Square D LGL36400U31X - 400 A, 600 V, 3-Pole Circuit Breaker | AmpState

The Square D LGL36400U31X is a rugged, high-capacity solution designed to safeguard your electrical distribution. With a 400 A rating, 600 V maximum voltage, and a 3-pole configuration, this molded case circuit breaker is built for dependable branch circuit overcurrent and short-circuit protection in panelboards and load centers.

• Compact molded case design optimizes panel space, letting you fit more protection in tight electrical enclosures without sacrificing reliability.
• Thermal-magnetic trip unit delivers stable, repeatable protection performance across varying fault conditions, helping to prevent nuisance tripping while still providing fast fault clearance when it matters.
• OEM-compatible designed to be used with matching OEM load centers and panelboards, ensuring a reliable fit, electrical continuity, and streamlined maintenance.
• Versatile application suitable for residential, commercial, and light industrial environments where robust protection and space efficiency are priorities.
• High-capacity protection 400 A current rating with a 600 V rating makes this unit appropriate for demanding distribution circuits and larger panelboard applications.

Why this 3-pole unit matters for your electrical system

Three-pole protection is essential for any three-phase distribution or equipment fed from a three-phase service. The LGL36400U31X combines a compact form factor with a dependable thermal-magnetic trip mechanism, delivering precise trip characteristics and clear fault indication. This means fewer unexpected shutdowns and more consistent uptime for critical loads in commercial spaces or industrial light-duty environments.

Ideal use cases

• Feeding main distribution panels in small to mid-size commercial facilities where space is at a premium.
• Protecting branch circuits in light industrial installations that require reliable three-phase protection.
• Upgrading or replacing aging breakers within OEM-compatible panelboards to maintain performance and compatibility.

Installation, compatibility, and practical considerations

To maximize performance and safety, pair the Square D LGL36400U31X with matching OEM load centers and panelboards. Confirm that the buses, trip unit type, and mounting arrangement align with your panel’s specifications. When integrating this unit, follow standard electrical safety practices, and consult your panelboard’s installation guide for proper torque and wiring conventions.

Designed for durability and long-term reliability, this 3-pole breaker is an excellent choice for professionals who value precise protection, modular panel design, and straightforward serviceability in residential, commercial, and light industrial settings.