JD63B400L - 400Amp Circuit Breaker

JD63B400L - 400Amp Circuit Breaker

The Siemens JD63B400L is a 400A, three-pole SENTRON molded-case circuit breaker with a JD frame and a thermal-magnetic trip unit. For replacement work, its electrical ratings give you clear points to check against the breaker and equipment already in place: 25 kAIC at 600V and 35 kAIC at 480V, along with Siemens' standard 40°C rating. Connection details are equally specific. The JD63B400L is built to last and is suited to compatible existing and legacy systems where the amperage, frame, pole count, trip type, interrupting ratings, connections, and physical dimensions match the installation requirements.

Key Features and Benefits

• 400A, three-pole breaker: Matches equipment requiring this specific amperage and pole arrangement.
• JD frame: Provides an important identifier when checking form and physical compatibility with an existing installation.
• Thermal-magnetic trip unit: Uses the trip-unit type specified by Siemens for the JD63B400L.
• TA2J6500 lugs on both sides: Line- and load-side lugs are identified by Siemens, making the connection arrangement easier to verify.
• Copper and aluminum conductor compatibility: Lugs accept 3/0 AWG–500 kcmil copper and 4/0 AWG–500 kcmil aluminum conductors.
• Standard 40°C rating: Another manufacturer-specified characteristic to compare with the requirements of the existing system.
  

Technical Specifications

• Manufacturer: Siemens
  
• Catalog Number / MFN: JD63B400L
  
• Article Number: US2:JD63B400L
  
• Product Line: SENTRON
  
• Product Family: JD6, 25 kAIC, 600VAC
  
• Product Type: Molded Case Circuit Breaker
  
• Frame: JD
  
• Amperage Rating: 400A
  
• Number of Poles: 3
  
• Voltage Rating: 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 Conductor Range: 3/0 AWG–500 kcmil
  
• Aluminum Conductor Range: 4/0 AWG–500 kcmil
  
• Width: 7.5 in.
  
• Height: 11 in.
  
• Depth: 4 in.
  
• Net Weight: 19.533 lb
  
• UPC: 783643009172
  
• Commodity Code: 8536200020
  
• Country of Origin: Mexico
  
• Standards: UL 489 / IEC 60947-2
  

Material Compliance and Certifications

According to the supplied Siemens specifications, the JD63B400L meets UL 489 and IEC 60947-2 standards. The manufacturer data provided does not separately identify this catalog number as UL Listed, so the standards claim should remain limited to Siemens' stated wording rather than adding a certification that has not been confirmed.

Where It Works Best

The JD63B400L is best suited to compatible existing and legacy electrical equipment that calls for a 400A, three-pole JD-frame molded case circuit breaker with a thermal-magnetic trip unit and the same physical and electrical characteristics. The supplied TA2J6500 line- and load-side lugs are an important part of that compatibility check, particularly when confirming conductor material and size.