Siemens LGB2B100B - 100 A, 600 V, 2-Pole Bolt-On Circuit Breaker | AmpState

Siemens LGB2B100B is a 100A, 600V, 2-pole bolt-on molded case circuit breaker designed to safeguard branch circuits in panelboards and load centers. Built for dependable overcurrent and short-circuit protection, it combines rugged, vibration-resistant mounting with precise electrical protection to keep systems running smoothly.

What makes it stand out

• Secure bolt-on mounting delivers a rigid, vibration-resistant bus connection that stays tight through wide temperature swings and equipment vibration.
• Thermal-magnetic trip unit provides stable, repeatable protection for both overloads and short circuits, helping to prevent nuisance trips while staying responsive during fault conditions.
• OEM-compatible design with matching load centers and panelboards, ensuring straightforward integration with Siemens and other approved assemblies.
• Versatile for multiple environments suitable for residential, commercial, and light industrial applications where reliable protection is essential.

Key specifications

• Manufacturer: Siemens
• Part Number: LGB2B100B
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 100 A
• Voltage Rating: 600 V
• Number of Poles: 2
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Ideal use cases

Use the LGB2B100B to protect feeder and branch circuits in residential service panels, commercial load centers, and light industrial distribution gear. It’s well-suited for applications that demand a robust, code-compliant breaker with a secure connection and reliable trip performance, including:

• Subpanels feeding lighting, receptacle, and small equipment circuits
• HVAC and commercial equipment feeders where stable protection is critical
• retrofit or replacement installations in panelboards designed for bolt-on MCCBs

Why this matters in real-world setups

The LGB2B100B isn’t just about amperage and voltage—it’s about dependable protection you can trust during daily operation and during fault events. The bolt-on mounting minimizes the risk of loose connections that can compromise protection, while the thermal-magnetic trip unit responds swiftly to short circuits without sacrificing stability during normal loads. When paired with compatible Siemens OEM panels, it provides a cohesive, maintainable protection solution for both new builds and upgrades.

Practical installation considerations

• Verify panelboard compatibility with the bolt-on mounting style and two-pole configuration before installation.
• Ensure wiring is correctly sized for 100 A service and that conductors meet applicable electrical codes and standards.
• Follow standard safety practices for servicing panelboards, including de-energizing the system and using appropriate lockout/tagout procedures.

What you gain

With the Siemens LGB2B100B, you’re choosing a reliable, purpose-built solution for protecting distributions and equipment. Its precise thermal-magnetic protection, rugged mounting, and OEM compatibility translate to fewer interruptions, easier maintenance, and a safer electrical distribution environment across residential, commercial, and light industrial applications.