Siemens HMX3B800L - 800 A, 3-Pole Circuit Breaker | AmpState

Siemens HMX3B800L is an 800A, 3-pole molded case circuit breaker engineered for reliable branch-circuit overcurrent and short-circuit protection in panelboards and loadcenters. Built to withstand demanding environments, this unit is suited for residential, commercial, and light industrial applications where dependable protection matters most.

Key advantages that matter in real-world setups

• Compact molded case design maximizes panel space and simplifies installation, helping you fit essential protection without crowding the enclosure.
• Thermal-magnetic trip unit delivers stable, repeatable protection performance, responding to both sustained overcurrents and short circuits to safeguard conductors and equipment.
• Three-pole configuration ideal for three-phase systems, providing coordinated protection across all phases.
• OEM-ready compatibility designed to pair with matching Siemens loadcenters and panelboards for seamless integration and reliable operation.
• High-amperage capability 800A rating is suitable for main feeders or large subfeed circuits in modern distribution panels.

Where and how you’ll use it

Install the Siemens HMX3B800L in main service panels, subpanels, or distribution panels where a robust 800A, 3-pole breaker is required. Its compact form and dependable protection make it a practical choice for projects that demand space efficiency without sacrificing safety or performance.

Technical snapshot

• Manufacturer: Siemens
• Part number: HMX3B800L
• Type: Thermal-magnetic molded case circuit breaker
• Amperage rating: 800A
• Number of poles: 3
• Application: Branch circuit overcurrent and short-circuit protection