Siemens CMD63S800 A - 800 A, 600 V, 3-Pole Bolt-On Circuit Breaker | AmpState

Meet the Siemens CMD63S800A, a high-capacity 3-pole bolt-on molded case circuit breaker designed for demanding panelboards and load centers. With an 800A rating and 600V capability, this device delivers reliable branch circuit overcurrent and short-circuit protection where it matters most in residential, commercial, and light industrial environments.

Why this breaker stands out

• Secure bolt-on mounting: a rigid, vibration-resistant bus connection that stays tight through busy electrical environments and equipment start-ups.
• Thermal-magnetic trip unit: combines precise overload protection with fast short-circuit response, delivering stable, repeatable protection performance over the life of the installation.
• OEM‑compatible design: engineered to work seamlessly with matching Siemens OEM load centers and panelboards, helping you maintain system integrity and warranty compliance.
• Versatile application: engineered for residential, commercial, and light industrial panel installations where dependable protection is essential.

What problems does it solve?

• Prevents damage from sustained overloads and catastrophic short circuits on high-capacity branch circuits.
• Minimizes nuisance trips through a well-tuned thermal-magnetic trip curve, keeping equipment uptime high.
• Eliminates mounting flexibility issues common with loose or non-standard connections by using a bolt-on, fixed installation.

Technical snapshot

• Manufacturer: Siemens
• Part number: CMD63S800A
• Type: Thermal-magnetic molded case circuit breaker (MCCB)
• Amperage rating: 800A
• Voltage rating: 600V
• Poles: 3
• Mounting style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection in panelboards and loadcenters

Ideal for installation scenarios

Use the CMD63S800A in service panels, distribution panels, or control panels that require robust, high-capacity protection. It’s particularly well-suited where panel vibration is a factor, or where a secure, stiff connection is critical to maintain electrical integrity over time. If you’re upgrading or replacing aging protection in large residential complexes, small to midsize commercial facilities, or light industrial equipment feeds, this 800A bolt-on breaker provides a dependable, OEM‑aligned solution.

Designed to integrate smoothly with Siemens load centers and panelboards, the CMD63S800A helps maintain consistent protection performance while aligning with existing equipment and wiring practices. For installers and facilities teams prioritizing reliability, compatibility, and clear performance in demanding environments, this Thermall-Magnetic MCCB is a clear choice.