Square D | LAL34400MC1212 | Circuit Breaker | 400A | 3-Pole | 480V

Square D introduces the LAL34400MC1212 circuit breaker—a precisely matched, high-capacity protective device designed for demanding 480V three‑phase systems. With a robust 400A rating across 3 poles, this breaker is built to safeguard critical industrial circuits while maintaining reliable power delivery in busy electrical rooms and distribution panels.

• Amperage: 400A
• Poles: 3-Pole
• Voltage: 480V
• Part number: LAL34400MC1212
• Brand lineage: Square D

Why this model stands out in practical terms:

• Exact compatibility for maintenance and retrofit: The part number LAL34400MC1212 is the strongest reference for matching ratings and fit, reducing guesswork during repairs or upgrades.
• Designed for three-phase 480V systems: Ideal for industrial power distribution where three-phase feeders require solid overcurrent protection and clear isolation points.
• Reliability in replacements: Use it to replace a worn or failed unit without compromising existing protection schemes or panel coordination.

Use cases and scenarios to consider:

• Maintenance swaps: Quick, field-proven replacement for aging breakers to minimize downtime after a fault or routine inspection.
• Retrofit projects: Update legacy panels with a contemporary, compatible 400A 3‑pole solution that preserves safety margins and circuit protection.
• New or refurbished installations: Configure feeders and main lugs in 480V systems where a precise 400A, 3-pole protection device is required.

Practical guidance for ordering and installation:

• Verify fit and ratings first: Before purchasing, confirm that the LAL34400MC1212 aligns with your panel model, bus configuration, and intended load.
• Use the part number as the primary compatibility cue: Rely on LAL34400MC1212 to ensure the unit will drop into the same footprint and deliver the same protection characteristics as the original.

In short, this Square D circuit breaker is a purpose-built choice for professionals managing 480V, three-phase distributions. Its 400A capacity, 3-pole arrangement, and exact part-number compatibility make it a dependable, straightforward solution for maintenance, retrofit, and replacement projects without compromising system protection.