Siemens B3100 100A 3P Circuit Breaker, Bolt-On | AmpState

Meet the Siemens B3100 100A 3P Bolt-On Circuit Breaker—an essential safeguard for panelboards, load centers, and electrical distribution systems. Built by Siemens, this 3-pole unit delivers dependable overcurrent protection for multidrive circuits, helping keep critical equipment online and safely fenced from faults.

• Bolt-On mounting provides a fast, secure mechanical attachment to standard Siemens panelboard buses, simplifying installation and reducing service time during replacements or upgrades.
• 100 A, 3-pole design delivers reliable protection for main feeders and multi-circuit distributions, balancing protection with uninterrupted power delivery across three phases.
• Direct BOM alignment is ideal for replacement projects and stocking spares when you need to maintain the original bill of materials and part-number consistency.
• Strategic spare stocking minimizes downtime during maintenance or panel refurbishments by keeping a ready-to-install breaker on hand.
• Part Number B3100 from Siemens ensures compatibility with existing equipment and installation standards in compatible panelboards and load centers.

Designed for reliability in electrical distribution applications, the Siemens B3100 supports safer, smarter protection for circuits feeding motors, lighting, and general-purpose outlets across commercial and industrial environments. Its bolt-on form factor means fewer complications during replacement projects, and its 3-pole configuration helps coordinate with three-phase systems to prevent imbalance and protect downstream equipment.

Who should consider this breaker? Maintenance teams, facilities managers, and electricians who work with Siemens-compatible panelboards and load centers will gain a straightforward upgrade path or a dependable spare that aligns with the original design. If you’re refurbishing an installation, stocking the B3100 helps preserve BOM integrity while ensuring you can execute quick, code-compliant replacements without altering other components.

How does this compare to alternatives? Among bolt-on, mid-range 3P breakers, the Siemens B3100 is engineered to harmonize with Siemens distribution products, reducing interconnect issues and compatibility questions during commissioning. It’s a practical choice when your project specifies Siemens hardware or when you want a proven, manufacturer-backed solution with clear part-number traceability.

Need help matching a part number or confirming compatibility? Message us and we’ll help you confirm fit. This item is available from AmpState, ready to support your replacement, stocking, or refurbishment strategy for reliable electrical protection.