Siemens HMXD63B800L - 800 A, 600 V, 3-Pole Bolt-On Circuit Breaker | AmpState

Meet the Siemens HMXD63B800L—a robust 800 A, 600 V, 3-pole bolt-on molded case circuit breaker designed for dependable branch circuit overcurrent and short-circuit protection in panelboards and loadcenters. Engineered for consistent performance in demanding environments, this device helps safeguard electrical systems across residential, commercial, and light industrial applications.

Key benefits that matter in real-world installs

• Secure bolt-on mounting delivers a rigid, vibration-resistant connection to the bus, reducing loosening risk and maintaining reliable electrical continuity in panel assemblies.
• Thermal-magnetic trip unit provides stable, repeatable protection by combining thermal response to gradual overloads with instantaneous magnetic trip for short circuits—minimizing nuisance trips while protecting assets.
• 3-pole design for three-phase systems efficiently protects multi-phase circuits common in commercial and light industrial environments.
• 600 V operating voltage supports a wide range of distribution applications while meeting standard industry requirements.
• OEM-compatible designed to work with matching Siemens loadcenters and panelboards, ensuring harmonious integration and streamlined replacement in existing fleets.
• Versatile application suitable for residential, commercial, and light industrial installations—particularly where reliable branch-circuit protection and panel compatibility matter most.

Technical snapshot

• Manufacturer: Siemens
• Part Number: HMXD63B800L
• Type: Thermal-magnetic molded case circuit breaker (MCCB)
• Amperage Rating: 800 A
• Voltage Rating: 600 V
• Number of Poles: 3
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Why this breaker solves real-world problems

In any installation where multiple circuits converge, reliable protection is essential to prevent damage from overloads and short circuits. The HMXD63B800L’s thermal-magnetic trip system adapts to evolving load conditions—gliding between time-delayed responses for gradual faults and immediate action during abrupt faults. Its bolt-on design reduces mechanical stress and improves bus bar integrity in vibration-prone environments, making it a dependable choice for panel upgrades or new builds that demand long-term reliability.

Ideal use scenarios

• New commercial panels where three-phase distribution requires strong, stable protection
• Residential/light-industrial panelboards needing an OEM-compatible, bolt-on MCCB
• Panelboard retrofits where secure mounting and consistent trip performance matter
• Systems requiring clear protection margins for high-current branch circuits

Installation and maintenance tips

• Verify compatibility with your Siemens loadcenter or panelboard to ensure seamless integration and correct trip settings.
• Prepare for bolt-on mounting with the appropriate hardware specified by Siemens installation guidelines to maintain a solid bus connection.
• Regularly test the trip mechanism following your facility’s maintenance schedule to confirm reliable operation under fault conditions.
• Document the part number (HMXD63B800L) and ratings for future maintenance or panel upgrades to streamline service calls.

With the Siemens HMXD63B800L, you’re choosing a purpose-built solution for robust, reliable overcurrent protection in three-phase panel systems. Its combination of secure mounting, responsive thermal-magnetic protection, and OEM compatibility makes it a thoughtful, long-term investment for any professional electrical installation.