Square D LX36400G - 400 A, 3-Pole Plug-In Circuit Breaker | AmpState

The Square D LX36400G is a 400 A, 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 streamlines installation and replacement, reducing downtime when you’re upgrading or servicing electrical distribution.

With a thermal-magnetic trip unit, this breaker provides stable, repeatable protection against overloads and short circuits. The 3-pole design ensures simultaneous disconnection of all three phases, which is essential for balanced operation of large motors and multi‑wire branch circuits in three-phase systems. Built to work with matching OEM load centers and panelboards, it delivers reliable coordination and electrical compatibility across square D installations.

Ideal for residential, commercial, and light industrial applications, the LX36400G is a robust choice for service upgrades, retrofit projects, or new builds that demand a high-capacity, plug-in breaker. Use cases include protecting large feeders, supplying heavy machinery, or safeguarding high‑demand circuits in multi‑unit buildings where uptime and safety are paramount.

• Plug-in connection enables quick installation and easy replacement in compatible panelboards and loadcenters.
• Thermal-magnetic trip provides reliable overload and short-circuit protection with consistent trip performance.
• 3-pole design ensures simultaneous disconnection of all phases for safe, coordinated protection.
• 400 A rating supports high-demand branch circuits and large equipment loads.
• OEM-compatible construction guarantees proper fit and electrical coordination with Square D panelboards and load centers.

Technical specifications

• Manufacturer: Square D
• Part Number: LX36400G
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 400 A
• Number of Poles: 3
• Mounting Style: Plug-in
• Application: Branch circuit overcurrent and short-circuit protection

If you’re upgrading an existing Square D system or outfitting a new installation, the LX36400G 400 A 3-pole plug-in breaker offers rapid, reliable protection with a design and compatibility pedigree you can trust. Pair it with your OEM panelboard for optimal performance, safety, and longevity in your electrical distribution network.