Square D LGL36400U33X - 400 A, 600 V, 3-Pole Circuit Breaker | AmpState

Meet the Square D LGL36400U33X, a high-capacity 400 A, 600 V, 3-pole molded case circuit breaker engineered for reliable branch circuit protection in panelboards and loadcenters. Built to shield equipment and wiring from overloads and short circuits, this breaker delivers precise protection where it counts most—from service entrances to subpanels in demanding environments.

• Compact molded case design minimizes space usage in crowded panel cabinets, helping you maximize every square inch of panel real estate.
• Thermal-magnetic trip unit provides stable, repeatable protection by accurately sensing both overloads and fault currents, reducing nuisance trips and improving reliability.
• 3-pole configuration ideal for three-phase systems or multi-pole protection in complex panel layouts, enhancing system safety across loads.
• OEM-compatible integration designed to work seamlessly with matching Square D OEM loadcenters and panelboards for straightforward installation and dependable performance.
• High-current, wide-voltage rating 400 A at 600 V, making it suitable for residential, commercial, and light industrial applications where robust protection is required.

Why this breaker matters for your electrical system

In any electrical installation, reliable overcurrent and short-circuit protection is critical. The LGL36400U33X’s thermal-magnetic trip technology ensures protection levels stay consistent across varying electrical conditions, so your panelboard responds promptly to faults while minimizing unnecessary trips during normal operation. Its sturdy molded case design is built to endure in harsh environments, reducing maintenance concerns over time.

Technical snapshot

• Manufacturer: Square D
• Part Number: LGL36400U33X
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 400 A
• Voltage Rating: 600 V
• Number of Poles: 3
• Application: Branch circuit overcurrent and short-circuit protection

Ideal use cases

• Main feeder protection in panelboards and loadcenters for commercial buildings and light industrial facilities
• Subpanel protection in larger residential or mixed-use installations requiring high-current capability
• Upgrading old protection schemes to a reliable, OEM-compatible solution with consistent trip characteristics

With the Square D LGL36400U33X, you gain a purpose-built, high-current protective device that integrates smoothly into compatible panel systems, delivers dependable performance under demanding loads, and helps keep electrical infrastructure safe and compliant over the long term.