Siemens BF125 A - 25 A, 120 V, 1-Pole Bolt-On Circuit Breaker | AmpState

Meet the Siemens BF125A — a dependable 25A, 120V, 1-pole bolt-on molded case circuit breaker designed to shield your panelboards and load centers from overcurrent and short-circuit events. Available from AmpState, this compact unit is built to perform where space is at a premium without compromising protection.

Why the BF125A stands out

• Secure bolt-on mounting: a rigid, vibration-resistant bus connection that stays tight through the life of the panel, reducing chances of loosened contacts and nuisance trips.
• Thermal-magnetic trip unit: combines precise thermal overload protection with fast magnetic response for instantaneous short-circuit protection, delivering stable and repeatable performance.
• OEM-compatible engineering: designed to align with matching Siemens OEM load centers and panelboards for seamless integration, proper coordination, and easier maintenance across your electrical system.
• Compact 1-pole design: ideal for protecting a single branch circuit in residential, commercial, and light industrial installations without sacrificing reliability.

Technical snapshot

• Part number: BF125A
• Amperage rating: 25A
• Voltage rating: 120V
• Poles: 1
• Mounting style: Bolt-on
• Type: Thermal-magnetic molded case circuit breaker
• Application: Branch circuit overcurrent and short-circuit protection

Ideal use cases

Residential panels benefit from a compact, reliable protection device for lighting and receptacle circuits. In commercial settings, the BF125A helps protect small circuits within tight panel footprints, ensuring quick, predictable trips when an overload or fault occurs. In light industrial environments, it provides robust branch circuit protection for control panels, outlets, and auxiliary equipment—precisely where dependable protection matters most.

Practical installation guidance

• Verify that your panelboard or load center supports bolt-on breakers and is compatible with the BF125A’s specifications.
• Torque mounting screws to the manufacturer’s recommended setting to maintain a secure connection in environments with vibration or temperature cycling.
• Pair with appropriately sized conductors and follow NEC guidelines for branch circuit protection and system coordination within the same enclosure.

The Siemens BF125A delivers more than just protection—it offers peace of mind for installers and building managers who value consistent trip performance, durable construction, and seamless OEM compatibility. With its bolt-on reliability, thermal-magnetic protection, and 1-pole configuration, this breaker is a straightforward, long-lasting choice for distributing power safely across residential, commercial, and light industrial landscapes.