Square D LCL36400 - 400 A, 600 V, 3-Pole Circuit Breaker | AmpState

The Square D LCL36400 is a robust 400 A, 600 V, 3-pole molded case circuit breaker designed to deliver reliable branch circuit overcurrent and short-circuit protection in panelboards and load centers. Built for dedicated protection, it pairs a compact molded case design with a thermal-magnetic trip unit to provide stable, repeatable performance when it matters most.

Key specifications at a glance

• Manufacturer: Square D
• Part number: LCL36400
• 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

Why this breaker stands out

• Space-efficient design: The compact molded case form maximizes panel space, making it easier to fit into existing panelboards and load centers without sacrificing protection.
• Thermal-magnetic protection: The trip unit combines thermal and magnetic sensing to deliver precise, dependable protection, reducing nuisance trips while responding quickly to true faults.
• OEM compatibility: Specifically designed to be compatible with matching Square D OEM load centers and panelboards, simplifying replacement and upgrades and preserving system integrity.
• Versatile for multiple environments: Suitable for residential, commercial, and light industrial applications where robust protection of large branch circuits is required.

Ideal applications and use cases

Use the Square D LCL36400 in panelboards and load centers where a 400 A, 3-pole device is appropriate. It’s an excellent choice for safeguarding essential branch circuits in residential multi-family panels, commercial office environments, and light industrial electrical panels. Its dependable thermal-magnetic trip ensures a predictable response to overloads and short circuits, helping protect wiring, devices, and downstream equipment.

Installation tips and practical insights

• Verify that your panelboard or load center is rated for 600 V and supports a 3-pole device of 400 A to ensure proper fit and protection performance.
• Pair this MCCB with the matching OEM enclosure to maintain electrical coordination and warranty continuity.
• Plan panel layout to accommodate the compact size without obstructing adjacent meters or feeders, aiming for clear labeling of protected circuits.
• Regularly inspect for signs of wear or overheating on terminations and ensure torque is within manufacturer guidelines during installation.

Engineered to deliver dependable protection where it matters, the Square D LCL36400 combines a space-conscious design, precise thermal-magnetic trip behavior, and OEM-aligned compatibility to empower safer, more reliable electrical systems across residential, commercial, and light industrial settings.