Square D LLA36400U44X - 400 A, 3-Pole Plug-In Circuit Breaker | AmpState

Introducing the Square D LLA36400U44X — a 400 A, 3-pole plug-in molded case circuit breaker designed to deliver dependable branch circuit overcurrent and short-circuit protection in panelboards and load centers. Its fast plug-in connection supports quick installation and easy replacements, keeping maintenance downtime to a minimum. The built-in thermal-magnetic trip unit ensures stable, repeatable protection across varying fault conditions, helping you avoid nuisance trips while maintaining safety and reliability.

• Fast plug-in connection for rapid installation and straightforward future swaps in compatible OEM panelboards.
• Thermal-magnetic trip unit delivers consistent protection performance, reacting appropriately to both short circuits and overloads.
• OEM-compatible design engineered to work with matching Square D load centers and panelboards for a proper fit and reliable operation.
• Versatile applications suited for residential, commercial, and light industrial environments where a 400 A, 3-pole breaker is required.

Technical specifications

• Manufacturer: Square D
• Part Number: LLA36400U44X
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 400 A
• Number of Poles: 3
• Mounting Style: Plug-in
• Application: Branch circuit overcurrent and short-circuit protection

Ideal use scenarios

• Main or feeder protection in large residential service panels and subpanels.
• Commercial load centers and light industrial panelboards requiring robust 400 A, 3-pole protection.
• Upgrading aging electrical distributions where fast, reliable plug-in replacements minimize downtime.

With the Square D LLA36400U44X, you get a purpose-built solution that balances installation efficiency with dependable protection. It’s crafted for installers and facility managers who value compatibility, performance, and peace of mind in high-demand electrical environments.