Square D LIL36400 - 400 A, 3-Pole Circuit Breaker | AmpState

Meet the Square D LIL36400 — a 400 A, 3-pole molded-case circuit breaker built to anchor reliable branch-circuit protection in panelboards and loadcenters. Available from AmpState, this unit is purpose-designed for residential, commercial, and light industrial installations where space, protection accuracy, and compatibility matter most.

What makes the LIL36400 stand out

• Compact molded-case design maximizes panel space without compromising protection, enabling tighter, cleaner installations in both new builds and upgrades.
• Thermal-magnetic trip unit delivers stable, repeatable protection by sensing overloads and short circuits, helping to prevent wiring damage and equipment failures.
• OEM-compatible construction engineered to be compatible with matching OEM loadcenters and panelboards, simplifying replacements and reducing compatibility concerns during upgrades.
• Three-pole configuration at 400 A ideal for 3-phase systems and higher-load panels, delivering robust protection for demanding electrical environments.

Why this breaker solves real-world problems

In busy buildings where space is at a premium, the LIL36400’s compact form factor fits where bulkier breakers can’t, while its thermal-magnetic trip unit provides dependable protection across a range of fault conditions. The 3-pole design is well-suited for 3-phase distribution, ensuring synchronized interruption across all phases and reducing the risk of uneven current draw. Its OEM compatibility means smoother replacements and streamlined maintenance, helping you keep panels serviced without costly customization.

Ideal use cases

• New or retrofit panel installations requiring a 400 A, 3-pole protector in residential, commercial, or light industrial settings.
• Replacements in compatible loadcenters and panelboards where cross-compatibility matters for warranty and serviceability.
• Projects that demand a space-efficient, high-current breaker without sacrificing precise protection or reliability.

Technical snapshot

• Manufacturer: Square D
• Part Number: LIL36400
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 400 A
• Number of Poles: 3
• Application: Branch circuit overcurrent and short-circuit protection

Choose the Square D LIL36400 when you need dependable, high-current protection with a compact footprint, proven compatibility, and a protection mechanism that stays stable under demanding conditions. It’s the smart, practical choice for safeguarding panels, wiring, and connected loads in a wide range of environments.