Square D | LE36400LSG | Circuit Breaker | 400A | 3-Pole | 600V | Plug-In

The Square D LE36400LSG is a purpose-built 400A, 3-pole, 600V plug-in circuit breaker designed for dependable protection in demanding electrical systems. Built for maintenance, retrofit, and replacement projects, this unit slots into compatible Square D panels with ease, helping you maintain reliable power delivery and quick serviceability when issues arise.

• Amperage: 400A
• Poles: 3-Pole (three-phase)
• Voltage rating: 600V
• Type: Plug-In circuit breaker
• Brand & model: Square D LE36400LSG
• Compatibility note: The part number is the most reliable reference for fitting and ratings—confirm fit before ordering.

What this means for your installation

Designed for three-phase systems, this 400A plug-in breaker is ideal for protecting feeders and equipment in commercial or light industrial applications operating at up to 600V. Its plug-in form factor enables faster swaps and easier field service compared with bolt-on variants, minimizing downtime during maintenance or retrofits.

Ideal use cases

• Maintenance replacements in existing Square D panels that accept plug-in breakers
• Retrofit upgrades where higher current capacity is required for 3-phase circuits
• Replacement of a failed 3-pole 600V breaker in industrial or commercial electrical rooms

Why choose this Square D breaker

Choosing a device with a proven track record from Square D helps ensure consistent performance, reliable tripping behavior, and straightforward compatibility with your panel lineup. The LE36400LSG is specifically referenced by its part number, which remains the clearest guide for matching ratings and physical fit in compatible plug-in panels.

Practical guidance for installation and selection

Before ordering, verify that your panel accepts plug-in breakers of this form factor and that the 400A, 3-pole, 600V ratings align with your load requirements. Keeping the part number (LE36400LSG) handy as the compatibility reference streamlines ordering and reduces the risk of mismatches during maintenance or upgrades.