Siemens QR22B125L 125A 240V 2-Pole Bolt-On Circuit Breaker

Si Siemens QR22B125L is a 125A, 240V, 2-pole bolt-on molded case circuit breaker designed to deliver dependable branch circuit protection in panelboards and loadcenters. Built for consistent performance, this breaker helps keep electrical systems safe and reliable across a range of environments—from homes to small commercial spaces.

• Secure bolt-on mounting: Achieves a rigid, vibration-resistant bus connection that stays reliably seated even in demanding installations.
• Thermal-magnetic trip unit: Provides stable, repeatable protection by responding accurately to both overloads and short-circuit conditions, reducing nuisance trips and protecting conductors.
• 2-pole, 240V design: Ideal for protecting multi-wire branch circuits and 240V loads, delivering balanced protection across both hot legs.
• OEM-compatible: Engineered to work with matching Siemens OEM loadcenters and panelboards, ensuring smooth compatibility and straightforward replacements.
• Application versatility: Suitable for residential, commercial, and light industrial applications where dependable overcurrent and short-circuit protection is required.

Why this matters: when you’re configuring or upgrading a panel, the QR22B125L provides robust protection for critical circuits without complicating installation. The bolt-on mounting minimizes movement and wear, helping maintain a solid connection in panels that experience vibration or temperature cycling. The thermal-magnetic trip keeps protection precise and predictable, so you can count on tripping at the right threshold exactly when you need it—safeguarding wiring, devices, and downstream equipment.

Use cases include upgrading residential service panels, replacing failed breakers in compatible Siemens loadcenters, or adding 125A protection to subpanels and feeders in small commercial or light industrial settings. It’s a practical choice for electricians and facility managers who value reliability, compatibility, and straightforward installation.

Technical snapshot:
- Type: Thermal-magnetic molded case circuit breaker
- Amperage rating: 125A
- Voltage rating: 240V
- Poles: 2
- Mounting: Bolt-on
- Application: Branch circuit overcurrent and short-circuit protection

Choose Siemens QR22B125L when you need a dedicated 125A, 240V, 2-pole solution that pairs seamlessly with Siemens panelboards and loadcenters, delivers durable performance in residential, commercial, and light industrial environments, and provides precise, reliable protection for the circuits that power your day-to-day operations.