MD63B800 - 800Amp Circuit Breaker

MD63B800 - 800Amp Circuit Breaker

An 800 amp circuit breaker replacement has several details that need to line up before the part number alone tells you much. The MD63B800 is an 800A, 3-pole MD6 molded case circuit breaker with a thermal-magnetic trip unit and a 600VAC rating. When the frame, electrical ratings, trip configuration, lug arrangement, conductor requirements, and dimensions correspond with the application, the MD63B800 can be considered a form, fit, and functional replacement candidate. Its solid molded-case construction is built to last when selected, installed, and maintained correctly.

Key Features and Benefits

• 800A, 3-Pole Configuration: The MD63B800 provides the specified 800 amp rating in a three-pole MD-frame configuration.
• Thermal-Magnetic Trip Unit: Uses the thermal-magnetic trip configuration specified for this breaker.
• 600VAC Rating: Rated for applications requiring a 600VAC voltage rating.
• Load Lugs Included: TA3K500 lugs are provided on the load sides, an important detail when matching an existing installation.
• Wide Specified Conductor Range: The included lugs accept 1/0 AWG–500 kcmil copper or aluminum conductors.
• Standard 40°C Breaker: Identified as a standard 40°C MD-frame breaker with standard breaking capacity.

Technical Specifications

• Catalog Number: MD63B800
  
• Article Number: US2\:MD63B800
  
• Product Type: Molded Case Circuit Breaker
  
• Product Family: MD6, 25KAIC, 600VAC
  
• Frame: MD
  
• Trip Unit: Thermal-Magnetic
  
• Amperes: 800A
  
• 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
  
• Breaking Capacity: Standard breaking capacity
  
• Lugs: Load-side lugs included
  
• Lug Type: TA3K500
  
• 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
  
• UPC: 783643214484
  
• Country of Origin: Mexico
  
• Manufacturer-Listed Net Weight: 0.022 lb
  

Material Compliance and Certifications

The supplied product information states that the MD63B800 meets UL 489 and IEC 60947-2 standards. For electrical equipment, it's important to keep these documented standards separate from assumptions, especially when a replacement application has specific compliance requirements.

The included TA3K500 load-side lugs have a stated conductor range of 1/0 AWG through 500 kcmil and are specified for copper or aluminum (Cu/Al) conductors.

Where It Works Best

The MD63B800 is suited to replacement evaluation in compatible existing or legacy electrical equipment that calls for an 800A, 3-pole MD6/MD-frame molded case circuit breaker with a thermal-magnetic trip unit and 600VAC rating.

Start with the electrical requirements. The application should correspond with the MD63B800's 25kAIC rating at 600V or 50kAIC rating at 480V, as applicable. Then check the physical installation. The breaker measures 9"W x 16"H x 6"D, and it comes with TA3K500 load-side lugs accepting 1/0 AWG–500 kcmil Cu/Al conductors.