Siemens | LD63B400 | Circuit Breaker | 400A | 3-Pole | 600V

The Siemens LD63B400 circuit breaker stands as a rugged, reliable solution for industrial and commercial power protection. Designed for 600V systems, this 400A, 3-pole breaker delivers solid overcurrent protection for feeders, panels, and main distribution locations, making it an ideal choice for retrofit, maintenance, or replacement projects where exact specifications matter.

Exact compatibility you can trust

When precision matters, the LD63B400 is your reference point. Use the part number LD63B400 as the primary compatibility check to ensure a seamless fit with your Siemens panels or compatible switchgear. This is especially important during maintenance or retrofit projects where matching amperage, pole count, and voltage are critical for safe, compliant operation.

Key specifications at a glance

• Amperage: 400A
• Poles: 3-Pole
• Voltage rating: 600V

Ideal use cases

• Retrofit and upgrade projects in manufacturing floors, data centers, and large facilities where 600V distribution is standard
• Replacement for aging breakers in Siemens-based switchgear and panels
• Protection for heavy feeders and critical equipment in 400A circuits

Why it matters for your operation

Choosing the LD63B400 means aligning with Siemens’ trusted engineering and long-term reliability. A properly matched 400A, 3-pole breaker helps prevent nuisance trips, reduces downtime, and safeguards motors, transformers, and feeders from overcurrent events. By sticking to the exact spec, you preserve panel integrity, maintain proper clearance and coordination, and keep maintenance workflows efficient.

Practical tips for installation and optimization

• Always confirm fit and ratings before ordering—the LD63B400’s part number is your best compatibility reference
• Have a licensed electrician perform installation in accordance with NEC, local codes, and manufacturer instructions
• Inspect the panel labeling and ensure the breaker’s trip curve and interrupting rating align with your protection strategy
• Label the replacement clearly in your electrical log for future maintenance and audits
• Store and handle breakers in a clean, dry environment to maintain performance until installation

For projects requiring precise, durable overcurrent protection in 600V systems, the Siemens LD63B400 400A 3-pole circuit breaker provides a dependable, standards-aligned solution. Use the part number to verify compatibility, plan your retrofit or replacement with confidence, and keep your electrical infrastructure running smoothly.