Square D | LGA36400U44X | Circuit Breaker | 400A | 600V | 35kA | Plug-In

Square D LGA36400U44X Circuit Breaker is a robust, plug-in protection device designed for reliable service in demanding electrical systems. With a 400 A rating, 600 V maximum, and a 35 kA interrupting capacity, this breaker is built to handle high-current loads and clear faults quickly, helping protect both equipment and personnel.

Whether you’re performing maintenance, retrofitting an existing installation, or replacing a failed unit, the LGA36400U44X delivers a dependable plug-in solution that slides into compatible Square D panels with minimal downtime. The plug-in design means faster swaps and less panel downtime—important for industrial environments where every minute counts.

• Amperage: 400 A continuous current to protect large circuits and heavy equipment.
• Voltage rating: Up to 600 V, suitable for typical medium- to high-voltage industrial systems.
• Interrupting capacity: 35 kA, providing a high level of protection against short-circuit faults.
• Installation: Plug-in style for streamlined replacement in compatible Square D panels.
• Compatibility reference: Part number LGA36400U44X is the best guide for matching fit and ratings.

Why this model stands out

Unlike generic replacements, this Square D unit is purpose-built for Square D panels and ecosystems. Its combination of high current capacity, voltage tolerance, and a strong fault-interruption rating makes it well-suited for demanding applications where reliability and rapid service restoration matter most—such as manufacturing lines, data centers, and commercial power distribution centers.

Ideal use cases

• Maintenance replacements in existing Square D installations
• Retrofits to upgrade protection in aging panels
• Spare/backup breaker for emergency readiness in critical facilities
• New builds that require a proven, plug-in 400 A protection device

Compatibility and installation tips

Always confirm fit and ratings before ordering. The part number LGA36400U44X serves as the primary compatibility reference, so cross-check it against your panel model and bus design. For installation, ensure the panel supports plug-in breakers of this style and follow standard safety procedures for electrical work. If your system operates near the upper limits of voltage or fault current, this unit’s 35 kA interrupt rating provides a robust margin of protection.

Choosing the Square D LGA36400U44X means opting for a trusted, purpose-built solution designed to maintain electrical safety and minimize downtime in demanding environments. This is the go-to replacement for professionals who require precise specifications, reliable performance, and straightforward installation in their Square D-powered frameworks.