Siemens QA120AFCNCSA - 20 A, 120 V, 1-Pole Plug-In Circuit Breaker | AmpState

Meet the Siemens QA120AFCNCSA—a rugged 20A, 120V, 1-pole plug-in circuit breaker crafted to shield your electrical system from overcurrent and short-circuit events. Built for dependable performance in panelboards and loadcenters, this molded case breaker helps you protect residential, commercial, and light industrial circuits with confidence.

• Fast plug-in connection: Simplifies installation and quick replacements, reducing downtime during panel maintenance or upgrades.
• Thermal-magnetic trip unit: Delivers stable, repeatable protection by responding to both sustained overloads and instantaneous short circuits, while minimizing nuisance trips.
• OEM-compatible design: Specifically engineered to fit Siemens load centers and panelboards, ensuring reliable electrical contact and seamless integration.
• Versatile protection: Ideal for a wide range of applications—home wiring, small businesses, and light industrial circuits that require solid 20A protection at 120V.

Technical specifications

• Manufacturer: Siemens
• Part number: QA120AFCNCSA
• Type: Thermal-magnetic molded case circuit breaker
• Amperage rating: 20A
• Voltage rating: 120V
• Number of poles: 1
• Mounting style: Plug-in
• Application: Branch circuit overcurrent and short-circuit protection

Use cases and who benefits

• Homeowners upgrading or repairing a Siemens-compatible panelboard, replacing a failed or tripped breaker quickly and safely.
• Electrical contractors wiring kitchens, laundry rooms, or other high-demand circuits that require reliable 20A protection at 120V.
• Small commercial setups and light industrial installations where fast plug-in installation minimizes downtime during panel servicing.

Why this breaker stands out

Beyond basic specs, the QA120AFCNCSA delivers practical benefits you’ll notice in everyday projects: a plug-in design that reduces installation complexity, a trip system tuned for consistent performance under varying loads, and seamless compatibility with Siemens OEM panelboards so you don’t have to chase mismatched components. This is protection that translates to safer, more reliable electrical systems with fewer interruptions.

Practical installation tips

For best results, pair this breaker with a compatible Siemens panelboard, ensure the circuit load aligns with the 20A rating, and verify the slot is clean and free of debris before seating the breaker. When wiring, follow all manufacturer and local electrical codes, secure connections fully, and gently snap the unit into a properly aligned bus bar for a secure, reliable connection.