Square D LRA36400U43X 400A 3-Pole 600 V Circuit Breaker

Meet the Square D LRA36400U43X — a purpose-built protector for demanding industrial and commercial electrical systems. This 400 A, 3-pole circuit breaker delivers dependable overcurrent protection at up to 600 V, making it a precise, reliable choice for safeguarding large feeders, three-phase equipment, and critical motor loads. With the exact part number LRA36400U43X, you can trust a perfect fit in compatible Square D panels and enclosures.

• Current rating: 400 A — robust protection for high-load feeders and heavy-duty circuits
• Poles: 3 — designed for three-phase systems, ensuring coordinated interruption across all phases
• Voltage rating: 600 V — suitable for industrial distribution networks and commercial applications
• Part number: LRA36400U43X — guarantees exact replacement compatibility within Square D installations
• Brand reliability: Square D’s lineage of safety and dependable performance in electrical protection

Why this model stands out in real-world setups: it’s built to handle the complexities of large facilities where dependable trip performance across three phases is non-negotiable. Whether you’re protecting feeders feeding HVAC, processing equipment, conveyors, or power distribution panels, this 400 A, 3-pole device helps ensure quick and controlled shutoffs when faults occur, reducing risk to both equipment and personnel.

Ideal use cases

• Interrupting faults on three-phase feeders feeding motors and heavy machinery in manufacturing facilities
• Providing main overcurrent protection for commercial or industrial panelboards that require 600 V ratings
• Serving as a dedicated protection device for critical three-phase power distribution in large industrial spaces

Practical notes for installation and compatibility: ensure the breaker is used in a compatible Square D panel or enclosure that supports the LRA36400U43X family, and follow standard electrical practices for torque and termination. This part is intended for professionals performing precise, code-compliant replacements and upgrades in systems where reliability and exact fit are essential.

Choosing the Square D LRA36400U43X means pairing a high-capacity, three-phase protection solution with the peace of mind that comes from a recognized brand. If your installation requires a 400 A, 3-pole device rated for up to 600 V, this part delivers the performance and compatibility you need to keep large electrical networks safe and operating smoothly.