JD63T300 - 300Amp Trip Unit

JD63T300 - 300Amp Trip Unit

The Siemens JD63T300 is a 300A, three-pole thermal-magnetic trip unit for the JD frame. Siemens identifies this catalog number as "TU ONLY," so that distinction should be checked closely when you're replacing a component in existing or legacy equipment. For replacement work, compare these details with the existing component and equipment requirements before installation.

Key Features and Benefits

• 300A rating: Matches applications specifically calling for the JD63T300's 300-amp rating.
• Three-pole configuration: Gives you another important identifier when checking an existing component.
• Trip unit only: Siemens specifically describes the JD63T300 as TU ONLY, rather than simply identifying it as a complete breaker.
• JD frame: Intended for compatible equipment requiring the specified JD-frame arrangement.
• Thermal-magnetic trip unit: Uses the trip-unit type stated in the Siemens product information.
• TA2J6500 lugs included: Siemens specifies these lugs on both the line and load sides.
• Copper or aluminum conductors: Accommodates the stated conductor ranges for either material.
  

Technical Specifications

• Manufacturer: Siemens
  
• Catalog Number / MFN: JD63T300
  
• Article Number: US2:JD63T300
  
• Product Line: SENTRON
  
• Product Family: JD6, 25 kAIC, 600VAC
  
• Configuration: Trip Unit Only (TU ONLY)
  
• Frame: JD
  
• Amperage: 300A
  
• Poles: 3
  
• Voltage: 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 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: 2.2 lb
  
• UPC: 783643213470
  
• Commodity Code: 85363099
  
• Country of Origin: Mexico
  
• Standards: UL 489 / IEC 60947-2
  

Material Compliance and Certifications

Siemens states that the JD63T300 meets UL 489 and IEC 60947-2 standards. The supplied manufacturer information does not separately identify the JD63T300 as UL Listed, so it is better to keep the wording to the standards claim Siemens actually provides.

Where It Works Best

The JD63T300 belongs in the conversation when you're working with existing or legacy equipment that specifically calls for a 300A, three-pole JD-frame thermal-magnetic trip unit with these ratings and physical characteristics. The TU ONLY designation is especially important here. Don't assume that matching "JD" and "300A" by themselves is enough.