Square D ME36400LS - 400A, 600VAC, Circuit Breaker

Introducing the Square D ME36400LS — a purpose-built 400A, 600VAC circuit breaker designed for serious electrical protection in demanding environments. Whether you're building out a distribution panel, upgrading a motor control center, or integrating into OEM equipment, this breaker delivers reliable overcurrent protection when it matters most.

Key benefits

• High current capability: 400 A continuous rating for heavy-load feeders and motor circuits.
• High-voltage readiness: Designed for systems up to 600 VAC, supporting commercial and industrial power distribution.
• Versatile installation: Compatible with panelboards, switchboards, control panels, and OEM assemblies — ideal for retrofit and new builds.
• Robust protection in harsh environments: Built to endure the rigors of industrial settings while maintaining precise protection characteristics.
• Streamlined maintenance: Simple replacement within existing Square D protection schemes, minimizing downtime.

Why this matters for your operation

In distribution panels and motor control centers, a single overcurrent event can impact production, equipment, and safety. The ME36400LS provides dependable fault protection at a scale that matches large equipment and high-power drives, helping you prevent damage, reduce unplanned downtime, and simplify system coordination.

Applications and use cases

• Main protection for 400 A feeders in industrial panelboards and switchboards.
• Motor control centers where large currents and short-circuit protection are critical.
• OEM equipment where a rugged, reliable 600 VAC protective device is required.
• Power distribution nodes in commercial facilities with heavy electrical loads.

Specifications at a glance

• Current rating: 400 A
• Voltage rating: up to 600 VAC
• Breaker type: Circuit Breaker

Choosing the right protective device means matching your system voltage, current demands, and installation footprint. The Square D ME36400LS pairs a high current rating with a broad voltage range, making it a practical backbone for demanding electrical distribution. If you’re updating a panel or integrating into OEM gear, this breaker helps ensure consistent, predictable protection across your power system.