Square D LDA36400U31X PowerPact MCCB – 3 Pole – 400A – 600V – I-Line Plug-In – Electronic Trip Unit (LSI) – Molded Case Circuit Breaker

The Schneider Electric / Square D LDA36400U31X is a PowerPact LDA-series molded case circuit breaker (MCCB) designed for high-performance industrial power distribution and protection. It is built for reliable protection of three-phase electrical systems, offering advanced electronic trip functionality and high interrupting capacity for demanding commercial and industrial applications.

Electrical Ratings

• Frame / Line Rated Current: 400 A
• Rated Current (Breaker): 400 A
• Voltage Rating: up to 600 V AC
• Phase: 3 Phase
• Poles: 3 Pole
• Interrupting Capacity: 18 kA @ 480 V AC
• Continuous Current Rating: 80%
• Utilization: Power distribution and motor protection

Protection and Trip Functions

• Trip Unit Technology: Electronic (MicroLogic 3.3 / standard LI)
• Protection Functions:
  • Long-Time Protection (Overload)
  • Short-Time Protection
  • Instantaneous Protection
• Protection Type: Solid-state electronic
• Control Type: Toggle
• Breaking Capacity Code: D

Configuration and Function

• Device Type: Molded Case Circuit Breaker (MCCB)
• Series: PowerPact LDA
• Mounting Type: I-Line Style Plug-In (Bracket Mount)
• Electrical Connection: I-Line line connection / lugs load side
• Application Type: Industrial power distribution, feeder protection, and motor circuits

Mechanical and Physical Characteristics

• Dimensions (H × W × D): 13.39 in × 5.51 in × 4.33 in
• Weight: 13.67 lbs
• Trip Unit: Non-interchangeable MicroLogic 3.3
• Wire Range: AWG 3/0 to 500 kcmil (Al/Cu)
• Mounting Mode: I-Line bracket system
• Compact industrial MCCB frame design

Standards and Certifications

• UL Listed / CSA Approved
• Designed for industrial and commercial electrical systems
• Manufacturer: Schneider Electric / Square D
• Family: PowerPact LDA Series

Features

• High-capacity 400A molded case breaker for industrial systems
• Advanced electronic LSI protection for precise fault handling
• 18 kA interrupting rating at 480V for reliable short-circuit protection
• I-Line plug-in design for fast installation and replacement
• Suitable for feeders, distribution panels, and motor protection
• Compact yet heavy-duty industrial construction
• Solid-state MicroLogic 3.3 trip unit for accurate performance
• High conductor flexibility (Al/Cu supported)
• Designed for long-term reliability in harsh electrical environments