Siemens HMX3B800L 800A 3-Pole 600 V Circuit Breaker

The Siemens HMX3B800L 800A 3-Pole 600 V Circuit Breaker is engineered to protect large-scale electrical feeders in demanding industrial environments. With an 800 A current rating and a robust 3-pole design, it ensures balanced, reliable protection across all three phases in 600 V power systems, helping keep equipment safer and downtime to a minimum.

• Part Number: HMX3B800L
• Current rating: 800 A
• Poles: 3
• Voltage rating: 600 V

Why designers and maintenance teams choose the HMX3B800L

• The 800 A rating is suited for large distribution branches and equipment circuits, reducing the risk of nuisance trips while safeguarding critical loads.
• Three-phase coordination: A true 3-pole configuration ensures synchronized interruption across all phases, promoting safer shutdowns and cleaner arc performance in fault conditions.
• 600 V system compatibility: Designed to integrate seamlessly with standard 600 V power distribution architectures found in industrial plants and facilities.
• dependable Siemens build: Leverages Siemens engineering heritage to deliver consistent performance in routine operation and intermittent fault scenarios.

Ideal use cases

• Protection for heavy-duty feeders in manufacturing lines and automation equipment rooms.
• Main distribution panels where multiple high-load circuits converge, requiring reliable multi-pole protection.
• Controlled protection for industrial power distribution in facilities with 600 V systems, including construction sites, processing plants, and large commercial campuses.

Practical considerations and installation notes

• Confirm that your panel or distribution setup is compatible with 3-pole 800 A breakers and 600 V systems to ensure proper fit and performance.
• Use within Siemens-compatible equipment layouts to maintain consistent electrical protection schemes across the facility.
• When performing inspections, verify ongoing contact integrity and clean connections to support reliable operation over time.