Square D | MXF36400 | Circuit Breaker | 400A | 3-Pole | 600V

Meet the Square D MXF36400 circuit breaker—a rugged, high-capacity protective device engineered for reliability in demanding electrical environments. This 400A, 3-pole unit delivers secure protection for three-phase circuits and is tailored for maintenance, retrofit, and replacement projects where exact specifications matter.

• Amperage: 400A
• Poles: 3-Pole
• Voltage: 600V

Why choose MXF36400 for your next project

• Exact fit for replacement and retrofit: Designed to match the MXF36400 specification, making it the best reference for compatibility when upgrading or restoring protection in existing Square D panels.
• Three-phase protection with a 3-pole design, ideal for modern commercial and industrial systems that run on three-phase power.
• High-current capability—400A protection helps safeguard feeders and main conductors against overloads while keeping system downtime to a minimum.
• Broad voltage range suitable for 600V applications, aligning with many industrial electrical distributions and panel configurations.

Ideal use cases and scenarios

• Maintenance: replace aging or failing breakers in established Square D panels to restore reliable protection without changing surrounding circuitry.
• Retrofit: upgrade legacy installations to a robust 400A, 3-pole 600V solution when load demands increase or when panel specifications require exact MXF36400 compatibility.
• Replacement: have a genuine MXF36400 on hand for quick, precise substitution during routine service or emergency repair, reducing installation guesswork.

Practical considerations to ensure a smooth fit

• Always verify fit and ratings before ordering, using the MXF36400 part number as the compatibility reference.
• Check panel labeling to confirm that a 3-pole, 600V, 400A device is supported by your enclosure and bus assembly.
• Handle and install according to standard electrical practices and manufacturer guidelines to maintain safety and compliance.

Designed for reliability, backed by the Square D heritage, and targeted to professionals who need a precise, dependable 400A, 3-pole, 600V circuit breaker. When compatibility and performance are non-negotiable, MXF36400 stands out as the clear choice for maintenance, retrofit, and replacement projects.