Siemens LMD63B800 - 800 A, 600 V, 3-Pole Circuit Breaker | AmpState

Meet the Siemens LMD63B800—an 800 A, 600 V, 3-pole molded case circuit breaker built to safeguard your panelboards and loadcenters. This unit delivers reliable branch circuit overcurrent and short-circuit protection for demanding residential, commercial, and light industrial applications, ensuring power stays within safe, predictable limits.

• Compact molded case design: Efficiently uses panel space so you can maximize circuit density without compromising protection or accessibility.
• Thermal-magnetic trip unit: Delivers stable, repeatable protection by coordinating overload (thermal) and short-circuit (magnetic) responses, reducing nuisance trips and protecting sensitive equipment.
• 3-pole configuration: Provides balanced protection for 3-phase systems, essential for modern commercial and light-industrial loads.
• 800 A, 600 V rating: Ideal for main feeders or large branch circuits in robust electrical installations, maintaining safety across high-demand scenarios.
• OEM-compatible: Engineered to pair with matching Siemens OEM loadcenters and panelboards, ensuring a seamless fit, consistent trip characteristics, and straightforward replacement.

This breaker shines in environments where dependable protection and panel efficiency matter most. Use it to safeguard motor loads, HVAC feeders, lighting systems, and other high-current branch circuits in panelboards that demand reliable, industry-standard performance. The LMD63B800 is designed to integrate with Siemens’ ecosystem, helping you maintain consistent protection curves and simplify maintenance planning.

Why choose Siemens LMD63B800 over generic options? It’s more than a metal box with a switch—it’s a purpose-built protection device engineered to align with Siemens’ panel platforms. The molded case design, paired with a thermal-magnetic trip mechanism, provides predictable response under a range of operating temperatures and load profiles, helping you avoid unexpected outages and confusion during troubleshooting.

Technical snapshot

• Manufacturer: Siemens
• Part Number: LMD63B800
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 800 A
• Voltage Rating: 600 V
• Number of Poles: 3
• Application: Branch circuit overcurrent and short-circuit protection

Practical tips for installation and use: verify compatibility with your specific Siemens panelboard model, follow local electrical codes, and ensure the panel’s bus rating aligns with an 800 A breaker. For best results, pair this MCCB with other Siemens protection devices in the same system to maintain coordinated protection and serviceability across the electrical distribution network.