Square D QO120AFI 20A 1P 120V Circuit Breaker, QO, AFCI, Plug-On | AmpState

Square D QO120AFI is a 20-amp, 1-pole, 120-volt AFCI plug-on circuit breaker engineered for reliable protection in panelboards, load centers, and distributed electrical systems. Designed for replacement projects and spare stocking, it helps keep your bill of materials aligned to the original part number while delivering advanced arc-fault protection.

Why this AFCI breaker stands out

• AFCI protection on a 120V circuit helps detect and interrupt dangerous arc faults, reducing the risk of electrical fires in living spaces, bedrooms, home offices, and other critical areas.
• Plug-on installation—quick, tool-free replacement in compatible Square D QO panels. This means less downtime and fewer wiring complexities when upgrading from standard breakers to AFCI protection.
• Single-pole, 20A rating provides dependable protection for standard branch circuits, balancing performance and compatibility with common home and small business loads.
• QO family compatibility tailored for Square D QO panelboards and distribution equipment, ensuring a seamless fit with your existing electrical infrastructure.
• Stocking-friendly part—the QO120AFI is ideal for replacements and spares to maintain BOM integrity and streamlined maintenance schedules.

What problems does it solve?

• Prevents nuisance arc-fault events from going unnoticed, enhancing safety in hard-to-access circuits.
• Addresses modern code expectations for arc-fault protection on 120V branch circuits in living spaces and other conditioned areas.
• Provides a straightforward upgrade path from non-AFCI breakers in compatible panels, reducing the time and effort required for compliance updates.
• Offers a dependable, brand-consistent option to maintain performance and reliability across your electrical distribution system.

Ideal for

Homeowners, electricians, and facilities managers who need a reliable, code-aligned AFCI solution within Square D’s QO line. It’s especially suitable for replacement projects, maintenance stocking, and ensuring BOM alignment with the original part number.

Specifications at a glance

• Brand: Square D
• Part number: QO120AFI
• Type: Circuit Breaker, AFCI
• Amperage: 20 A
• Poles: 1
• Voltage: 120 V
• Mounting: Plug-On (QO family)

Need help confirming fit or compatibility with your panel? Our team is ready to assist—send us a message and we’ll help verify that the QO120AFI is the right match for your exact electrical setup.