical distribution setups where a direct part-number match matters. For maintenance teams, panel builders, and facilities managers, carrying a standard 50A 3P 240V QO plug-on breaker means quicker responses to trips, easier panel expansions, and consistent protection across your electrical system.

Specs at a glance

• Manufacturer: Square D
• Part Number: QO350
• Product Type: Circuit Breaker
• Amperage: 50 A
• Poles: 3
• Voltage: 240V
• Mounting: Plug-On (QO series)

Need help matching a part number or confirming compatibility with your panel? Message us and we’ll help you verify fit, order confidently, and ensure your electrical distribution remains protected and compliant.

Keep your electrical system running smoothly with the Square D QO350—a practical, ready-to-use solution for maintenance, installation, and spare inventory needs.