Siemens CMD63B500 - 500 A, 600 V, 3-Pole Bolt-On Circuit Breaker | AmpState

The Siemens CMD63B500 3-Pole Bolt-On Molded Case Circuit Breaker is built to safeguard heavy-load branch circuits in panelboards and loadcenters with dependable, repeatable protection. With a 500A rating and a 600V capacity, this breaker is designed for residential, commercial, and light industrial applications where robust short-circuit and overcurrent protection are non-negotiable.

• Rigid, vibration-resistant mounting: Secure bolt-on installation creates a solid bus connection, minimizing movement and ensuring reliable contact even in environments with vibration or equipment start‑ups.
• Thermal-magnetic trip unit: Combines precise overcurrent sensing with fast short-circuit response for stable, repeatable protection across a wide range of fault conditions.
• OEM-compatible design: Specifically engineered to be used with matching Siemens OEM load centers and panelboards, streamlining installation and ensuring cohesive system protection.
• Three-pole protection: Perfect for three-phase circuits, providing coordinated protection for balanced commercial or light industrial electrical systems.
• High-capacity rating: 500A continuous current capability supports heavy feeders and demanding load profiles without frequent nuisance trips.
• Wide voltage capability: Rated up to 600V, making it suitable for a range of medium-to-large electrical installations.
• Versatile application: An ideal choice for branch-circuit protection in panelboards and loadcenters across residential, commercial, and light industrial settings.

With the CMD63B500, you’re choosing a solution designed to protect valuable electrical infrastructure—from panelboard feeders to interconnected distribution circuits. The bolt-on design reduces contact looseness and vibration-induced faults, while the thermal-magnetic trip unit delivers predictable response when faults occur. This combination translates to fewer unexpected outages, safer shutdowns during fault events, and easier maintenance over the lifetime of the installation.

Use cases and scenarios

• Upgrading or expanding service panels in commercial spaces where three-phase loads are common
• Protecting large feeder circuits in light industrial rooms where equipment startups generate brief surge activity
• Replacing aging breakers in Siemens-compatible panelboards to restore reliable overcurrent protection
• Implementing a robust main or feeder protection solution in new installations that require a high-current, three-pole device

Technical snapshot

• Manufacturer: Siemens
• Part Number: CMD63B500
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 500A
• Voltage Rating: 600V
• Number of Poles: 3
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Designed for installers who demand dependable performance and straightforward integration, the Siemens CMD63B500 delivers clear protection alignment with Siemens panelboards and loadcenters. Whether you’re upgrading an existing installation or designing a new system, this bolt-on breaker provides a solid foundation for safe, reliable electrical distribution.