Siemens B120DF 20A 1P 120V Circuit Breaker, AFCI, GFCI, Dual-Function, Bolt-On | AmpState

The Siemens B120DF is a 20A, 1-pole circuit breaker that combines AFCI (arc-fault) and GFCI (ground-fault) protection in a single, bolt-on unit. Designed for panelboards and load centers, this dual-function breaker is ideal for retrofit projects where you want modern safety features without altering your existing part numbers.

• Dual-function protection — AFCI and GFCI come together in one compact device, reducing device count and simplifying wiring while delivering comprehensive circuit safety.
• 1-pole, 120V, 20A — a common configuration for residential branch circuits, appliance circuits, and lighting runs that require both arc-fault and ground-fault protection.
• Bolt-on installation — engineered for quick swaps in compatible Siemens panelboards and load centers, making retrofits faster and easier for maintenance planning.
• Code-aligned performance — supports protection requirements where AFCI and GFCI behavior is beneficial, helping safeguard living spaces, kitchens, bathrooms, and other areas with higher safety demands.
• Part compatibility — part number B120DF, available from AmpState. If you’re unsure about fit, message us and we’ll help confirm compatibility with your panel.

Specifications

• Manufacturer: Siemens
• Part Number: B120DF
• Type: Circuit Breaker
• Amperage: 20 A
• Poles: 1
• Voltage: 120V AC
• Function: AFCI, GFCI, Dual-Function
• Mounting: Bolt-On

Ideal use cases

Use the Siemens B120DF when upgrading existing electrical protection in panelboards or load centers that require both arc-fault and ground-fault protection on a single circuit. It’s particularly suited for retrofit projects where keeping the same part number simplifies ordering and inventory. This breaker shines in kitchens, laundry rooms, bathrooms, basements, and other areas where enhanced safety is a priority without adding extra devices.

Installation and compatibility notes

Designed for bolt-on installation in Siemens distribution systems that support single-pole AFCI/GFCI units. While it’s a drop-in option for compatible panels, always verify that your specific panel accepts B-series bolt-on breakers to ensure a secure, code-compliant fit.

Need help matching a part number or confirming compatibility? Message us and we’ll help you confirm fit.