Siemens LMXD63A800 - 800 A, 600 V, 3-Pole Bolt-On Circuit Breaker | AmpState

Siemens LMXD63A800 is a rugged, 3-pole bolt-on molded case circuit breaker designed to deliver dependable branch-circuit overcurrent and short-circuit protection in panelboards and load centers. With an 800 A rating at 600 V, this unit meets the demands of larger feeders in residential, commercial, and light industrial settings while maintaining precise protection performance.

• Secure bolt-on mounting provides a rigid, vibration-resistant bus connection, reducing movement and keystone wear in busy electrical environments.
• Thermal-magnetic trip unit delivers stable, repeatable protection by combining heat-based current sensing with instantaneous magnetic trip for short circuits—helping to minimize nuisance trips and protect downstream equipment.
• Three-pole design accommodates three-phase systems, enabling efficient protection of multi-phase feeders and balanced loading in panelboards.
• 800 A, 600 V rating makes it suitable for large branch circuits, feeders, and service entrances within OEM load centers and panelboards.
• OEM compatibility engineered to pair with matching Siemens load centers and panelboards, ensuring seamless integration and reliability across installations.
• Versatile applications ideal for residential, commercial, and light industrial environments where durable, code-compliant protection is required.

Technical snapshot

• Manufacturer: Siemens
• Part Number: LMXD63A800
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 800 A
• Voltage Rating: 600 V
• Number of Poles: 3
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Practical use cases

Use the LMXD63A800 to protect large feeders feeding subpanels in commercial spaces such as offices, retail locations, and small data rooms. It’s also well-suited for main feeders in light industrial setups where vibration resistance and secure connections matter—the bolt-on design keeps connections tight in environments with equipment like motors, HVAC units, and other heavy loads. When upgrading or replacing OEM parts, this Siemens breaker ensures compatibility, reliability, and consistent trip characteristics you can count on.

Why this design matters

Compared with other mounting styles, bolt-on circuit breakers like the LMXD63A800 deliver superior mechanical stability, which translates to fewer connection faults over time and more predictable protection during fault conditions. The thermal-magnetic trip mechanism provides fast magnetic response to short circuits while accommodating typical overload scenarios, helping you protect wiring, panels, and connected equipment from damage.

Buying with confidence

AmpState provides genuine Siemens parts, ensuring authentic performance and compatibility with your existing Siemens load centers and panelboards. The LMXD63A800 is a purpose-built choice for anyone needing robust, high-capacity protection in demanding electrical environments. Ready to upgrade or outfit a panel with reliable branch-circuit protection? This 3-pole bolt-on breaker is designed to meet the needs of professional installations where safety, reliability, and long-term integrity matter.