Square D LA36400MT 400A 3P 600V Circuit Breaker | AmpState

Introducing the Square D LA36400MT 400A 3P 600V circuit breaker—a dependable protection solution for panelboards, load centers, and electrical distribution setups. Built to meet the demands of demanding commercial and industrial environments, this breaker contributes to safer, more reliable power management across your distributed circuits.

The LA36400MT is engineered for robust three-pole protection, delivering a 400 A amperage rating at up to 600 V. This configuration helps ensure balanced protection across three-phase systems, enabling precise fault isolation and smoother operation of large feeders and subfeeds within your electrical distribution network.

Why this breaker stands out

• Consistent part-number compatibility: Ideal for retrofit work and ongoing maintenance where the part number must stay the same, simplifying inventory and installation decisions.
• Three-pole protection: Designed to guard 3-phase circuits, improving coordination and protecting equipment across all phases in commercial and industrial panels.
• High-current capability: A 400 A rating supports sizable feeders, reducing the need for multiple smaller breakers and streamlining panel configuration.
• 600 V distribution readiness: Suitable for industrial power systems and distribution panels operating at up to 600 volts, aligning with common installation standards.
• Trusted source and availability: Available from AmpState, with support to help you confirm fit and ensure proper installation in your existing gear.

Practical use cases

- Retrofit projects where maintaining an exact part number is essential to avoid compatibility issues during panel upgrades or expansions.

- Maintenance planning for aging or upgrading facilities such as manufacturing floors, large office campuses, or data-center environments that rely on reliable 3-phase protection.

- New installations or expansions that leverage Square D distribution gear, ensuring consistent protection strategies and easier future serviceability.

Specifications at a glance

Manufacturer: Square D

Part number: LA36400MT

Product type: Circuit Breaker

Amperage: 400 A

Poles: 3

Voltage: 600 V

Availability: AmpState

Need help matching a part number or confirming compatibility? Message us and we’ll help you confirm fit.