Square D | MX36400G | Circuit Breaker | 400A | 3-Pole | 600V

The Square D MX36400G circuit breaker delivers industrial-grade protection for 600-volt electrical systems with a clear focus on reliability, retrofit simplicity, and long-term performance. Engineered as a 400 A, 3-pole device, it’s built to handle demanding load conditions while fitting neatly into compatible Square D panel configurations.

Key specifications

• Amperage: 400 A
• Poles: 3-Pole
• Voltage: 600 V
• Part reference: MX36400G
• Intended use: maintenance, retrofit, and replacement in compatible panels

What makes it stand out

• Direct compatibility with Square D panels that accept MX36400G, simplifying replacements and minimizing installation adjustments.
• Robust protection for high-demand 600V feeders, helping prevent overloads and short circuits in critical electrical infrastructure.
• Compact design that fits dense panel layouts without compromising interrupting capabilities for 400 A circuits.

Why you should consider this model

Whether you’re upgrading existing equipment, performing routine maintenance, or replacing end-of-life breakers, choosing the exact part MX36400G ensures proper coordination with your panel and system. The product notes emphasize confirming fit and ratings before ordering, a crucial step to avoid downtime and ensure safe operation.

Use cases and practical guidance

• Ideal for service entrances and distribution panels in facilities operating 600V electrical distributions.
• Excellent for retrofit projects where a like-for-like replacement preserves panel characteristics and protective coordination.
• Suitable for environments that require dependable, predictable performance under heavy load conditions.

Notes: Confirm fit and ratings before ordering. The MX36400G part number is the best reference for compatibility, ensuring your protection device aligns with your panel and meets your electrical system’s safety standards.