LD63B450 - 450Amp Circuit Breaker

LD63B450 - 450Amp Circuit Breaker

The LD63B450 is a 450-amp, 3-pole molded-case circuit breaker for equipment using the LD frame configuration. It's also a standard 40°C breaker and meets UL 489 and IEC 60947-2 standards. When you're maintaining older equipment, that's really what matters—matching the breaker to the application rather than relying on amperage alone. When the LD63B450 matches the required frame, ratings, connections, dimensions, and equipment specifications, it can provide the needed form, fit, and function.

Key Features and Benefits

• 450A, 3-pole configuration for equipment requiring these specific ratings
• 600V rated
• Thermal-magnetic trip unit
• LD frame construction
• Standard 40°C breaker
• TA2J6500 load-side lugs included
• Handles 3/0 AWG–500 kcmil copper conductors
• Handles 4/0 AWG–500 kcmil aluminum conductors
• Well suited to form, fit, and functional replacement when all application requirements match
  

Technical Specifications

• Catalog Number: LD63B450
  
• Article Number: US2:LD63B450
  
• Device Type: Molded Case Circuit Breaker (MCCB)
  
• Frame: LD
  
• Trip Type: Thermal-Magnetic
  
• Amperage: 450A
  
• Poles: 3
  
• Voltage: 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: 20.79 lb
  
• Country of Origin: Mexico
  

Material Compliance and Certifications

• UL 489
• IEC 60947-2
• REACH: REACH Article 33 information is referenced by the manufacturer; this should not be read as a blanket REACH compliance claim
• WEEE: Manufacturer documentation references WEEE (2012/19/EU) take-back obligations
  

Where It Works Best

The LD63B450 fits replacement and maintenance jobs where existing equipment requires a 450A, 3-pole LD frame thermal-magnetic breaker with the same electrical characteristics. It's a particularly sensible match for legacy equipment where the goal isn't to change the surrounding installation, but to maintain the required form, fit, and function.

For 600V systems, this breaker is rated 25kA. At 480V, its interrupting capacity is 35kA. Make sure the applicable rating matches the available fault current and the equipment's requirements.