JD63B350 - 350Amp Circuit Breaker

JD63B350 - 350Amp Circuit Breaker

The Siemens JD63B350 has a fairly specific footprint: 7.5 inches wide, 11 inches high, and 4 inches deep. That gives you a useful starting point when you're checking a replacement against an existing installation. From there, the electrical details need to line up. For legacy replacement work, check these details against the breaker being replaced and the equipment requirements to confirm the proper form, fit, and function.

Key Features and Benefits

• 350A, three-pole configuration for equipment that specifically requires these ratings.
• JD frame provides an important reference when confirming compatibility with an existing installation.
• Thermal-magnetic trip unit matches the trip technology specified by Siemens for the JD63B350.
• The standard 40°C rating is clearly identified in the manufacturer's specifications.
• Accepts 3/0 AWG through 500 kcmil copper conductors.
• Accepts 4/0 AWG through 500 kcmil aluminum conductors.
  

Technical Specifications

• Catalog Number / MFN: JD63B350
  
• Article Number: US2:JD63B350
  
• Manufacturer: Siemens
  
• Product Line: SENTRON
  
• Product Family: JD6, 25 kAIC, 600VAC
  
• Product Type: Molded Case Circuit Breaker
  
• Frame: JD
  
• Amperage: 350A
  
• Poles: 3
  
• Voltage: 600V
  
• Trip Unit: Thermal-magnetic
  
• Temperature Rating: Standard 40°C
  
• Interrupting Rating at 600V: 25 kAIC
  
• Interrupting Rating at 480V: 35 kAIC
  
• Load-Side Lugs: TA2J6500
  
• Copper Wire Range: 3/0 AWG–500 kcmil
  
• Aluminum Wire Range: 4/0 AWG–500 kcmil
  
• Width: 7.5 in.
  
• Height: 11 in.
  
• Depth: 4 in.
  
• Net Weight: 19.996 lb
  
• UPC: 783643213203
  
• Country of Origin: Mexico
  
• Standards: UL 489 / IEC 60947-2
  

Material Compliance and Certifications

According to Siemens, the JD63B350 meets UL 489 and IEC 60947-2 standards. The supplied product information does not specifically state that the JD63B350 is UL Listed, so that separate certification claim should not be assumed.

Where It Works Best

The JD63B350 meets the needs of compatible existing and legacy equipment that calls for this particular combination of 350A capacity, three-pole configuration, JD frame, 600V rating, thermal-magnetic trip unit, and physical dimensions. It's also important to check the connections: this model has TA2J6500 lugs on the load sides, with different specified wire ranges for copper and aluminum conductors.