Siemens BA120AFCH - 20 A, 120 V, 1-Pole Bolt-On Circuit Breaker | AmpState

Siemens BA120AFCH delivers reliable branch-circuit protection for residential, commercial, and light industrial panels. This 20A, 120V, 1-pole bolt-on molded-case circuit breaker is built to retrofit, upgrade, or install in Siemens-compatible panelboards and load centers, providing robust protection against overcurrent and short-circuit conditions where it matters most.

Key features that set this breaker apart

• Secure bolt-on mounting for a rigid, vibration-resistant bus connection that stays reliably in place even in busy electrical environments.
• Thermal-magnetic trip unit delivers stable, repeatable protection performance by combining time-delay and instantaneous trip characteristics tailored to typical branch circuits.
• OEM compatibility designed to pair seamlessly with matching Siemens load centers and panelboards, simplifying replacements and upgrades.
• Versatile application suitable for a wide range of settings—from homes and small businesses to light industrial installations—where dependable 20-amp protection at 120 volts is needed.

Technical specifications at a glance

• Manufacturer: Siemens
• Part Number: BA120AFCH
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 20A
• Voltage Rating: 120V
• Number of Poles: 1
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Use cases and real-world benefits

If you’re wiring a new panel or upgrading an existing one, the BA120AFCH is a practical choice for reliable, code-compliant protection on general lighting and receptacle circuits. Its bolt-on design provides a sturdy connection in environments with vibration or movement, reducing the risk of loose connections over time. The thermal-magnetic trip mechanism helps prevent nuisance trips on normal surges while quickly interrupting fault current to minimize damage to wiring and connected devices.

Who benefits most:

• Homeowners performing panel upgrades or replacements in Siemens-compatible systems
• Electrical contractors installing or expanding light commercial spaces
• Maintenance teams maintaining small industrial facilities with standard 120V branch circuits

Compared to non-bolt-on or non-molded-case options, this breaker offers a more secure mechanical attachment, predictable trip behavior, and straightforward compatibility with OEM panelboards—leading to faster installations and long-term reliability.

Whether you’re protecting a dedicated lighting circuit, an outlet cluster, or a critical small-appliance run, the Siemens BA120AFCH delivers precise protection, easy integration, and enduring performance in a compact, 1-pole package.