MD63T700 - 700Amp Trip Unit

MD63T700 - 700Amp Trip Unit

The MD63T700 is a 700 amp, 3-pole thermal-magnetic trip unit for compatible MD-frame circuit breaker equipment. One detail matters right away when you're sourcing this catalog number: the manufacturer identifies the MD63T700 as "TU ONLY," or trip unit only. Evaluate it as a replacement component, not a complete molded case circuit breaker. When application requirements align, the MD63T700 can be considered a form, fit, and functional replacement candidate for compatible existing or legacy MD-frame equipment. Its solid construction is built to last when selected, assembled, installed, and maintained correctly.

Key Features and Benefits

• 700 Amp Rating: The MD63T700 is rated at 700A, giving maintenance teams a clear starting point when matching an existing trip unit.
• Thermal-Magnetic Trip Unit: Uses the specified thermal-magnetic trip configuration for compatible MD-frame equipment.
• Made for the MD Frame: This trip unit is specifically identified for the MD breaker frame, an essential compatibility point for replacement work.
• Three-Pole Application: Specified for the associated 3-pole, 700A breaker configuration.
• Trip Unit Only: The TU ONLY designation makes clear that MD63T700 is a replacement trip unit, not a complete breaker assembly.

Technical Specifications

• Catalog Number: MD63T700
  
• Article Number: US2\:MD63T700
  
• Manufacturer Catalog Description: BREAKER MD 3P 700A 600V 25KA TU ONLY
  
• Product Type: Thermal-Magnetic Trip Unit
  
• Configuration: TU Only / Trip Unit Only
  
• Product Family: MD6, 25KAIC, 600VAC
  
• Frame: MD
  
• Amperes: 700A
  
• Poles: 3
  
• Associated Voltage Rating: 600V
  
• Associated AIC Rating at 600V: 25kAIC
  
• Associated AIC Rating at 480V: 50kAIC
  
• Trip Type: Thermal-Magnetic
  
• Breaking Capacity: Standard Breaking Capacity
  
• Net Weight: 5.9 lb
  
• UPC: 783643214835
  
• Commodity Code: 85363099
  
• Country of Origin: Mexico
  
• Associated Lug Type Referenced: TA3K500
  
• Associated Lug Position: Line and load side
  
• Associated Wire Range: 1/0 AWG–500 KCM
  
• Associated Conductor Compatibility: Copper/Aluminum (CU/AL)
  
• Associated Breaker Dimensions (W x H x D): 9 x 16 x 6 in.
  

Material Compliance and Certifications

The supplied product information states that the associated low-voltage molded case circuit breaker configuration meets UL 489 and IEC 60947-2 standards. Since MD63T700 is specifically identified as the trip unit for the MD frame, these standards should be considered in the context of the complete breaker assembly rather than represented as an independent certification of the trip unit alone.

Where It Works Best

The MD63T700 700 amp thermal-magnetic trip unit is suited to replacement and maintenance work involving compatible MD-frame electrical equipment that requires this specific trip-unit configuration. For legacy equipment in particular, the catalog number is useful, but it shouldn't be the only compatibility check.

Before using the MD63T700 as a replacement, compare the existing equipment's MD frame, 700A rating, three-pole configuration, thermal-magnetic trip requirements, voltage, and associated interrupting ratings. Because this product is a trip unit only, you must also consider the condition and compatibility of the remaining breaker components separately. Do not assume the manufacturer's referenced TA3K500 lugs, conductor range, and complete-breaker dimensions describe what this trip unit physically includes.