Siemens BA120AFC - 20 A, 120 V, 1-Pole Bolt-On Circuit Breaker | AmpState

The Siemens BA120AFC is a dependable 20A, 120V, 1-pole bolt-on molded case circuit breaker designed to safeguard your electrical panelboards and load centers. Built for branch circuit overcurrent and short-circuit protection, this breaker delivers reliable performance where it matters most—inside homes, small businesses, and light industrial environments.

Why the BA120AFC stands out

• Secure bolt-on mounting for a rigid, vibration-resistant bus connection that stays seated through temperature changes and routine service.
• Thermal-magnetic trip unit provides stable, repeatable protection across a range of loads, helping to prevent nuisance trips while still guarding against faults.
• OEM compatibility is designed to work with matching Siemens load centers and panelboards, making upgrades or replacements straightforward and reliable.
• Versatile for multiple sectors suitable for residential, commercial, and light industrial applications where dependable protection is essential.

Key specifications at a glance

• Manufacturer: Siemens
• Part Number: BA120AFC
• 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

Ideal use cases and practical applications

When upgrading or expanding an electrical system, the BA120AFC serves as a reliable bolt-on solution for panelboards and load centers that require robust branch-circuit protection. It’s an excellent match for:

• Residential subpanels undergoing panel upgrades or rewiring projects
• Commercial spaces with defined circuit zones, lighting, and receptacle groups
• Light industrial setups with smaller machinery or equipment on dedicated branches

What to expect in real-world performance

With its thermal-magnetic trip mechanism, this breaker responds quickly to faults while maintaining consistent protection under varying loads. The bolt-on design ensures a secure, vibration-resistant connection to the bus, reducing the chance of loose contacts in environments with temperature fluctuations or vibration. By choosing a Siemens BA120AFC, you’re aligning with a proven, OEM-compatible solution that integrates smoothly with existing Siemens panelboards and load centers.

Whether you’re a professional electrician, facility manager, or a DIY enthusiast upgrading a residential panel, the BA120AFC delivers precise protection, straightforward installation, and dependable performance for years to come.