Square D LA34400MC 400A 3-Pole 480 V Circuit Breaker

Meet the Square D LA34400MC 400A 3-Pole 480 V Circuit Breaker—a rugged protective device designed for demanding 3-phase power systems. With a 400 A current rating, three poles, and a 480 V maximum rating, this breaker provides reliable interruption to safeguard feeders and critical equipment in industrial and large commercial facilities. The LA34400MC part number identifies the exact unit, ensuring precise ordering and compatibility within Square D installations.

Key specifications at a glance

• Current rating: 400 A
• Poles: 3 (three-pole protection for 3-phase systems)
• Voltage rating: 480 V
• Part number: LA34400MC
• Brand: Square D

Why this model stands out

The LA34400MC leverages a three-pole design to simultaneously interrupt all phases in a 480 V three-phase circuit. This synchronized shutoff helps minimize fault conditions, reduce arc exposure, and protect downstream motors, transformers, and feeders from damaging overloads or short circuits. Built for high-current scenarios, it’s a practical solution for facilities that rely on robust, dependable circuit protection in industrial environments.

Ideal use cases

• Industrial facilities and large commercial setups with 480 V three-phase service
• Heavy feeders supplying large motors, conveyors, or HVAC installations
• Electrical service upgrades or replacements where a 400 A, 3-pole, 480 V breaker is specified

Installation and practical considerations

For safe and compliant setup, have a licensed electrician install the LA34400MC and verify it meets local electrical codes. Confirm that the device is the correct part for your panel or switchgear configuration by referencing the Part Number LA34400MC. Reserve this breaker for applications that require reliable protection at 400 A on a 480 V three-phase system.

What customers gain

With the Square D LA34400MC, you’re choosing a purpose-built, three-pole solution that aligns with high-current, 480 V service needs. It offers clear identification with the exact part number, straightforward procurement, and a focused feature set that helps protect essential equipment and maintain uptime in demanding environments.