MD63B700L - 700A Circuit Breaker

MD63B700L - 700A Circuit Breaker

When it comes to finding a replacement for the MD63B700L circuit breaker, it's not just about picking another 700 amp breaker off the shelf. This model is a 700-amp, 3-pole molded-case circuit breaker with a thermal-magnetic trip unit. It has a voltage rating of up to 600VAC, with impressive interrupting ratings of 25kAIC at 600V and 50kAIC at 480V.

If you’re working with older or existing electrical setups, the MD63B700L is a solid replacement option. Just make sure that all the key factors align—like the MD frame, amperage, pole count, voltage, interrupting ratings, trip type, lug configuration, conductor range, and physical dimensions. Matching these elements ensures the replacement fits seamlessly into your application and performs reliably.

Key Features and Benefits

• 700 Amp, 3-Pole Breaker: Clearly defined electrical configuration makes it easier to compare the MD63B700L with the breaker being replaced.
• Thermal-Magnetic Trip Unit: Uses the specified thermal-magnetic trip configuration for this MD-frame breaker.
• 600VAC Rating: The breaker is rated for 600VAC, an essential specification to confirm when selecting a replacement.
• Line and Load Lugs Included: The MD63B700L includes TA3K500 lugs on both the line and load sides.
• Cu/Al Conductor Compatibility: The supplied lugs have a specified wire range of 1/0 AWG–500 kcmil for copper or aluminum conductors.
• Standard 40°C MD Frame: Product specifications identify this as a standard 40°C MD-frame breaker with standard breaking capacity.

Technical Specifications

• Catalog Number: MD63B700L
  
• Article Number: US2\:MD63B700L
  
• Product Type: Molded Case Circuit Breaker
  
• Product Family: MD6, 25KAIC, 600VAC
  
• Frame: MD
  
• Amperes: 700A
  
• Poles: 3
  
• Voltage Rating: 600VAC
  
• A.I.C. Rating at 600V: 25kAIC
  
• A.I.C. Rating at 480V: 50kAIC
  
• Trip Type: Thermal-Magnetic
  
• Temperature Rating: Standard 40°C breaker
  
• Breaking Capacity: Standard breaking capacity
  
• Included Lugs: Line- and load-side lugs
  
• 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
  
• Net Weight: 61.619 lb.
  
• UPC: 783643011748
  
• Country of Origin: Mexico
  

Material Compliance and Certifications

The supplied product documentation states that the MD63B700L meets UL 489 and IEC 60947-2 standards. Consider those standards alongside the electrical and physical specifications when a particular installation has defined compliance requirements.

Where It Works Best

The MD63B700L is best considered for compatible existing or legacy electrical equipment that requires a 700 amp, 3-pole MD-frame molded case circuit breaker with thermal-magnetic operation. A proper electrical match should account for the 600VAC rating and the required interrupting capacity. This model carries published ratings of 25kAIC at 600V and 50kAIC at 480V.

Connection details also deserve a close look. The MD63B700L is assembled with TA3K500 line- and load-side lugs, specified for 1/0 AWG through 500 kcmil copper or aluminum conductors. That makes the lug arrangement and conductor range important parts of the compatibility check—not details to assume simply because the amperage and frame match.