Square D | LLA36400CU31X | Circuit Breaker | 400A | 3-Pole | 600V

Introducing the Square D LLA36400CU31X Circuit Breaker—built for industrial reliability and straightforward retrofits. This 400A, 3-pole device is rated for up to 600V, making it a solid choice for protecting three-phase power distribution in demanding environments.

Key advantages:

• Exact-fit compatibility: The part number LLA36400CU31X is your best reference when matching original equipment, ensuring a seamless replacement or upgrade without panel modifications.
• Powerful protection for three-phase circuits: With a 400A rating and a 3-pole configuration, it provides coordinated protection across all three phases, helping prevent equipment damage and downtime.
• High-voltage capability: Designed for systems up to 600V, making it suitable for industrial feeders and motor drives in a range of facilities.
• Maintenance, retrofit, and replacement ready: Ideal for maintenance schedules, retrofits, and replacements where precise specifications are required to maintain electrical safety and system performance.

Practical guidance for use:

• Verify fit and ratings before ordering: Use the official part number to confirm compatibility with your panel and electrical system.
• Plan for three-phase protection: Ensure your panel and downstream equipment are configured for 3-pole protection at 600V to maintain proper coordination.
• Install following OEM procedures: Adhere to manufacturer instructions and applicable electrical codes for safe, reliable operation.

Who benefits most from this Square D circuit breaker? facilities with heavy three-phase loads, data centers, manufacturing lines, and large motors that require robust protection and easy replacement with an exact spec match. If you’re upgrading an older system or performing a retrofit, this unit helps you maintain consistent electrical performance without surprises.