Square D QO340GFI 40A 3P 240V Circuit Breaker, QO, GFCI, Plug-On | AmpState

The Square D QO340GFI is a purpose-built GFCI circuit breaker designed for reliable protection in panelboards, load centers, and electrical distribution systems. With 40 amps, 3 poles, and a 240-volt rating, this plug-on breaker delivers robust, ground-fault protection exactly where you need it—right at the source.

• Exact part-number match: QO340GFI ensures seamless drop-in compatibility with Square D QO-style panels, minimizing fit issues during replacements or panel builds.
• GFCI protection at the breaker: Integrates ground-fault protection into the circuit, helping to reduce shock risk on 240V, 3-pole feeders and sensitive equipment installations.
• Plug-On installation: Quick, tool-free mounting to the panel bus for faster commissioning and simpler maintenance wiring changes.
• 40 A, 3-pole, 240V: Ideal for higher-load, multi-wire circuits and 3-phase applications where dependable protection is essential.
• Trusted brand and support: From Square D, backed by AmpState’s availability and ready-to-ship inventory, with expert help to confirm fit when you’re building or stocking parts.

Where it shines

Use the QO340GFI in panelboards and load centers that require integrated GFCI protection for 240V circuits. It’s particularly advantageous in electrical distributions serving workshops, commercial spaces, or equipment rooms where damp or moisture exposure increases shock risk. The 3-pole configuration provides solid protection across all three conductors in a 240V system, helping you meet safety requirements without adding separate GFCI outlets downstream.

Why choose this Square D GFCI breaker

• Direct fit for QO panels minimizes compatibility questions during repair or construction projects.
• Comprehensive protection places fault protection at the feeder level, simplifying wiring layouts and inspection readiness.
• Reliable stock for professionals—a practical choice for maintenance teams and panel builders who value quick, accurate part-number matching.

If you’re building, stocking, or servicing electrical systems that rely on fast, accurate part matching and dependable GFCI protection, the Square D QO340GFI 40A 3P 240V Circuit Breaker is a smart, future-proof choice. AmpState is ready to help confirm fit and ensure you have the right part on hand when you need it.