Square D QO120CAFI 20A 1P 120V Circuit Breaker, QO, AFCI, Combination AFCI | AmpState

The Square D QO120CAFI is a purpose-built arc-fault circuit interrupter designed for robust protection in residential electrical systems. As a 1-pole, 20-amp, 120-volt AFCI breaker, it protects circuits in panelboards, load centers, and electrical distribution setups while preserving a consistent part number for retrofit projects and ongoing maintenance.

Key features that matter in real-world installations:

• Type and compatibility: QO family AFCI (Combination AFCI) designed for Square D panelboards and load centers, ensuring reliable fitment within existing QO setups.
• Electrical specs: 20 A, 1-pole, 120 V — a common configuration for living spaces and branch circuits requiring arc-fault protection.
• Retrofit-friendly: Keeps part-number consistency for easier replacements and maintenance planning, minimizing downtime during upgrades or service work.
• Availability: Offered through AmpState, making it accessible for order-and-ship needs or replacement programs.

Why this AFCI breaker matters

Arc-fault protection helps mitigate fire hazards by detecting dangerous arcing conditions and disconnecting the circuit before damage occurs. The QO120CAFI combines reliable circuit interruption with the convenience of a single-pole AFCI unit, making it a practical upgrade for spaces where electrical safety and code compliance are priorities.

Ideal use cases

• Upgrading aging circuits in existing panelboards and load centers to meet modern AFCI requirements.
• Retrofit projects where maintaining the same part number simplifies inventory and maintenance schedules.
• Residential electrical distribution where compact, reliable arc-fault protection is needed on standard 120V circuits.

Need help matching a part number or confirming compatibility with your panel? Message us and we’ll help you verify fit before you buy.