JD63T350 - 350Amp Trip Unit

JD63T350 - 350Amp Trip Unit

The Siemens JD63T350 is worth a careful review if the equipment calls for a 350-amp JD-frame component. Siemens describes this catalog number as "TU ONLY" (trip unit only), so that detail should be confirmed before treating it as a replacement part. The JD63T350 is built to last, while the deciding factor for replacement work remains simple: its specifications must match the requirements of your existing equipment.

Key Features and Benefits

• 350A, three-pole configuration: Gives you two of the first specifications to verify against the existing unit.
• Trip unit only: Siemens specifically labels the JD63T350 TU ONLY to help distinguish the component configuration when sourcing replacements.
• JD frame: Intended for equipment requiring the stated JD-frame arrangement.
• Thermal-magnetic trip unit: Uses the trip technology identified in the manufacturer specifications.
• TA2J6500 lugs included: Siemens specifies these lugs on both the line and load sides.
• Copper or aluminum conductors: Accommodates the manufacturer-specified wire ranges for either conductor material.
  

Technical Specifications

• Manufacturer: Siemens
  
• Catalog Number / MFN: JD63T350
  
• Article Number: US2:JD63T350
  
• Product Line: SENTRON
  
• Product Family: JD6, 25 kAIC, 600VAC
  
• Component: Trip Unit Only (TU ONLY)
  
• Frame: JD
  
• Amperage Rating: 350A
  
• 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
  
• Dimensions (W x H x D): 7.5 x 11 x 4 in.
  
• Net Weight: 2.48 lb
  
• UPC: 783643213487
  
• Commodity Code: 85363099
  
• Country of Origin: Mexico
  
• Standards: UL 489 / IEC 60947-2
  

Material Compliance and Certifications

Siemens states that the JD63T350 meets UL 489 and IEC 60947-2 standards. The manufacturer information provided for this catalog number does not separately identify it as UL Listed, so that claim should not be added based only on the standards statement.

Where It Works Best

The JD63T350 belongs in the conversation when existing or legacy equipment specifically calls for a 350A, three-pole JD-frame thermal-magnetic trip unit with these electrical and physical characteristics. The TU ONLY designation matters here; it should be checked alongside the frame and ratings, rather than assuming the catalog number represents a complete breaker.