Square D | LA36400MB | Circuit Breaker | 400A | 3-Pole | 600V

The Square D LA36400MB circuit breaker is a rugged, three-pole protection device designed for demanding industrial and commercial electrical systems. With a 400A rating and a 600V operating range, it provides reliable protection for three-phase feeders in compatible distribution panels. Built for maintenance, retrofit, and replacement projects, this unit is the precise choice when specs matter and downtime is costly.

• Amperage: 400A
• Poles: 3-Pole (three-phase)
• Voltage: 600V
• Part number: LA36400MB
• Best use: maintenance, retrofit, and replacement in panels that accept LA-series breakers
• Compatibility tip: Confirm fit and ratings before ordering—the LA36400MB part number is the most reliable reference for compatibility.

Who benefits most: facility engineers, electrical contractors, and maintenance teams who manage mid-to-large scale distribution panels in manufacturing, commercial buildings, or data-center environments. When a panel requires a precise 400A, 3-pole, 600V device, the LA36400MB delivers a straightforward, drop-in solution that minimizes guesswork and installation time.

Functional insights and practical notes:

• Designed to protect three-phase circuits from overloads and short circuits, helping maintain critical equipment uptime.
• Ideal for retrofitting older panels to modern protection standards without changing downstream wiring or panel hardware.
• Use this part number to ensure you’re selecting a genuine Square D component, preserving panel ratings and manufacturer compatibility.
• Before purchase, audit panel labeling and service requirements to confirm that a 400A, 3-pole, 600V device aligns with your system’s specifications.

Choosing this model means leaning into the reliability of Square D for robust electrical protection in applications where precise matching matters. If your project calls for a 400A, 3-pole, 600V breaker with a clear, verifiable part reference, the LA36400MB is designed to meet those exacting criteria and keep your electrical distribution running smoothly.