Square D LI36400 - 400 A, 3-Pole Plug-In Circuit Breaker | AmpState

Meet the Square D LI36400 – a 400A, 3-pole plug-in molded case circuit breaker engineered for dependable branch circuit protection in panelboards and load centers. Built for fast installation and straightforward replacements, this unit keeps electrical systems running smoothly in busy spaces—from homes to commercial offices and light industrial environments.

Why this breaker stands out

• Fast plug-in connection for quick installation and easy replacement in dense panel layouts, minimizing downtime during service or upgrades.
• Thermal-magnetic trip unit delivers stable, repeatable protection against overcurrent and short circuits, adapting to varying load conditions for consistent performance.
• 400A, 3-pole configuration provides robust protection for high-current branch circuits and multi-wire panelboard setups.
• OEM-compatible design is specifically meant to work with matching Square D load centers and panelboards, ensuring proper fit, electrical coordination, and reliable operation.
• Molded-case construction offers rugged durability suitable for residential, commercial, and light industrial applications, with clear labeling for straightforward servicing.

Specifications at a glance

• Manufacturer: Square D
• Part Number: LI36400
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 400A
• Number of Poles: 3
• Mounting Style: Plug-in
• Application: Branch circuit overcurrent and short-circuit protection

Ideal use scenarios

Designed for a range of applications, this LI36400 is well-suited to protecting large residential service panels, commercial office spaces, light industrial panels, and equipment rooms where high-current reliability matters. It’s a practical replacement option when upgrading or expanding panel capacity, or when upgrading to a compatible plug-in solution that preserves existing panelboard architecture.

Practical considerations and tips

• Choose the LI36400 when your system requires a direct plug-in fit with Square D panelboards and load centers to maintain precise trip coordination and protection margins.
• During installation, ensure the power is de-energized and verify the panel’s compatibility with a 3-pole, 400A plug-in breaker to avoid mismatches.
• Consider spare units for quick field replacement to reduce downtime during maintenance windows in commercial or industrial environments.

Secure the Square D LI36400 400A, 3-pole plug-in breaker for reliable, high-current protection that aligns with your OEM panels and supports smooth, uninterrupted operation in residential, commercial, and light industrial settings. AmpState makes it available for fast, dependable sourcing when uptime matters.