Square D LLA36400U53X 400A 3-Pole 600 V Circuit Breaker

Meet the Square D LLA36400U53X 400A 3-Pole 600 V Circuit Breaker — a robust overcurrent protector designed for demanding three-phase power systems. Built to guard feeders and critical loads, this device helps keep equipment safe and your operations running smoothly in commercial and industrial environments.

• Key spec snapshot: Part number LLA36400U53X; current rating 400 A; 3-pole configuration; voltage rating 600 V.
• Three-pole protection for balanced power ensures all three phases are monitored and interrupted together, reducing phase imbalances and safeguarding motors, transformers, and other heavy-duty equipment.
• Designed for high-demand feeders— ideal for distribution panels, large HVAC systems, industrial machinery, and other setups that require reliable protection at 600 V.
• Square D compatibility— built to integrate with Square D enclosures and distribution infrastructure, making replacement and maintenance straightforward for established panels.
• Installation and safety considerations— verify conductor sizing aligns with the 400 A rating, follow torque specifications for secure terminations, and confirm the system voltage does not exceed 600 V. Regular inspection and timely replacement are key to sustained protection.

This device is particularly well-suited for facilities managers, electrical contractors, and panel builders overseeing data centers, manufacturing floors, warehouses, and large office complexes with three-phase power. When you need reliable protection against overloads and short circuits in a 600 V three-phase network, the LLA36400U53X delivers precise, durable performance without complicating maintenance.

Choose this circuit breaker to simplify spares management in existing Square D systems, ensure consistent trip performance across all phases, and maintain peace of mind for the safety and continuity of your power distribution.