Square D | MEF436LSG | Circuit Breaker | 400A | 3-Pole | 600V

Square D MEF436LSG circuit breaker is a rugged, industrial-grade protection device designed for high-demand electrical systems. With a 400A rating, 3-pole configuration, and a 600V operating range, this breaker is built to handle significant load while safeguarding equipment and personnel. It’s ideal for maintenance, retrofit, and replacement projects where exact specifications matter, ensuring reliable performance in demanding environments.

Key specifications you’ll rely on

• Amperage: 400A
• Poles: 3-Pole
• Voltage rating: 600V
• Best compatibility reference: MEF436LSG (part number)
• Ordering note: Confirm fit and ratings before purchasing

Why this exact part matters

• Exact-match replacement: Using the MEF436LSG part number minimizes the risk of mismatches in existing Square D panels and gear, reducing downtime and installation delays.
• Trusted protection for demanding loads: A 400A capacity supports substantial electrical demands while maintaining reliable circuit protection.
• Streamlined sourcing: Rely on the precise part number to guide procurement and ensure seamless compatibility with your current system.

Practical use cases

• Retrofits: Upgrading aging panels to current protection standards with a compatible, no-surprise replacement.
• Maintenance: Replacing worn or tripped components in established Square D installations to restore expected performance.
• New installations: Projects that require a 600V, three-pole protection device with clear, specifications-aligned references.

Heads-up for buyers: This part is intended for professional installation. Always verify the fit and ratings against your panel documentation and system requirements before purchasing to ensure a smooth, code-compliant setup.