Square D | LHL36400MB | Circuit Breaker | 400A | 3-Pole | 600V

Experience dependable protection for high-demand electrical systems with the Square D LHL36400MB Circuit Breaker. This 400A, 3-pole device is rated for up to 600V, making it a robust choice for three-phase feeders in industrial and commercial installations. Engineered for maintenance, retrofit, and replacement projects, it slots into compatible Square D panels to restore safe, reliable power interruption when faults occur.

Designed to support demanding applications, the LHL36400MB delivers precise interruption for heavy loads while preserving panel reliability and downstream equipment. The three-pole design ensures coordinated switching across all phases, helping prevent unbalanced faults and safeguarding motors, transformers, and distribution circuits.

Key specifications and compatibility

• Amperage: 400A
• Poles: 3-Pole
• Voltage: 600V
• Part number: LHL36400MB – best reference for compatibility
• Application: maintenance, retrofit, and replacement in compatible Square D panels
• Fit guidance: Confirm fit and ratings before ordering; the part number is the most reliable reference for matching your panel

Practical use cases

• Industrial facilities upgrading feeder protection in 600V three-phase distributions
• Maintenance and retrofit projects where a precise 400A, three-pole solution is required
• Replacement for aging or incompatible breakers in existing Square D electrical panels

Why choose Square D for this application? The LHL36400MB is built to integrate with standard Square D/Schneider Electric panel architectures, ensuring consistent bus alignment and predictable performance. By selecting the exact part number, you minimize compatibility risk and reduce downtime during replacements, so your critical equipment—motors, pumps, and drives—keeps running with minimal interruption.