Square D | LDA36400U43X | Circuit Breaker | 400A | 3-Pole | 600V | Plug-In

Meet the Square D LDA36400U43X circuit breaker—a purpose-built protective device designed for demanding electrical systems. Identified by part number LDA36400U43X, this unit is ideal for maintenance, retrofit, and replacement projects where exact specifications matter and compatibility is non-negotiable.

Key details at a glance

• Amperage: 400A
• Poles: 3-Pole
• Voltage rating: 600V
• Mounting style: Plug-In
• Compatibility reference: Part number LDA36400U43X

Why this Square D circuit breaker stands out for your panel

• Exact fit for Square D systems that require a plug-in, 3-pole 600V protection device, delivering reliable trip performance for three-phase loads.
• Plug-in design enables quicker replacements and maintenance cycles, helping minimize downtime in critical applications.
• Specifically selected for 400A protection in commercial, industrial, or data-center environments where robust electrical protection is essential.
• Part number LDA36400U43X serves as the most reliable reference for compatibility—always verify fit and ratings before ordering.

Practical use scenarios

• Maintenance: swap aging breakers to restore full protection without extensive panel modifications.
• Retrofit: upgrade to higher-capacity 400A protection in existing 3-phase installations while maintaining 600V service.
• Replacement: keep an exact, on-spec part on hand to reduce downtime when a breaker trips or fails in active service.

Notes for ordering and installation

• Before purchasing, confirm that your panel accepts a plug-in, 3-pole breaker with a 600V rating and 400A capacity.
• Rely on the part number LDA36400U43X as the most dependable compatibility reference to avoid mismatches in frame or ratings.