MD63B500 - 500Amp Circuit Breaker

MD63B500 - 500Amp Circuit Breaker

When your existing electrical system calls for a specific 500 amp, 3-pole breaker, getting the details right matters. The MD63B500 is an MD6 frame molded case circuit breaker with a thermal-magnetic trip unit, rated for 600VAC and supplied with load-side lugs. For existing or legacy equipment that requires these electrical ratings, dimensions, conductor provisions, and MD6 configuration, the MD63B500 can be considered a form, fit, and functional replacement candidate after application compatibility is confirmed. Its solid molded-case construction is built to last when selected, installed, and maintained correctly.

Key Features and Benefits

• 500A, 3-Pole Configuration: Clearly defined amperage and pole count make comparison with an existing breaker straightforward.
• 600VAC Rating: Rated for applications requiring a maximum specified voltage of 600VAC.
• Thermal-Magnetic Trip Unit: Uses the specified thermal-magnetic trip configuration for the MD63B500.
• Load Lugs Included: The breaker includes TA3K500 lugs on the load sides, so you don't need to assume the terminal configuration from the catalog number alone.
• Copper or Aluminum Conductors: The supplied lug specification covers 1/0 AWG–500 kcmil Cu/Al, helping with conductor compatibility checks.

Technical Specifications

• Catalog Number: MD63B500
  
• Article Number: US2\:MD63B500
  
• Product Type: Molded Case Circuit Breaker
  
• Product Family: MD6, 25KAIC, 600VAC
  
• Frame: MD
  
• Trip Unit: Thermal-Magnetic
  
• Amperes: 500A
  
• Poles: 3
  
• Voltage Rating: 600VAC
  
• A.I.C. Rating at 600V: 25kAIC
  
• A.I.C. Rating at 480V: 50kAIC
  
• Temperature Rating: Standard 40°C breaker
  
• Lugs: Load-side TA3K500 lugs included
  
• Wire Range: 1/0 AWG–500 kcmil
  
• Conductor Compatibility: Copper/Aluminum (Cu/Al)
  
• Width: 9 in.
  
• Height: 16 in.
  
• Depth: 6 in.
  
• Dimensions: 9"W x 16"H x 6"D
  
• Net Weight: 56.879 lbs.
  
• UPC: 783643214453
  
• Country of Origin: Mexico
  

Material Compliance and Certifications

The supplied manufacturer information states that the MD63B500 meets UL 489 and IEC 60947-2 standards. These details are particularly useful when evaluating a circuit breaker for an application where specified standards must be confirmed rather than assumed.

Where It Works Best

The MD63B500 is best considered when maintaining compatible existing or legacy electrical equipment that requires a 500A, 3-pole MD6/MD frame molded case circuit breaker with thermal-magnetic operation and a 600VAC rating.