Siemens CMD63L800 - 800 A, 600 V, 3-Pole Bolt-On Circuit Breaker | AmpState

Siemens CMD63L800: 800A, 600V, 3-Pole Bolt-On MCCB for Robust Panel Protection

The Siemens CMD63L800 is a high-current, 3-pole bolt-on molded case circuit breaker designed to deliver reliable branch circuit overcurrent and short-circuit protection in panelboards and loadcenters. Built for demanding electrical environments, this CMD63L800 unit provides a secure, vibration-resistant connection and consistent protection performance you can trust under heavy use.

Key Features that Matter in the Field

• Secure bolt-on mounting for a rigid, vibration-resistant bus connection that minimizes loosening and maintains optimal electrical contact over time.
• Thermal-magnetic trip unit delivers stable, repeatable protection by combining thermal overload sensing with instantaneous magnetic response to short circuits.
• OEM-compatible design engineered to pair with matching Siemens loadcenters and panelboards, simplifying replacement and reducing compatibility concerns.
• Versatile applications suitable for residential, commercial, and light industrial installations that demand robust, high-current protection.

Technical Snapshot

• Manufacturer: Siemens
• Part Number: CMD63L800
• Type: Thermal-magnetic molded case circuit breaker (MCCB)
• Amperage Rating: 800 A
• Voltage Rating: 600 V
• Poles: 3
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Why This Breaker Fits Your System

When your electrical distribution must handle substantial load or tight fault protection, the CMD63L800 excels. The bolt-on design ensures a solid, low-resistance connection to the bus, which translates to more predictable trip behavior and less maintenance due to vibration or connection wear. The built-in thermal-magnetic trip unit provides a well-balanced protection curve—allowing normal operation under transient surges while quickly shedding power during dangerous faults. And with OEM compatibility, you gain a straightforward, reliable integration path in Siemens panelboards and loadcenters, reducing the risk of misfit components in critical applications.

Ideal Use Scenarios

• Large residential subpanels or main distribution feeders requiring high-current protection with dependable reset behavior.
• Commercial electrical rooms where panel reliability and quick fault isolation minimize downtime.
• Light industrial installations needing robust protection for high-demand branch circuits without frequent tripping.

Practical Guidance for Installers and Prospects

• Use CMD63L800 with Siemens panelboards and loadcenters designed to accept this bolt-on MCCB to ensure optimal fit and performance.
• Rely on the thermal-magnetic trip for predictable response to overloads and short circuits, helping to safeguard downstream equipment and wiring.
• For service upgrades or replacements, verify current ratings and panel compatibility to maintain coordinated protection across the distribution system.
• During installation, ensure secure mounting and proper alignment with the bus connections to preserve long-term reliability and minimize contact resistance.

With the Siemens CMD63L800, you’re choosing a purpose-built, high-current protection solution that aligns with Siemens’ panel and loadcenter ecosystem while delivering dependable performance across residential, commercial, and light industrial applications. Engineered for durability, compatibility, and precise protection, this 800A, 600V, 3-pole bolt-on MCCB stands ready to support safe, efficient electrical distribution in demanding environments.