JD63B350L - 350Amp Circuit Breaker

JD63B350L - 350Amp Circuit Breaker

With the Siemens JD63B350L, there are a few numbers worth checking before anything else: 350 amps, three poles, 600V, and a JD frame. This SENTRON molded case circuit breaker uses a thermal-magnetic trip unit and carries a standard 40°C rating. The JD63B350L is built to last and meets UL 489 and IEC 60947-2 standards. For existing or legacy equipment, check all of these details against your original installation rather than relying on amperage alone.

Key Features and Benefits

• 350A, 3-pole design: Gives you two of the first specifications to confirm when identifying the correct replacement.
• JD frame: Helps narrow down compatibility with existing equipment that specifically requires this frame.
• Thermal-magnetic trip unit: Matches the trip-unit type specified for the JD63B350L.
• TA2J6500 lugs included: Siemens specifies these lugs on both the line and load sides.
• Copper and aluminum conductor compatibility: Accepts 3/0 AWG–500 kcmil copper and 4/0 AWG–500 kcmil aluminum conductors.
• Standard 40°C rating: Clearly identified in the manufacturer specifications.
  

Technical Specifications

• Manufacturer: Siemens
  
• Catalog Number / MFN: JD63B350L
  
• Article Number: US2:JD63B350L
  
• 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 Capacity at 600V: 25 kAIC
  
• Interrupting Capacity at 480V: 35 kAIC
  
• Line-Side Lugs: TA2J6500
  
• 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: 19.533 lb
  
• UPC: 783643009165
  
• Commodity Code: 8536200020
  
• Country of Origin: Mexico
  
• Standards: UL 489 / IEC 60947-2
  

Material Compliance and Certifications

According to the manufacturer information, the JD63B350L meets UL 489 and IEC 60947-2 standards. The supplied specifications do not separately state that this catalog number is UL Listed, so it is better not to make that additional claim.

Where It Works Best

The JD63B350L belongs in the conversation when you're replacing a breaker in compatible existing or legacy equipment that calls for this particular combination of 350A capacity, three poles, JD frame, thermal-magnetic trip unit, 600V rating, and TA2J6500 line- and load-side lugs. Its stated dimensions also give you something concrete to compare with the breaker and space already in the installation.