LD63B350L - 350Amp Circuit Breaker

LD63B350L - 350Amp Circuit Breaker

The LD63B350L is a 350-amp, 3-pole molded case circuit breaker with an LD frame and a thermal-magnetic trip unit. Rated for 600V, it has an interrupting capacity of 25kA at 600V and 35kA at 480V. One useful detail is that you won't have to guess about the connections: TA2J6500 lugs are included on both the line and load sides. They accommodate 3/0 AWG to 500 kcmil copper or 4/0 AWG to 500 kcmil aluminum conductors. When properly selected, installed, and kept 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 electrical characteristics
• 600V rating
• Thermal-magnetic trip unit
• LD frame design
• Standard 40°C breaker rating
• TA2J6500 line- and load-side lugs are included
• Handles 3/0 AWG–500 kcmil copper conductors
• Handles 4/0 AWG–500 kcmil aluminum conductors
  

Technical Specifications

• Catalog Number: LD63B350L
  
• Article Number: US2:LD63B350L
  
• Device Type: Molded Case Circuit Breaker
  
• Frame: LD
  
• Trip Type: Thermal-Magnetic
  
• Amperage: 350A
  
• Number of Poles: 3
  
• Voltage Rating: 600V
  
• AIC at 600V: 25kA
  
• AIC at 480V: 35kA
  
• Temperature Rating: 40°C
  
• Line-Side Lugs: TA2J6500, included
  
• 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: 19.533 lb
  
• Country of Origin: Mexico
  

Material Compliance and Certifications

• UL 489
• IEC 60947-2
• REACH: The manufacturer references information concerning REACH Article 33; check current product documentation for details
• WEEE: Manufacturer information references WEEE (2012/19/EU) take-back obligations
  

Where It Works Best

The LD63B350L is a strong candidate for maintenance and replacement jobs involving equipment designed for a 350A, 3-pole LD frame breaker. This is especially useful with existing or legacy installations where changing the surrounding equipment isn't the objective—you need the replacement breaker to match the required electrical and physical configuration.

On the electrical side, first check the system voltage and available fault current. The breaker is rated 25 kA at 600V and 35 kA at 480V. The rating that applies to your system must meet the installation and equipment requirements.