Siemens LGB2B125B - 125 A, 600 V, 2-Pole Bolt-On Circuit Breaker | AmpState

Siemens LGB2B125B is a 2-pole bolt-on molded case circuit breaker rated at 125 A and 600 V, designed to deliver reliable branch circuit overcurrent and short-circuit protection in panelboards and load centers. Built for durability and consistent performance, this breaker is a pragmatic choice for everyday electrical protection needs in residential, commercial, and light industrial settings.

• Secure bolt-on mounting provides a rigid, vibration-resistant connection to the bus, helping maintain electrical integrity even in panels subjected to movement or vibration.
• Thermal-magnetic trip unit delivers stable, repeatable protection by coordinating overloads (thermally) and rapid fault clearing (magnetically) for high-energy faults.
• OEM compatibility designed to work with matching Siemens loadcenters and panelboards, ensuring a proper fit and dependable performance.
• Versatile applications ideal for residential panels, commercial distributions, and light industrial service entrances where reliable protection is essential.
• Proven Siemens engineering backed by robust construction and long-standing industry trust for continuous protection you can count on.

Technical snapshot

• Manufacturer: Siemens
• Part number: LGB2B125B
• Type: Thermal-magnetic molded case circuit breaker
• Amperage rating: 125 A
• Voltage rating: 600 V
• Number of poles: 2
• Mounting style: Bolt-on
• Applications: Branch circuit overcurrent and short-circuit protection

Designed for reliability in real-world panels, the LGB2B125B is the right choice when you need solid protection with a secure connection. Use it to upgrade a panelboard, replace aging breakers, or outfit a new installation where predictable trip performance and a sturdy mounting scheme matter most. If you’re coordinating with Siemens loadcenters and panelboards, this bolt-on solution aligns with your system for streamlined, trustworthy protection.