LD63B400 - 400Amp Circuit Breaker

LD63B400 - 400Amp Circuit Breaker

For equipment that calls for a 400A, 3-pole LD frame breaker, the LD63B400 provides specific ratings and connection details to match your existing installation. For maintenance of existing or legacy equipment, it can serve as a form-, fit-, and functional replacement when the frame, electrical ratings, connections, dimensions, and installation requirements match the equipment being serviced. Properly selected, installed, and operated within its specified ratings, the LD63B400 is built to last in its intended application.

Key Features and Benefits

• 400A rated current with a 3-pole configuration
• LD frame molded case circuit breaker
• Thermal-magnetic trip unit
• Rated for 600V
• Standard 40°C breaker rating
• TA2J6500 lugs included on the load sides
• Accommodates 3/0 AWG–500 kcmil copper conductors
• Accommodates 4/0 AWG–500 kcmil aluminum conductors
  

Technical Specifications

• Catalog Number: LD63B400
  
• Article Number: US2:LD63B400
  
• Product Type: Molded Case Circuit Breaker
  
• Frame: LD
  
• Trip Unit: Thermal-Magnetic
  
• Amperage: 400A
  
• Poles: 3
  
• Voltage Rating: 600V
  
• AIC at 600V: 25kA
  
• AIC at 480V: 35kA
  
• Temperature Rating: 40°C
  
• Load-Side Lugs: TA2J6500, included
  
• Copper Conductor Range: 3/0 AWG–500 kcmil
  
• Aluminum Conductor Range: 4/0 AWG–500 kcmil
  
• Dimensions: 7.5"W x 11"H x 4"D
  
• Net Weight: 19.268 lb
  
• Country of Origin: Mexico
  

Material Compliance and Certifications

The supplied manufacturer specifications state that the LD63B400 meets UL 489 and IEC 60947-2 standards.

Where It Works Best

Consider the LD63B400 when you're maintaining existing or legacy equipment designed for a 400A, 3-pole LD frame thermal-magnetic breaker. Here, compatibility comes down to several details working together.

Check the electrical side first. The breaker carries a 25kA rating at 600V and 35kA at 480V. Whichever voltage applies to the installation, its corresponding interrupting rating must meet the system and available fault-current requirements.