Square D LDA36400U31X - 400 A, 600 V, 3-Pole Plug-In Circuit Breaker | AmpState

Meet the Square D LDA36400U31X, a 400 A, 600 V, 3-pole plug-in molded case circuit breaker from AmpState. Built for dependable branch-circuit overcurrent and short-circuit protection, it integrates fast plug-in installation with precise, thermal-magnetic protection for panelboards and load centers.

• Fast plug-in connection enables rapid installation and effortless replacement, reducing downtime during maintenance or upgrades.
• Thermal-magnetic trip unit delivers stable, repeatable protection across a range of loads and fault conditions, improving reliability on every cycle.
• OEM-compatible design pairs with matching Square D load centers and panelboards for seamless integration and dependable performance.
• Versatile 3-pole configuration supports three-phase systems common in commercial and light industrial environments, making it ideal for main feeders and distribution points.
• Rugged molded case construction provides durable protection in demanding electrical installations while maintaining a compact footprint.

Technical Specifications

• Manufacturer: Square D
• Part Number: LDA36400U31X
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 400 A
• Voltage Rating: 600 V
• Number of Poles: 3
• Mounting Style: Plug-in
• Application: Branch circuit overcurrent and short-circuit protection

Ideal Use Cases

• Upgrading or replacing aging breakers in residential, commercial, and light industrial panelboards and load centers.
• Protection of high-current main feeders in three-phase electrical distributions.
• Engineering and maintenance projects requiring quick swaps with OEM-compatible components to minimize system downtime.

Why this model stands out: the LDA36400U31X combines a robust 400 A capability with quick-connect plug-in installation and a thermal-magnetic trip mechanism that maintains reliable protection under varying load conditions. Its compatibility with Square D OEM load centers ensures not just a fit, but a trusted, long-term performance path for your electrical distribution system. If you’re designing or maintaining panelboards and load centers that demand strong, immediate protection with straightforward service, this 3-pole plug-in breaker from Square D is a practical, purpose-built choice.