Square D ME436LIG 400A 3-Pole 600 V Circuit Breaker

Engineered for demanding three-phase power distribution, the Square D ME436LIG 400A 3-Pole 600 V Circuit Breaker delivers reliable overload and short-circuit protection for industrial and large commercial panels. Its 400 A current rating paired with a 3-pole configuration ensures all phases trip together, preserving system safety and minimizing downtime during faults. With a 600 V rating, it is designed to protect line conductors and equipment in high-voltage distribution networks while contributing to smoother maintenance and service transitions.

Key benefits that matter in real-world setups

• 3-pole design for synchronized protection — simultaneous disconnection across all phases enhances safety and reduces the risk of phase imbalance during faults.
• 400 A continuous current rating — robust protection for large feeders and heavy machinery common in industrial settings.
• 600 V maximum system voltage — suitable for a wide range of three-phase distribution networks, including commercial and industrial installations.
• Part number ME436LIG — a dedicated Square D solution designed to integrate with Square D panels and components for dependable performance and straightforward replacement.
• Rugged, molded-case construction — built to withstand demanding environments typical of manufacturing floors and service entrances.

Ideal applications

• Main feeders and service disconnects in large commercial facilities and manufacturing plants
• Protection for heavy machinery and conveyors powered by three-phase 480–600 V systems
• Panel upgrades or replacements where a high-current, three-pole breaker is required

Why choose this Square D breaker

As a trusted name in electrical protection, Square D breakers are known for consistent performance and compatibility with a broad ecosystem of Square D distribution equipment. The ME436LIG combines a high current rating with a straightforward, three-pole architecture, making it a practical, long-term solution for safeguarding critical loads while simplifying maintenance and replacement in existing panels.

Practical notes and installation readiness

Designed to integrate with Square D distribution systems, this 400 A, 3-pole, 600 V circuit breaker is a pragmatic choice for upgrading capacity or replacing worn-out units in established installations. Ensure your panel rating aligns with a 400 A, three-phase protection scheme and verify mounting compatibility with ME-series molded-case breakers for a seamless fit and reliable operation.

Secure reliable, phase-balanced protection for your high-demand electrical infrastructure with the Square D ME436LIG 400A 3-Pole 600 V Circuit Breaker—where safety, performance, and ease of replacement meet in a single, dependable solution.