Square D | MEF436LIG | Circuit Breaker | 400A | 3-Pole | 600V

Protect your three-phase power with precision using the Square D MEF436LIG circuit breaker. This 400 A, 3-pole unit is engineered for demanding industrial and commercial environments, delivering reliable interruption protection at up to 600 V. Ideal for maintenance, retrofit, and replacement projects where exact specifications matter, it plugs into compatible Square D panels to keep critical loads safeguarded without guesswork.

Specifications at a glance

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

What makes the MEF436LIG stand out

• Direct compatibility reference: The part number MEF436LIG is your best reference for ensuring a proper fit in Square D panels.
• Three-phase protection: 3-pole design aligns with common 3-phase feeders, supporting reliable coordination in industrial electrical systems.
• High-voltage capability: Rated for up to 600 V, making it suitable for challenging distribution environments.
• Retrofit-ready: Designed to slot into existing installations with matching specs, helping you minimize downtime during upgrades or replacements.

Ideal use cases

• Maintenance outages on heavy-load feeders that require a dependable, rated replacement.
• Retrofits to upgrade legacy panels or expand capacity in commercial facilities and light-industrial spaces.
• Replacement for aging or failed breakers in 3-phase distribution systems where stability and predictability are essential.

Compatibility and installation tips

Notes: Confirm fit and ratings before ordering. The MEF436LIG is the best reference for compatibility, so cross-check this part number against your panel model and service requirements. When verifying fit, consider:

• Panel compatibility with 400 A, 3-pole, 600 V specifications
• Bus design and mounting orientation to ensure a secure, compliant installation
• Any required labeling or documentation to reflect the new breaker in your electrical system

If your project requires a proven Square D solution with a precise match to your existing equipment, the MEF436LIG delivers dependable protection and straightforward installation. Verify the fit using the part number as your compatibility guide, then proceed with confidence.