Square D LGA36400U43X 400A 3-Pole 600 V Circuit Breaker

If you’re safeguarding a 3‑phase 600 V distribution system, the Square D LGA36400U43X delivers dependable 400 A circuit protection in a compact, 3‑pole design. This high‑capacity breaker is built to fit seamlessly into compatible Square D panels, helping you maintain safe, reliable power delivery across demanding industrial and commercial applications.

• Current rating: 400 A
• Poles: 3 (three‑phase configuration)
• Voltage rating: 600 V
• Part number: LGA36400U43X
• Brand lineage: Square D—trusted in industrial electrical systems

Why this matters for your operation

• With a 400 A capacity, this breaker shields feeders and equipment in commercial or industrial panels from overloads and short circuits that could disrupt production or cause damage.
• Purpose‑built for 600 V systems: Designed to operate within higher‑voltage distribution networks, making it a practical choice for facilities with demanding power needs.
• Easy replacement in compatible Square D panels: The LGA36400U43X is intended to slot into existing layouts, helping you minimize downtime during service or upgrades.
• Ideal for modernizing or repairing panel boards: Use it to upgrade aging protection, streamline inventory with a precise part number, and ensure consistent performance across your electrical infrastructure.

Practical use cases

• Protect large motors, conveyors, or multi‑zone feeders in manufacturing environments where 3‑phase power is standard.
• Upgrade or replace an aging panel segment to restore robust protection for critical loads in commercial facilities.
• Integrate into new installations that require a high‑amperage, three‑pole 600 V circuit breaker from a proven Square D lineage.

What you gain by choosing this specific part

• Clear, specific compatibility: Precisely matches Square D systems with the LGA36400U43X designation, reducing guesswork during procurement.
• Focused performance attributes: The combination of 400 A current rating, 3 poles, and 600 V rating addresses common industrial protection needs without over‑specifying beyond what’s required.
• Operational confidence: By selecting a manufacturer‑backed, panel‑ready component, you support safer shutdowns and consistent electrical protection in daily operations.

Installation and maintenance tips (practical, non‑vendor guidance)

• Verify that the panel and bus configuration are compatible with the LGA family and three‑pole 600 V ratings before replacement.
• Coordinate with your electrical team to ensure the 400 A rating aligns with the load served by the circuit to prevent nuisance trips during peak demand.
• Keep a labeled inventory of replacement parts by part number LGA36400U43X to simplify future maintenance and reduce downtime.