Siemens HHJD63B400NLNAV 400A 3-Pole 600 V Circuit Breaker

Siemens HHJD63B400NLNAV is a high-capacity 400 A, 3-pole circuit breaker engineered for demanding industrial electrical systems. With a 600 V rating, this unit provides reliable three‑phase protection for large feeders, motor circuits, and switchgear in commercial and industrial environments. Built to integrate seamlessly within Siemens panelboards and protection ecosystems, it helps ensure consistent performance across your distribution network.

• Current rating: 400 A
• Poles: 3 (three‑pole configuration)
• Voltage rating: 600 V
• Part number: HHJD63B400NLNAV
• Configuration: 3‑pole three‑phase protection
• Compatibility: Designed to work with Siemens panelboards and switchgear for consistent trip characteristics

This breaker is ideal for main protection in large feeders and heavy equipment installations. Use it to safeguard three‑phase distribution circuits in manufacturing lines, data centers, and other facilities that rely on robust, uninterrupted power delivery. As a replacement part, it matches the Siemens protection philosophy, helping maintain system coordination and reliability without compromising performance.

Why choose this Siemens unit? It provides a dependable, tech‑aligned solution within the Siemens protection family, ensuring predictable response in fault conditions and straightforward integration with existing Siemens components. The HHJD63B400NLNAV designation identifies a precise replacement that preserves compatibility with your current panel layout and wiring schemes.

Practical considerations for installation and use:

• Verify compatibility with your Siemens panel or switchgear before installation.
• Adhere to local electrical codes and Siemens installation guidelines for torque and electrical connections.
• Plan for proper de-energization and safe handling when replacing an existing unit.
• Keep the part number handy for procurement and maintenance records to ensure correct, consistent performance.