Siemens 5SY63407 40A 3P 400V Circuit Breaker | AmpState

Introducing the Siemens 5SY63407 40 A 3-Pole 400 V Circuit Breaker—a precision device engineered to deliver dependable overcurrent protection for panelboards, load centers, and electrical distribution systems. Built for reliability in commercial and industrial settings, it helps you protect wiring, minimize nuisance trips, and maintain steady power delivery across critical circuits.

Key specifications you can trust:

• Manufacturer: Siemens
• Part number: 5SY63407
• Amperage: 40 A
• Poles: 3
• Voltage: 400 V
• Application: Circuit protection in panelboards, load centers, and electrical distribution systems
• Availability: Available from AmpState

Why this matters for retrofit and maintenance planning: choosing the exact part number ensures seamless compatibility with existing Siemens equipment, reducing downtime, avoiding unnecessary reconfiguration, and preserving original labeling and documentation. The 3-pole, 40 A design matches standard Siemens assemblies, making it a dependable choice when upgrading protection in established electrical infrastructure.

Ideal use cases you’ll appreciate:

• Retrofit projects where maintaining the original part number is critical for fit and documentation
• Ongoing maintenance programs for panelboards and distribution centers that rely on consistent Siemens components
• Strategic spare-part planning to shorten future outage windows and keep facilities running smoothly

Not sure about compatibility? Our team is ready to assist with compatibility checks and part-number confirmation to streamline your procurement and installation process.