Square D | LGF36400CU31X | Circuit Breaker | 400A | 3-Pole

When your three‑phase system needs robust, dependable protection, the Square D LGF36400CU31X circuit breaker stands up to the job. This 400A, 3-pole device is designed for high-load environments and is ideal for maintenance, retrofit, or replacement projects where exact compatibility matters.

Key specifications

• Amperage: 400A
• Poles: 3‑Pole

Why this Square D breaker stands out

• The LGF36400CU31X is identified by its specific part number, making it the best reference for matching panels and ensuring reliable, consistent protection across all three phases.
• High-capacity protection: With a 400A rating, this breaker is built to shield large loads and demanding equipment from overcurrent scenarios in commercial or industrial settings.
• Versatile installation context: Designed for maintenance, retrofit, and replacement, it provides a practical, drop-in solution when upgrading or refreshing a panel that requires a 3‑pole, high‑ampere device.

Ideal use cases

Use the Square D LGF36400CU31X in three-phase distribution panels where a 400A, 3-pole breaker is required. It’s well-suited for upgrading legacy hardware during facility retrofits, performing scheduled maintenance without compromising protection, or replacing a worn‑out unit with an exact, compatible match.

How to verify compatibility

Before ordering, confirm fit and ratings with your panel’s catalog. Rely on the LGF36400CU31X part number as the primary reference to guarantee compatibility and uninterrupted protection for your electrical system.

Installation and safety note

Follow local electrical codes and consult a licensed electrician when installing or replacing circuit breakers. Ensure power is fully disconnected and equipment is de‑energized before any service to avoid hazards.