Siemens HB3B040 40A 3P 240V Circuit Breaker | AmpState

Discover reliable, OEM-grade protection with the Siemens HB3B040 40A, 3P, 240V circuit breaker. Built for demanding electrical environments, this unit is purposefully designed for panelboards, load centers, and distribution systems where precise trip protection and dependable performance matter most.

• Exact OEM part for seamless BOM alignment: The HB3B040 designation ensures compatibility with your original equipment and documentation, making replacements straightforward and downtime minimal.
• Three-pole, 240V operation: Ideal for three-phase circuits that run at 240V, delivering balanced protection across all phases for reliability in industrial and commercial installations.
• 40 A protection rating: Calibrated to guard feeders and branch circuits against overloads and short circuits, helping safeguard downstream equipment without over-tripping sensitive controls.
• Versatile installation appeal: Commonly employed in panelboards, load centers, and electrical distribution setups where robust, coordinated protection is required.
• Smart stocking choice: Perfect for replacement projects and spare inventories, ensuring your BOM stays consistent with the original part number and reducing project risk.

Why choose this Siemens breaker? Because it delivers OEM-grade reliability that technicians and facilities managers trust. By matching the exact trip characteristics and electrical footprint of your existing system, it helps maintain protective coordination and minimizes downtime during swaps or restorations. If you’re rebuilding a panel or refreshing spares, the HB3B040 keeps your distribution network compliant and ready for operation.

Practical use cases

• Replacing an aging or failed 3P 240V breaker in a residential-turned-commercial multi-use panel where three-phase protection is required.
• Stocking spare breakers for service vans or maintenance bays to speed on-site repairs and reduce equipment downtime.
• Maintaining BOM integrity during panel retrofits or upgrades that preserve the original Siemens configuration.

Helpful support

Available from AmpState, the HB3B040 is ready to ship to keep your project on schedule. If you’re unsure about fit or compatibility with your current panel or BOM, message us and we’ll help you confirm that this exact part is the right match for your system.