Siemens MXD63L800 - 800 A, 600 V, 3-Pole Bolt-On Circuit Breaker | AmpState

The Siemens MXD63L800 is a rugged 3-pole 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 and a 600 V maximum, it’s built to handle demanding commercial and light industrial electrical needs while remaining compatible with Siemens OEM family panels.

• Secure bolt-on mounting for a rigid, vibration-resistant bus connection: The bolt-on design anchors firmly to the panel, reducing movement and ensuring consistent electrical contact even in environments with equipment vibration or periodic motion.
• Thermal-magnetic trip unit for stable, repeatable protection: Combines adaptive thermal protection with instantaneous magnetic tripping, delivering reliable isolation of fault conditions across temperature changes and load fluctuations.
• OEM‑grade compatibility: Specifically engineered to fit matching Siemens load centers and panelboards, promoting proper coordination with other protective devices and straightforward replacement in existing installations.
• Versatile performance for a range of applications: Suitable for residential, commercial, and light industrial panels, enabling large branch circuits and feeders to be protected under a single, consistent protection scheme.
• Durable, field-ready construction: Molded case design resists impact, dust, and moisture exposure, delivering long‑term reliability in demanding electrical environments.

Technical snapshot

• Manufacturer: Siemens
• Part number: MXD63L800
• Type: Thermal-magnetic molded case circuit breaker (MCCB)
• Amperage rating: 800 A
• Voltage rating: 600 V
• Number of poles: 3
• Mounting style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Use this MXD63L800 breaker when you need robust, predictable protection for high‑current 3‑phase circuits. It’s an excellent choice for upgrading panelboards to handle heavier loads, protecting motor feeders, HVAC equipment, large lighting banks, and other critical branch circuits in commercial spaces or light industrial settings. The bolt-on design simplifies integration into compatible panelboards and helps maintain a solid electrical backbone even in renovations or panel replacements. With Siemens’ trusted thermal‑magnetic technology, you gain precise trip performance and peace of mind knowing that fault conditions will be isolated quickly and reliably.