Siemens NMX3A800 Circuit Breaker, 800A, 3-Pole, 600V

The Siemens NMX3A800 Circuit Breaker is purpose-built for demanding industrial electrical service, maintenance, and replacement projects. This high-capacity, three-pole device is engineered to protect and enable reliable power distribution in heavy-load environments, with a 800 A rating and a 600 V operating window. Use the part number NMX3A800 to verify exact compatibility with your panel and application requirements.

Why the NMX3A800 stands out

• 800 A rating - provides robust protection for large motors, furnaces, presses, and other high-current equipment common in industrial settings.
• 3-pole configuration - ideal for three-phase power systems, delivering synchronized protection across all three phases in a single device.
• 600 V maximum - compatible with standard industrial distribution networks, enabling safe, reliable operation on typical plant mains.
• Siemens integration - designed to work seamlessly within Siemens switchgear and control architectures, simplifying wiring, labeling, and maintenance workflows.
• Clear compatibility pathway - verify fit by part number and application requirements to avoid mismatches in panel boards and service panels. Need help matching a part number or confirming compatibility? Message us and we'll help.

Ideal use cases

• Main power feeds and disconnects for manufacturing lines, CNC machines, and process equipment.
• Protection for large motor drives, conveyors, and industrial automation panels where uninterrupted uptime matters.
• Replacement in existing Siemens installations, ensuring continuity with the same protection philosophy and mounting standards.
• New installations requiring a proven, high-current, three-phase protective device with straightforward field compatibility checks.

Key specifications at a glance

• Part Number: NMX3A800
• Amperage: 800 A
• Poles: 3
• Voltage: 600 V
• Product Type: Circuit Breaker (industrial)

When upgrading or replacing protective devices in demanding environments, the Siemens NMX3A800 offers a reliable, performance-driven solution that aligns with established Siemens panels and control systems. By focusing on compatible part numbers and application requirements, you can ensure seamless integration, faster commissioning, and durable protection for your critical loads. If you’re unsure about fitment, remember the note above: verify fit by part number and application requirements, and reach out if you need assistance matching a part number or confirming compatibility.