Siemens | CM3B800 | Circuit Breaker | 800A | 3-Pole | 600V

Siemens CM3B800 Circuit Breaker — 800A, 3-Pole, 600V

Engineered for high-demand electrical environments, the CM3B800 is the Siemens answer for dependable overcurrent protection in industrial panels. With an 800-amp rating, a three-pole configuration, and a 600-volt operating ceiling, this breaker is purpose-built for demanding 3-phase systems where safety, reliability, and uptime matter most.

• 800A amperage rating— supports heavy loads and motor circuits common in manufacturing, processing, and facilities management.
• 3-Pole design— provides complete three-phase protection, helping maintain balanced power distribution and safer shutdowns.
• 600V system capability— suitable for standard industrial power distribution within facilities that run at higher voltages.
• Part reference CM3B800— using the exact part number ensures compatibility with Siemens panels, accessories, and mounting geometry.
• Ideal for maintenance, retrofit, and replacement— a practical choice when upgrading old gear, expanding capacity, or restoring protected circuits to original specifications.

Why this specific CM3B800 matters

Choosing a breaker that aligns with your existing equipment isn’t just about matching current ratings. It’s about preserving system integrity, minimizing downtime, and ensuring your protection scheme behaves as intended under fault conditions. The CM3B800 is designed to slot into compatible Siemens enclosures, maintaining the same electrical characteristics and mounting footprint you expect from a trusted brand.

Use cases and ideal applications

• Retrofit projects in aging distribution panels that service large motors, pumps, or conveyors
• Replacement in facilities upgrading to higher amperage capabilities without changing the panel backbone
• Maintenance cycles for industrial plants where consistent, reliable three-phase protection at 600V is required

Compatibility and purchasing tips

Important: confirm fit and ratings before ordering. The CM3B800 part number is the best reference for compatibility with your Siemens equipment. When planning a replacement or retrofit, verify that your system is three-phase, 600V, and supports an 800A breaker, and refer to your panel’s documentation to ensure proper form factor and trip characteristics align with this unit.