Square D LLD36400CU44X 400A 3-Pole 600 V Circuit Breaker

For demanding three-phase power systems, the Square D LLD36400CU44X delivers dependable overcurrent protection at a robust 400 A. This 3-pole, 600 V circuit breaker is built to interrupt fault currents across all three phases, helping safeguard equipment and wiring in commercial and industrial electrical distributions.

• Part Number: LLD36400CU44X
• Current rating: 400 A
• Poles: 3
• Voltage rating: 600 V

Key advantages of this Square D breaker go beyond its impressive ratings. The 3-pole design provides synchronized protection across all phases in a three-phase system, which is essential for preventing imbalanced loads and protecting motors, drives, and feeders from harmful fault conditions. With a 400 A capacity, it handles high-current applications typical in mid-to-large commercial and light industrial environments, while remaining a compact, reliable solution for main feeders and distribution panels.

Ideal use scenarios

• Protection of large three-phase feeders in commercial electrical rooms and light industrial installations.
• Protection for heavy-moload motors, HVAC equipment, compressors, and other high-current loads.
• Serves as a main disconnect or primary protection device in distribution panels requiring a 400 A, 3-pole solution.

What makes the LLD36400CU44X distinctive is its clear alignment with three-phase systems needing high-current interruption at up to 600 V. It’s a purpose-built choice when you require reliable, coordinated protection across all phases without compromising space or performance. By selecting this Square D model, you’re choosing a component designed to integrate into standard electrical distributions while delivering the protection your equipment demands.

Whether you’re upgrading an existing panel, replacing a failed breaker, or designing a new distribution setup for a demanding load profile, the Square D LLD36400CU44X 400 A 3-Pole 600 V circuit breaker brings clarity of protection, straightforward applicability, and the assurance of a trusted brand in electrical safety.