Square D | LAL3640036M1021 | Circuit Breaker | 400A | 3-Pole | 600V

Meet the Square D LAL3640036M1021 circuit breaker — a robust, OEM-grade protection device designed for reliability in demanding electrical systems. With a 400A capacity and a 3-pole configuration at 600V, it's built to handle the power needs of industrial panels and commercial installations where safety and uptime matter most.

Key features and why it matters:

• Part number: LAL3640036M1021 — use this exact reference to verify compatibility with your Square D panel or switchgear.
• Amperage: 400A — suitable for main or feeder protection in medium- to heavy-duty applications.
• Poles: 3-pole design for three-phase circuits, ensuring coordinated protection across all phases.
• Voltage rating: 600V — designed for commercial/industrial systems, delivering reliable interruption capacity where required.
• Fit and compatibility notes: Confirm fit and ratings before ordering; the part number is the best reference for compatibility with your panel.

Typical use cases:

• New installations in industrial control panels or large commercial electrical rooms that require a precise 3-pole 400A, 600V breaker.
• Maintenance or retrofit of legacy Square D panels where a direct part replacement is requested to minimize downtime.
• Spare or replacement unit for service reliability in facilities with high power demand, such as manufacturing lines or data centers relying on stable power distribution.

What makes this breaker stand out:

• Authentic Square D component designed to integrate with Square D panels and accessories, reducing the risk of fitment issues common with generic substitutes.
• Direct part reference reduces compatibility checks and cross-referencing during procurement, speeding up maintenance cycles.
• Clear, unambiguous ratings (400A, 3-pole, 600V) help you plan ahead for load calculations and safety margins in your electrical design.

Practical tips:

• Always verify the panel labeling and service requirements align with 400A, 3-pole, 600V before purchase.
• Keep the exact part number handy when ordering or requesting quotes to avoid substitutes that don’t match your panel’s topology.
• If you’re replacing failing units in a multi-breaker assembly, ensure the replacement maintains the same trip characteristics to preserve coordinated protection across the panel.