Square D LC36400 - 400A, 3-Pole, Circuit Breaker

Meet the Square D LC36400 — a rugged 400A, 3-pole circuit breaker engineered for demanding electrical systems. Ideal for industrial, commercial, and OEM applications, it delivers dependable overcurrent protection in distribution panels, switchboards, and motor control centers, helping to keep critical equipment safe and productive.

What makes the LC36400 stand out

• High-capacity protection: 400 A current rating provides robust protection for large feeders and motor loads.
• Three-pole configuration: Three-phase (3-Pole) design delivers balanced protection across all phases, simplifying control of motors and three‑phase equipment.
• Versatile installation: Suitable for panelboards, switchboards, and control panels, enabling flexible integration in new builds or retrofits.
• Reliable overcurrent protection: Built for long service in demanding environments where safety and uptime matter.

Who benefits from this circuit breaker

Engineers, panel builders, OEMs, and facilities teams working with large electrical distributions will appreciate the LC36400 for its ability to protect heavy-duty equipment while keeping installation straightforward. It's an ideal choice for motor control centers and distribution panels in manufacturing plants, processing facilities, and commercial complexes with high-load demands.

Use cases and scenarios

• Retrofit or upgrade projects in existing panelboards and switchboards where a 3-pole, 400A protection strategy is required.
• New motor control centers where three-phase protection and centralized fault isolation reduce downtime.
• Industrial feeders supplying large motors, conveyors, pumps, or HVAC systems that demand reliable current limiting.

Practical tips for installation and maintenance

• Verify compatibility with your existing Square D panels and the LC36400 family to ensure proper fit and electrical coordination.
• Coordinate with upstream protections and fusing to establish a consistent protection scheme across your distribution network.
• Schedule regular inspections for physical integrity and signs of wear or overheating in the enclosure and surrounding wiring.

Choose the Square D LC36400 when you need serious, scalable protection for 3-phase systems. It's a solid foundation for safe, dependable power distribution in high-demand environments.