Square D LGA36400U31X - 400A, 600VAC, 3-Pole, Circuit Breaker

The Square D LGA36400U31X is a rugged 400A, 600VAC, 3-pole circuit breaker engineered to deliver dependable overcurrent protection in demanding electrical environments. Designed for use in panelboards, switchboards, and control panels, it provides solid, reliable performance where uptime and safe operation are critical.

Key specifications

• Current rating: 400A
• Voltage rating: 600VAC
• Poles: 3-Pole
• Breaker type: Circuit Breaker
• Configuration: 3-phase protection suitable for three-phase power distribution
• Applications: Panelboards, switchboards, and control panels in industrial, commercial, and OEM settings

Why this model stands out

• Heavy-duty protection for large feeders: With a 400A rating and 600VAC capability, it safeguards high-current circuits feeding motors, drives, and other critical equipment.
• Versatile three-pole design: Optimized for three-phase systems, ensuring coordinated protection across all phases in distribution panels and motor control centers.
• Proven Square D reliability: Built to perform in environments where electrical protection must act fast to prevent equipment damage and unexpected downtime.

Ideal use cases

• Industrial and commercial panelboards where large feeders require robust overcurrent protection
• Switchboards and motor control centers that serve multi-motor applications
• OEM equipment where a dependable 3-pole breaker is part of the standard electrical protection scheme

What problems it helps you solve

• Prevents damage from overloads and short circuits on three-phase circuits
• Reduces unplanned downtime by protecting essential power distribution paths
• Supports safe operation in high-current electrical installations with a compact, reliable form factor

Practical deployment tips

• Ensure compatibility with your panelboard, switchboard, or control panel’s mounting and terminations for a seamless retrofit or new-build installation
• Pair with appropriate wiring and disconnect strategies to maintain clear isolation and safe maintenance practices
• Regularly inspect for signs of wear or overheating in high-load environments to maintain optimal protection performance