LD63B350 - 350Amp Circuit Breaker

LD63B350 - 350Amp Circuit Breaker

When you're replacing a breaker in existing equipment, the details have to match—not just the amp rating. The LD63B350 is a 350A, 3-pole LD frame molded case circuit breaker with a thermal-magnetic trip unit and a 600V rating. For existing or legacy equipment built around the LD frame, the LD63B350 can be a suitable form, fit, and functional replacement when the electrical ratings, connections, dimensions, and equipment requirements all match. Properly selected, installed, and used within its specified ratings, it's built to last in the application it was designed for.

Key Features and Benefits

• 350A, 3-pole configuration for equipment requiring these specific ratings
• 600V rated
• Thermal-magnetic trip unit
• LD frame design
• Standard 40°C breaker rating
• TA2J6500 line and load lugs are included
• Accepts 3/0 AWG–500 kcmil copper conductors
• Accepts 4/0 AWG–500 kcmil aluminum conductors
  

Technical Specifications

• Catalog Number: LD63B350
  
• Article Number: US2\:LD63B350
  
• Product Type: Molded Case Circuit Breaker
  
• Frame: LD
  
• Trip Unit: Thermal-Magnetic
  
• Amperage: 350A
  
• Poles: 3
  
• Voltage: 600V
  
• Interrupting Capacity at 600V: 25kA
  
• Interrupting Capacity at 480V: 35kA
  
• Temperature Rating: 40°C
  
• Load-Side Lugs: TA2J6500, included
  
• Copper Wire Range: 3/0 AWG–500 kcmil
  
• Aluminum Wire Range: 4/0 AWG–500 kcmil
  
• Dimensions: 7.5"W x 11"H x 4"D
  
• Net Weight: 20.238 lb
  
• Country of Origin: Mexico
  

Material Compliance and Certifications

The supplied manufacturer information identifies the LD63B350 as meeting UL 489 and IEC 60947-2 standards.

Where It Works Best

The LD63B350 makes the most sense when the equipment already calls for a 350A, 3-pole LD frame breaker and you're trying to maintain the original electrical and physical configuration. That's particularly relevant with existing and legacy systems, where changing one specification can create compatibility issues elsewhere.