Siemens BF120 20A 1P 120V Circuit Breaker, GFCI, Bolt-On | AmpState

The Siemens BF120 is a trusted, single-pole, 20-amp, 120-volt GFCI bolt-on circuit breaker designed for seamless protection in panelboards, load centers, and broader electrical distribution systems. When ground-fault protection is a must, this unit interrupts power at the first sign of imbalance, helping reduce the risk of electric shock on affected circuits.

Designed with replacement projects in mind, the BF120 keeps your BOM aligned to the original part number, making stocking and swap-in installations straightforward. Its bolt-on mounting delivers a secure, quicker connection in compatible panels, minimizing downtime during service or upgrades—an essential advantage for technicians and facilities teams managing busy electrical rooms.

Key benefits and what makes it stand out

• GFCI protection on a 20A, 1-pole, 120V platform for reliable ground-fault interruption on applicable circuits.
• Bolt-On design for faster, cleaner installation in compatible Siemens panelboards and load centers.
• Authentic Siemens part with part number BF120, suited for precise replacement and BOM continuity.
• Versatile utility in electrical distribution configurations, ideal for service panels, retrofit projects, and spare part stocking to prevent maintenance delays.

Ideal use cases — replace a failed breaker in an existing Siemens panel, keep a spare on hand to minimize downtime during routine maintenance, or upgrade circuits that require ground-fault protection in 120V systems. Common applications include kitchens, bathrooms, laundry areas, and outdoor outlets where protection against shock is prioritized.

How this compares to non-GFCI solutions — if your installation requires rapid interruption for ground faults, the BF120 adds an essential safety layer that standard overcurrent breakers don’t provide. It’s the natural choice when code-compliant protection and quick fault isolation are priorities in your 120V distribution network.

Compatibility and assistance — this BF120 is positioned for use with Siemens-compatible panelboards and load centers. If you’re unsure about fit for your exact panel, AmpState offers support to help confirm compatibility and ensure you’re ordering the correct part for your electrical system.

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

Specifications at a glance

• Amperage: 20 A
• Poles: 1 Pole
• Voltage: 120V
• Type: GFCI, Bolt-On
• Manufacturer: Siemens
• Part Number: BF120