Square D LHL364001037 400A 3-Pole 600 V Circuit Breaker

Meet the Square D LHL364001037 400A 3-Pole 600 V Circuit Breaker—a purpose-built protector for demanding 3‑phase power systems. Designed to guard heavy electrical loads, this 400‑amp, three‑pole breaker disconnects all three hot legs at once, delivering reliable protection for 600‑V circuits and the equipment they power. When reliability and safety matter in industrial and commercial environments, this Square D unit stands up to the task with precision and consistency.

Key specifications at a glance

• Current rating: 400 A
• Poles: 3
• Voltage rating: 600 V
• Part number: LHL364001037
• Brand: Square D

Why a 3-pole breaker matters for your system

In any 3‑phase installation, protecting all three conductors simultaneously minimizes the risk of unbalanced loads, arc faults, and equipment damage. The LHL364001037 provides coordinated tripping across all phases, helping you maintain system safety, reduce downtime, and simplify maintenance planning in distribution panels and service equipment that rely on robust 3‑phase protection.

Ideal use cases

• Main or branch protection in industrial distribution panels supporting 3‑phase machinery
• Protection for large motors, pumps, and conveyors fed by a 600 V electrical network
• Upgrades or replacements in facilities with 400 A service requirements and 3‑phase power

What sets this Square D device apart

The LHL364001037 is more than a generic breaker. It’s a genuine Square D component, engineered to deliver dependable performance in high‑demand environments. The 400 A rating provides substantial protection for heavy loads, while the 3‑pole configuration ensures immediate, balanced shutdown of all phases in the event of an overcurrent. With a 600 V rating, it’s designed to work with modern industrial power systems, helping safeguard critical equipment and minimize the impact of electrical faults.

Practical considerations and tips

• Verify that your panel accepts LHL‑series breakers and that the form factor aligns with your Square D distribution equipment.
• Ensure proper electrical torque and secure terminal connections when installing to maintain reliable performance.
• Use as a main disconnect or a branch‑circuit protector in systems where 3‑phase, 600 V service is standard.
• Keep the part number LHL364001037 handy for ordering replacements or compatible spares to avoid compatibility issues during maintenance.

For engineers and facilities teams aiming to protect high‑current, three‑phase loads with a trusted name in electrical protection, the Square D LHL364001037 400A 3‑Pole 600 V Circuit Breaker delivers clear, measurable value—clarity, reliability, and a solid path to safer, more resilient power distribution.