Square D QO3401021 40A 3P Circuit Breaker, QO, Plug-On | AmpState

Meet the Square D QO3401021—a dependable 40A, 3-pole circuit breaker built for robust protection in panelboards, load centers, and electrical distribution networks. With the proven QO Plug-On design, this unit is designed for straightforward installation and reliable performance in demanding environments.

Key benefits that matter in the field

• Precise protection for 3‑phase circuits: 40 A, 3 poles to safeguard critical loads in commercial and industrial panel layouts.
• QO Plug-On reliability: Quick, secure connection to the bus system for efficient installation and maintenance.
• BOM-conscious replacement: Ideal for replacement projects and stocking spares that keep your bill of materials aligned with the original part number.
• Brand-backed performance: Trusted Square D engineering designed to integrate seamlessly with existing QO families and electrical distribution gear.
• Avaliable through AmpState: Ready to ship from AmpState to meet your project timelines.

Where and how you’ll use it

• Panelboards and load centers in commercial buildings, warehouses, and light industrial facilities.
• Electrical distribution setups where a 3-pole 40A protection device is required for balanced, three‑phase circuits.
• Replacement scenarios where you need to match an original part number to avoid BOM discrepancies.

Specifications at a glance

• Manufacturer: Square D
• Part number: QO3401021
• Product type: Circuit Breaker
• Amperage: 40 A
• Poles: 3
• Configuration: QO Plug-On

How we help you confirm fit

Not sure if this is the exact match for your panel or BOM? We can help. Message us to verify compatibility and ensure your replacement part will drop in without issue, keeping your electrical system compliant and running smoothly.

Choose the Square D QO3401021 for dependable protection, streamlined installation, and BOM compatibility—backed by AmpState’s availability to keep your project on schedule.