Siemens J6N3R 400A Circuit Breaker, NEMA 3R | AmpState

The Siemens J6N3R is a purpose-built circuit breaker designed to provide dependable protection in panelboards, load centers, and electrical distribution systems. With a robust 400 A rating and a NEMA 3R enclosure, this device is engineered for reliability in both indoor spaces and weather-protected outdoor environments.

• Manufacturer: Siemens
• Part Number: J6N3R
• Amperage: 400 A
• Enclosure rating: NEMA 3R (weather-resistant for outdoor or harsh environments)
• Applications: suitable for panelboards, load centers, and electrical distribution networks
• Availability: Available from AmpState

What makes the J6N3R stand out is its exact part-number fidelity combined with Siemens’ trusted engineering. This isn’t a generic protection device—it's a precise match for projects that demand a direct part-number fit, reducing installation risk and inventory mismatches in maintenance or panel-building workflows.

Key benefits and use cases

• Outdoor-ready protection for outdoor cabinets, weather-exposed installations, and resilient electrical distribution layouts thanks to the NEMA 3R rating.
• Ideal for maintenance teams and panel builders who require a guaranteed direct part-number match to keep projects on schedule and spare inventories lean.
• Supports high-load distribution with 400 A capacity, helping to safeguard feeders, service entrances, and critical circuits without compromising performance.
• Reliable sourcing from AmpState ensures consistent availability, critical for planning, stocking, and quick replacements during outages or routine maintenance.

Why this matters in practical terms: choosing the J6N3R reduces the guesswork in procurement, accelerates commissioning, and minimizes downtime when a direct Siemens part is specified in project documentation. It’s a straightforward solution for professionals who value compatibility, durability, and clear sourcing paths.

Compatibility and support

If you need help matching a part number or confirming compatibility with your panelboard, load center, or distribution configuration, message AmpState. Our team can verify fit and ensure the J6N3R is the right choice for your system.

Equip your electrical distribution with a dependable Siemens circuit breaker that aligns with project specs and stock availability. The J6N3R delivers clear value through precise matching, robust protection, and ready access from AmpState—a practical, no-nonsense choice for engineers, electricians, and maintenance professionals alike.