Square D LGA36400U31X - 400 A, 600 V, 3-Pole Plug-In Circuit Breaker | AmpState

Introducing the Square D LGA36400U31X — a rugged 400 A, 600 V, 3-pole plug-in molded case circuit breaker engineered to safeguard panelboards and load centers with dependable branch circuit overcurrent and short‑circuit protection.

• Fast plug‑in connection for quick installation and easy replacement, minimizing downtime during service or upgrades.
• Thermal‑magnetic trip unit delivers stable, repeatable protection for both sustained overloads and instantaneous short‑circuit events.
• 3‑pole design ensures synchronized protection across all phases, ideal for multi‑wire circuits and three‑phase systems.
• 400 A / 600 V rating provides robust protection for high‑demand feeders and shared circuits in commercial and light industrial environments.
• OEM‑compatible with matching Square D panelboards and load centers, ensuring a seamless, reliable protection ecosystem.
• Plug‑in molded case construction built for durability and long service life in residential, commercial, and light industrial installations.

Where it shines

Designed for reliable branch circuit overcurrent and short‑circuit protection, the LGA36400U31X is well suited for upgrading legacy panels, expanding capacity in new builds, or replacing failing breakers in existing Square D systems. It’s a practical choice for electrical rooms, data centers, retail spaces, office suites, and light manufacturing facilities that demand quick maintenance and dependable protection.

Key specifications at a glance

• Manufacturer: Square D
• Part number: LGA36400U31X
• Type: Thermal‑magnetic molded case circuit breaker
• Amperage rating: 400 A
• Voltage rating: 600 V
• Poles: 3
• Mounting style: Plug‑in
• Application: Branch circuit overcurrent and short‑circuit protection

Practical tips for installation and use

For best results, pair this breaker with a compatible Square D load center or panelboard to maintain consistent trip characteristics and mechanical fit. Before installation, verify that the panel labeling supports 400 A, 600 V, 3‑pole protection and follow standard electrical safety practices. When replacing an old breaker, ensure the new unit is the same type and rating to preserve coordinated protection across downstream devices.

Whether you’re a property manager, technician, or electrician, the Square D LGA36400U31X offers rapid, reliable protection for demanding electrical systems with a straightforward plug‑in approach that minimizes downtime and simplifies servicing.