Square D LHP36400MB Circuit Breaker, 400A, 3-Pole, 600V

Power up your industrial protection with the Square D LHP36400MB circuit breaker. This 400 A, 3-pole, 600 V unit is built for demanding three-phase systems in manufacturing floors, data centers, and heavy machinery environments. When you need reliable protection that fits precisely, the LHP36400MB delivers.

Why this breaker stands out

Designed for industrial service, maintenance, and replacement projects, the LHP36400MB pairs Square D's proven engineering with a form factor that fits compatible panels and feeders. The 3-pole configuration provides solid three-phase protection, while the 600 V rating supports demanding industrial voltages.

• 400 A rating for robust current protection in large-capacity circuits.
• Three-pole design built for balanced feed to 3-phase equipment and motors.
• 600 V maximum operating voltage suitable for industrial distribution panels and MCCs.
• Genuine Square D part helps ensure compatibility with your existing Square D panels and catalogued replacement parts.
• Part number verification LHP36400MB is the exact identifier you should match to confirm fit; always align with your application requirements.

Ideal use cases

Use this circuit breaker in industrial service panels, feeders, and machine control circuits where a reliable 3‑phase protection device is needed. It’s well-suited for panel upgrades, performing routine maintenance, or replacing worn breakers in environments like manufacturing floors, processing plants, and heavy equipment installations. Pair it with compatible Square D switchgear to maintain system integrity and consistent trip characteristics.

Installation and compatibility tips

To ensure proper operation, verify fit by the exact part number (LHP36400MB) and review your panel or MCC catalog for compatibility. If you’re mounting in a new or existing system, coordinate with a licensed electrician or electrical engineer to confirm conductor sizing, enclosure clearance, and protective coordination with upstream devices.

With genuine Square D protection, you gain reliable performance and ready availability for service or replacement projects. If you need help confirming compatibility or finding the right fit, we’re ready to assist with part-number matching and application guidance.