Square D LGA36400CU43X 400A 3-Pole 600 V Circuit Breaker

Experience robust protection with the Square D LGA36400CU43X 400A 3-Pole 600 V Circuit Breaker. Engineered for heavy‑duty 3‑phase power distribution, this unit provides reliable interruption capabilities to safeguard motors, transformers, and feeders in demanding environments.

• Current rating: 400 A
• Poles: 3 (three‑phase protection)
• Voltage rating: 600 V
• Part number: LGA36400CU43X
• Series/compatibility: LGA family, designed to fit Square D panels requiring LGA breakers

What makes this breaker stand out? Its design is tailored for high‑load applications where a 3‑pole device handles simultaneous phase protection. The 600 V rating supports industrial power systems common in manufacturing, data centers, and large commercial facilities, while the 400 A rating accommodates substantial feeder currents without compromising safety or nuisance tripping under normal load variations.

Practical use cases:

• Main service disconnect in large three‑phase distribution panels, delivering clear, centralized protection
• Feeder protection for heavy equipment banks, such as motors and compressors
• Retrofit projects where existing gear requires an LGA‑series 3‑pole, 600 V solution

Who benefits most: electrical engineers, facility managers, panel builders, and electrical contractors who need a reliable, compatible breaker that can handle sizable loads while maintaining quick‑trip protection.

Installation and compatibility tips (practical):

• Verify your panel accepts LGA‑series breakers and that the 3‑pole configuration matches your wiring plan
• Confirm the system voltage up to 600 V and ensure conductors and terminations are sized for 400 A continuous operation
• Keep documentation and the part number handy for future maintenance or panel upgrades