Siemens QA120AFCNL 120A 1-Pole 120 V Circuit Breaker

Siemens QA120AFCNL 120A 1-Pole 120 V Circuit Breaker is the trusted safeguard for your 120-volt electrical circuits. With a 120 A rating and a single-pole design, this Siemens part provides reliable interruption to protect wiring and connected devices from overloads and faults in residential or light commercial panels.

Key specifications

• Current rating: 120 A
• Poles: 1
• Voltage rating: 120 V
• Part number: QA120AFCNL
• Brand: Siemens
• Type: 1-pole circuit breaker

Why this Siemens QA120AFCNL stands out

• Dedicated 120 V, single-pole protection: Perfect for protecting individual 120-volt circuits such as lighting, receptacle runs, or dedicated appliances, while fitting into standard Siemens panels that accept QA-series breakers.
• Clear, documented part compatibility: Designed as part of the QA family, ensuring consistent performance and straightforward replacement within compatible Siemens panel systems.
• Reliable interruption for safety: When overloads occur, this breaker rapidly interrupts current to minimize wiring damage and reduce risk to your electrical system.

Ideal use cases

• Upgrading or replacing a worn or faulty 120 V, single-pole breaker in a residential electrical panel.
• Protecting a specific branch circuit dedicated to lighting, outlets, or a single high-draw appliance within a home or small business.
• Installing consistent, Siemens-branded protection in panels designed to accept QA-series breakers, ensuring cohesive performance and labeling.

Installation and practical tips

• Turn off the main power and verify the panel is compatible with QA-series breakers before installation.
• Follow the panel manufacturer’s instructions for securing the breaker connections and any torque specifications for mounting.
• Use this 120 A, 1-pole breaker for a single hot leg on 120 V circuits to ensure proper protection and fault interruption.
• Consider labeling the protected circuit clearly on the panel to simplify future maintenance and safety checks.

Whether you’re completing a panel refresh, replacing a failing component, or standardizing your protection with a Siemens-based solution, the QA120AFCNL delivers dependable, 120 V circuit protection with a straightforward, single-pole design. Align your installation with your existing Siemens infrastructure and enjoy consistent performance, clear identification, and peace of mind for everyday electrical demands.