MD63B700 - 700Amp Circuit Breaker

MD63B700 - 700Amp Circuit Breaker

When you're replacing an MD-frame breaker, the 700 amp rating is only one piece of the match. The MD63B700 is a 700 amp, 3-pole MD6 molded case circuit breaker with a thermal-magnetic trip unit, rated for 600VAC. For replacement work in compatible existing or legacy equipment, check the MD frame, 700A rating, three-pole configuration, voltage and interrupting ratings, thermal-magnetic trip, lug arrangement, conductor range, and dimensions rather than relying on the catalog number alone. When those specifications match the application, the MD63B700 can be considered a form, fit, and functional replacement candidate.

Key Features and Benefits

• 700 Amp, 3-Pole Configuration: Provides the amperage and pole arrangement needed to match compatible equipment that calls for an MD63B700 configuration.
• Thermal-Magnetic Trip Unit: The breaker uses the specified thermal-magnetic trip design for this MD-frame model.
• 600VAC Rating: Its published voltage rating makes this an important specification to verify against the existing electrical system.
• Lugs on Sides: TA3K500 includes load-side lugs, which is useful when checking a replacement.
• Defined Conductor Range: The TA3K500 lugs accommodate 1/0 AWG–500 kcmil copper or aluminum conductors.
• Standard 40°C MD Frame: Product information identifies the MD63B700 as a standard 40°C MD-frame breaker with standard breaking capacity.

Technical Specifications

• Catalog Number: MD63B700
  
• Article Number: US2\:MD63B700
  
• 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: 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
  
• UPC: 783643214477
  
• Country of Origin: Mexico
  
• Manufacturer-Listed Net Weight: 0.022 lb.
  

Material Compliance and Certifications

The supplied documentation states that the MD63B700 meets UL 489 and IEC 60947-2 standards. These are useful identifiers when a replacement application requires verification against specific breaker standards.

The supplied connection hardware consists of TA3K500 load-side lugs with a stated 1/0 AWG–500 kcmil Cu/Al wire range. No additional lug material or terminal characteristics should be assumed beyond the published information.

Where It Works Best

The MD63B700 700 amp circuit breaker is the best replacement candidate for compatible existing or legacy electrical equipment that specifically calls for an MD-frame, 3-pole molded case circuit breaker with thermal-magnetic operation. The electrical match should include 700A, 600VAC, 25kAIC at 600V, and 50kAIC at 480V.

Don't overlook the connection arrangement. The MD63B700 comes with TA3K500 lugs on both the load sides, and those lugs carry a stated conductor range of 1/0 AWG through 500 kcmil Cu/Al. If the existing installation calls for a different terminal arrangement or conductor range, resolve that difference before installation.