Square D LA36400 - 400 A, 600 V, 3-Pole Plug-In Circuit Breaker | AmpState

The Square D LA36400 is a robust 400A, 600V, 3-pole plug-in molded case circuit breaker designed to deliver dependable branch circuit overcurrent and short-circuit protection in panelboards and load centers. Its fast plug-in connection makes installation and field replacement quick and straightforward, reducing downtime during maintenance or upgrades.

• Fast plug-in connection enables rapid installation and easy replacements, minimizing panel downtime.
• Thermal-magnetic trip unit provides stable, repeatable protection across a wide range of load conditions, automatically responding to overloads and short circuits.
• 3-pole design supports three-phase distribution, ideal for commercial and light industrial electrical systems.
• 600V electrical rating broadens compatibility with medium-voltage panel environments and higher-demand circuits.
• 400A continuous capacity suited for main feeders and large branch circuits within panelboards and load centers.
• OEM-compatible specifically engineered to pair with matching Square D OEM load centers and panelboards for reliable fit and performance.
• Versatile applications suitable for residential, commercial, and light industrial environments where robust three-phase protection is required.

What makes this breaker stand out is its combination of a plug-in form factor, a reliable thermal-magnetic trip mechanism, and deliberate compatibility with Square D panel ecosystems. This means faster upgrades, simpler maintenance, and consistent protection across your distribution system without sacrificing performance.

Technical snapshot

• Square D
• LA36400
• Thermal-magnetic molded case circuit breaker
• 400A
• 600V
• 3
• Plug-in
• Branch circuit overcurrent and short-circuit protection

Practical tips for installation and use

Ensure full compatibility with your OEM load center or panelboard before installation. The LA36400 is designed for quick plug-in connection, so verify that your enclosure supports a 3-pole, 400A plug-in unit. In three-phase systems, this breaker helps protect main feeders and large circuits from overloads and short circuits, supporting safer operation in busy electrical rooms. For best results, schedule installation through a qualified electrician and follow all applicable electrical codes and safety guidelines.