Siemens QR23B125 125A 3P 240V Circuit Breaker, Bolt-On | AmpState

The Siemens QR23B125 is a bolt-on, three‑pole circuit breaker built for reliable protection in panelboards, load centers, and electrical distribution networks. With a 125 A rating at 240 V, this part is your precise fit for replacement projects and for stocking spares that keep the BOM aligned to the original Siemens part number.

Key benefits and what makes it stand out

Exact BOM alignment—Designed to match the Siemens QR series, the QR23B125 ensures you can swap in a like-for-like part without re-engineering a panel or updating wiring plans. This is especially valuable when maintaining documentation and service history in commercial and industrial settings.

Reliable bolt-on mounting—The bolt-on design simplifies on-site installation in compatible panelboards and distribution systems, enabling a sturdy, secure connection that resists vibration and arcing in demanding environments.

Clear 125 A, 3P, 240 V specifications—This breaker protects circuits up to 125 amps across three poles at 240 volts, making it suitable for general distribution protection and for safeguarding multi‑circuit layouts in mid‑ to large‑sized panels.

Practical for replacements and spares—Keep this part on hand to minimize downtime: it integrates smoothly into established electrical distributions while preserving original design intent and performance characteristics.

Specifications at a glance

• Manufacturer: Siemens
• Part number: QR23B125
• Type: Circuit Breaker
• Amperage: 125 A
• Poles: 3
• Voltage: 240 V
• Mounting: Bolt-On
• Applications: Panelboards, Load centers, Electrical distribution
• Availability: Sold through AmpState

Ideal use cases

• Replacing a failed or worn-out breaker in Siemens panelboards and compatible distributions
• Building a ready-to-go spare kit that preserves BOM integrity and original part lineage
• Upgrading protective coverage in commercial spaces where three-pole, 125 A protection is required

Why it’s a smart choice

Choosing the QR23B125 means you’re selecting an exact, purpose-built component that aligns with your existing electrical architecture. Its bolt-on format supports fast service when replacing aging breakers, helping to minimize downtime and maintain consistent protection across the system. By sticking to the original part number and specifications, you preserve the designed coordination of overcurrent protection, trip characteristics, and wiring layouts.

Need confirmation on fit? Our AmpState team is ready to assist with part-number matching and compatibility checks to ensure this 125 A, 3P, 240 V breaker is the right choice for your panel and distribution setup.

Purchase with confidence—AmpState stocks the Siemens QR23B125, delivering dependable circuit protection you can trust for ongoing reliability in your electrical distribution network.