Siemens HMXD63B500 - 500 A, 3-Pole Bolt-On Circuit Breaker | AmpState

The Siemens HMXD63B500 500A, 3-Pole Bolt-On Molded Case Circuit Breaker is engineered to deliver dependable, high-current protection for demanding electrical panels. Built to protect residential, commercial, and light industrial applications, this bolt-on unit is ready to anchor your panelboard or loadcenter with a rock-solid connection and precise protection.

• Secure bolt-on mounting: provides a rigid, vibration-resistant bus connection, helping maintain consistent electrical contact even in panels subjected to movement or vibration.
• Thermal-magnetic trip unit: combines stable thermal overload protection with instantaneous magnetic trip action for reliable response to both gradual overloads and high-current faults.
• OEM-compatible design: engineered to pair with matching Siemens panelboards and loadcenters, ensuring a clean fit, straightforward replacement, and consistent system performance.
• High-current capability: 500A rating makes it suitable for main feeders and large branch circuits in service panels and distribution setups.
• Three-pole configuration: ideal for 3-phase systems, providing coordinated protection across multiple phases with one compact device.

Why this matters in real-world installations

• Reduces downtime and maintenance risk with a robust, vibration-resistant connection that stays secure over time.
• Delivers predictable protection under a range of fault conditions thanks to its thermal-magnetic trip mechanism.
• Offers a seamless, dependable upgrade or replacement path within Siemens panel ecosystems, helping maintain warranty validity and system integrity.

Use cases and ideal applications

• Upgrading or commissioning 500A service feeders in residential or light commercial panels that require reliable heavy-duty protection.
• Feeding large-draw equipment in commercial spaces while maintaining safe, code-compliant overcurrent protection.
• Replacing worn or damaged three-pole breakers in Siemens panelboards to restore optimal protection without compatibility concerns.

Technical snapshot

• Manufacturer: Siemens
• Part number: HMXD63B500
• Type: Thermal-magnetic molded case circuit breaker
• Amperage rating: 500 A
• Number of poles: 3
• Mounting style: Bolt-on
• Applications: Branch circuit overcurrent and short-circuit protection

Shop confidently with AmpState — authentic Siemens hardware designed for durability, straightforward installation, and long-term protection of your electrical system.