LD63B400L - 400Amp Circuit Breaker

LD63B400L - 400Amp Circuit Breaker

The LD63B400L is a 400-amp, 3-pole molded-case circuit breaker designed for equipment using the LD frame configuration. If you're maintaining older equipment built around an LD frame breaker, the LD63B400L gives you a well-documented set of specifications to match. When correctly selected, installed, and operated within those ratings, it's built to last in the application it was designed for.

Key Features and Benefits

• 400A, 3-pole breaker for equipment requiring this specific configuration
• 600V rating
• Thermal-magnetic trip unit
• LD frame construction
• Standard 40°C rating
• TA2J6500 line- and load-side lugs included
• Accepts 3/0 AWG–500 kcmil copper conductors
• Accepts 4/0 AWG–500 kcmil aluminum conductors
  

Technical Specifications

• Catalog Number: LD63B400L
  
• Article Number: US2:LD63B400L
  
• Device Type: Molded Case Circuit Breaker
  
• Frame: LD
  
• Trip Type: Thermal-Magnetic
  
• Amperage: 400A
  
• 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 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: 19.533 lb
  
• Country of Origin: Mexico
  

Material Compliance and Certifications

• UL 489
• IEC 60947-2
• REACH: The manufacturer references information related to REACH Article 33; the supplied data does not state blanket REACH compliance
• WEEE: Manufacturer information references WEEE (2012/19/EU) take-back obligations
  

Where It Works Best

The LD63B400L is most relevant when you're repairing or maintaining equipment that was designed around a 400A, 3-pole LD frame breaker. That's where a careful spec-for-spec comparison pays off.

Start with the electrical side. The breaker is rated 25 kA at 600V and 35 kA at 480V. Use the rating that applies to the system, and confirm it meets the available fault current and equipment requirements.