Square D LA36400 - 400A, 3-Pole, Circuit Breaker

Meet the Square D LA36400—a rugged 400A, 3-pole circuit breaker designed to safeguard your most critical electrical infrastructure. Built for industrial reliability, this unit delivers dependable overcurrent protection in panelboards, switchboards, and control panels where uninterrupted performance matters.

The 3-pole configuration ensures all three phases disconnect together, delivering balanced protection for three-phase feeders and dramatically reducing the risk of phase imbalance that can damage motors and downstream equipment. With a robust 400A current rating, the LA36400 is well-suited for high‑demand distribution circuits found in commercial facilities, manufacturing environments, and OEM applications where strong, decisive protection is essential.

Key advantages

• Current rating: 400A—capable of handling heavy feeders without frequent trips
• Poles: 3-Pole configuration for true three-phase protection
• Protection type: Overcurrent protection to guard against overloads and short circuits
• Application versatility: Ideal for panelboards, switchboards, and motor control centers
• Reliability: Backed by Square D’s reputation for durable, dependable electrical protection
• OEM-friendly: Suitable for integration into equipment and customized distribution applications

Ideal use cases and who benefits

• Facilities engineers upgrading power distribution in manufacturing floors, warehouses, and large offices
• Electrical contractors provisioning new builds or retrofits for robust three-phase protection
• OEMs incorporating heavy-duty circuit protection into machinery and control systems
• Panel and MCC designers seeking reliable, easy-to-specify protection for high-current feeders

Why choose the Square D LA36400 in practice

Compared with lower-current or single‑phase breakers, the LA36400 provides coordinated, three‑phase protection essential for safe operation of motors and other heavy loads. Its robust construction is designed to endure the rigors of industrial environments, while its straightforward installation and clear labeling simplify field maintenance and replacement in distribution panels and control centers.

Practical setup tips

• Verify compatibility with your panelboard, switchboard, or MCC configuration and bus arrangement before installation
• Confirm wiring method and torque specifications per the panel manufacturer’s guidelines to ensure secure, reliable connections
• Use on-hand spares of the LA36400 for quick field replacements, minimizing downtime during maintenance
• Label the breaker clearly to reflect its 400A, 3‑pole function for future service and safety audits