Siemens QJ22B125 125A 2P Circuit Breaker, Bolt-On | AmpState

The Siemens QJ22B125 bolt-on circuit breaker delivers dependable overcurrent protection for panelboards, load centers, and electrical distribution systems. This 125-amp, two-pole unit is purpose-built for retrofit work and maintenance planning where keeping the exact part number matters for inventory control and service reliability. Engineered by Siemens, it integrates smoothly with existing QJ-series gear to simplify upgrades and field replacements.

Key features

• Bolt-On mounting for secure, field-friendly installation in compatible Siemens panels, enabling fast swaps during upgrades or repairs.
• 2-pole configuration provides simultaneous protection of two conductors, ideal for common two‑pole circuits within distribution setups.
• 125 A amperage rating delivers robust protection for feeders and branch circuits that require reliable, high-capacity interrupting capability.
• Part Number QJ22B125 supports retrofit consistency and easy spare-part planning in service fleets and building maintenance programs.
• AmpState availability ensures accessible sourcing and support when you’re aligning compatibility with your existing gear.

Why this matters for your project

If you’re upgrading an existing Siemens panel or planning routine maintenance, the QJ22B125 offers a straightforward, compatible replacement that minimizes downtime. Its bolt-on design reduces mounting complexity, while the two-pole protection aligns with standard distribution configurations. This makes it a reliable choice for electricians and facility managers who need predictable performance and easy logistics.

Use cases and ideal applications

• Retrofit projects where inventory stability and compatibility with current panelboards are critical
• Maintenance planning for ongoing electrical distribution systems across commercial, industrial, or multi‑site facilities
• Spare-part provisioning for fleets that rely on Siemens QJ-series breakers to maintain consistent protection across installations
• Upgrades or replacements in existing Siemens installations where a 125 A, 2-pole solution is appropriate

Specifications at a glance

• Manufacturer: Siemens
• Part Number: QJ22B125
• Product Type: Circuit Breaker
• Amperage: 125 A
• Poles: 2
• Mounting: Bolt-On
• Applications: Panelboards, load centers, and electrical distribution

Need help matching a part number or confirming compatibility? Message us and we’ll help you confirm fit for your specific panel or distribution setup. Available from AmpState, the QJ22B125 is a practical, reliable choice for maintaining consistent protection across your electrical system.