JD63B300L - 300Amp Circuit Breaker

JD63B300L - 300Amp Circuit Breaker

The Siemens JD63B300L gives you a clearly defined set of specifications to check against an existing installation. It is a 300A, three-pole SENTRON molded-case circuit breaker with a JD frame, a thermal-magnetic trip unit, and a 600V rating. It is built to last and is a practical choice for compatible existing and legacy equipment when the frame, amperage, poles, electrical ratings, trip configuration, connections, and dimensions all align with the original requirements.

Key Features and Benefits

• 300A, three-pole configuration provides clear electrical characteristics for replacement matching.
• JD frame helps identify physical and equipment compatibility.
• Thermal-magnetic trip unit follows the configuration specified for this model.
• Standard 40°C breaker according to the manufacturer's specifications.
• Supplied with TA2J6500 line-side and load-side lugs, an important detail when checking connection compatibility.
• Accepts 3/0 AWG–500 kcmil copper conductors.
• Accepts 4/0 AWG–500 kcmil aluminum conductors.
  

Technical Specifications

• Catalog Number / MFN: JD63B300L
  
• Article Number: US2:JD63B300L
  
• Manufacturer: Siemens
  
• Product Line: SENTRON
  
• Product Family: JD6, 25 kAIC, 600VAC
  
• Product Type: Molded Case Circuit Breaker
  
• Frame: JD
  
• Amperage Rating: 300 A
  
• Number of Poles: 3
  
• Voltage Rating: 600V
  
• Trip Unit: Thermal-magnetic
  
• Temperature Rating: Standard 40°C
  
• Interrupting Rating at 600V: 25 kAIC
  
• Interrupting Rating 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
  
• Dimensions: 7.5" W x 11" H x 4" D
  
• Net Weight: 19.533 lb
  
• UPC: 783643009158
  
• Commodity Code: 8536200020
  
• Country of Origin: Mexico
  
• Standards: UL 489 and IEC 60947-2
  

Material Compliance and Certifications

According to the supplied Siemens specifications, the JD63B300L meets UL 489 and IEC 60947-2 standards. The manufacturer information does not specifically state that this catalog number is UL Listed, so the standards claim should remain limited to the wording provided by Siemens.

Where It Works Best

The JD63B300L is best considered for compatible existing and legacy electrical equipment that calls for a 300A, three-pole JD-frame molded case circuit breaker with the same electrical and physical characteristics. Because this model includes TA2J6500 lugs on both the line and load sides, the existing conductor material and size should also fall within the specified lug ranges.