JD63T400 - 400Amp Trip Unit

JD63T400 - 400Amp Trip Unit

With the Siemens JD63T400, one detail is worth noting before you compare anything else: Siemens marks this catalog number "TU ONLY," meaning "trip unit only." For replacement work in existing or legacy SENTRON JD-frame equipment, that distinction can be just as important as the amp rating. The JD63T400 is built to last, but the correct replacement still comes down to matching its complete electrical, connection, and physical specifications to the equipment already in service.

Key Features and Benefits

• 400A, three-pole rating: Clearly defined amperage and pole configuration make it easier to check the part against existing equipment requirements.
• Trip-unit-only configuration: Siemens specifically identifies the JD63T400 as TU ONLY, an important distinction when sourcing the correct component.
• JD frame compatibility: The manufacturer specifies this thermal-magnetic trip unit for the JD frame.
• 600V rating: Matches equipment requiring the stated 600V configuration.
• TA2J6500 lugs: Line- and load-side lugs are specified by Siemens for this model.
• Copper and aluminum conductor compatibility: Accepts the stated wire ranges for both conductor materials.
  

Technical Specifications

• Manufacturer: Siemens
  
• Catalog Number / MFN: JD63T400
  
• Article Number: US2:JD63T400
  
• Product Line: SENTRON
  
• Product Family: JD6, 25 kAIC, 600VAC
  
• Manufacturer Configuration: Trip Unit Only (TU ONLY)
  
• Frame: JD
  
• Amperage Rating: 400A
  
• Number of Poles: 3
  
• Voltage Rating: 600V
  
• Trip Type: Thermal-magnetic
  
• 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
  
• Width: 7.5 in.
  
• Height: 11 in.
  
• Depth: 4 in.
  
• Net Weight: 2.5 lb
  
• UPC: 783643213494
  
• Commodity Code: 85363099
  
• Country of Origin: Mexico
  
• Standards: UL 489 / IEC 60947-2
  

Material Compliance and Certifications

Siemens states that the JD63T400 meets UL 489 and IEC 60947-2 standards. The supplied manufacturer information does not separately identify this catalog number as UL Listed, so that designation should not be assumed solely from its stated compliance with UL 489.

Where It Works Best

The Siemens JD63T400 is suited to compatible existing and legacy SENTRON JD-frame equipment that calls for this specific 400A, three-pole, thermal-magnetic trip-unit configuration. Because Siemens labels the catalog number TU ONLY, confirm that the existing assembly requires a trip-unit-only component rather than assuming the catalog number represents a complete breaker.