Siemens MXD63B800L - 800 A, 600 V, 3-Pole Bolt-On Circuit Breaker | AmpState

The Siemens MXD63B800L is engineered to deliver dependable protection for your electrical distribution in panelboards and loadcenters. With an 800A rating, a 600V maximum voltage, and a rugged 3-pole bolt-on design, this molded case circuit breaker is ready to handle high-demand branch circuits and short-circuit events with confidence.

Key advantages that set the MXD63B800L apart

• Secure bolt-on mounting provides a rigid, vibration-resistant bus connection, helping maintain reliable performance in challenging environments.
• Thermal-magnetic trip unit delivers stable, repeatable protection across varying loads and fault conditions, helping to protect wiring and equipment from damage.
• OEM-compatible design is ready to drop into matching Siemens OEM loadcenters and panelboards for a seamless retrofit or new installation.
• Three-pole configuration supports balanced protection for three-phase systems commonly found in commercial and light industrial settings.
• High-capacity protection at 800A and 600V makes it suitable for main feeders, heavy-duty branch circuits, and equipment with substantial starting currents.
• Purpose-built for branch circuit overcurrent and short-circuit protection in a range of applications from residential panels to commercial distribution boards.

What this means for your installation

The Siemens MXD63B800L is designed to slot into your existing equipment with minimal hassle, delivering reliable protection without compromising panel real estate or service continuity. Its bolt-on construction simplifies mounting in compatible panelboards, while the thermal-magnetic trip mechanism guards against both gradual overcurrent and instantaneous short circuits. This makes it a practical choice for projects that demand durability, long service life, and predictable protection performance.

Ideal use cases

Ideal for residential service panels that require robust main or feeder protection, commercial distribution boards that power lighting, HVAC, and receptacle circuits, and light industrial panels where higher fault currents are a concern. The MXD63B800L is well-suited for retrofit projects where an existing Siemens-based system calls for a like-for-like replacement, ensuring compatibility and simplified maintenance.

Technical specifications at a glance

• Manufacturer: Siemens
• Part number: MXD63B800L
• 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

When you’re upgrading or expanding an electrical system, the Siemens MXD63B800L offers a precise combination of high-capacity protection, rugged mounting, and OEM compatibility that helps you achieve reliable performance today and solid service life tomorrow.