HJD63B350 - 350Amp Circuit Breaker

HJD63B350 - 350Amp Circuit Breaker

When you’re replacing a breaker, the goal is usually simple: match what’s already in the panel so everything fits and functions the way it should. The Siemens HJD63B350 is built for exactly that kind of job. It’s a 350-amp, 3-pole molded-case circuit breaker in the Siemens JD frame line, commonly used in commercial and industrial power distribution systems. Part of the Siemens SENTRON family, the HJD63B350 is intended for use in existing electrical systems where consistency matters.

Key Features and Benefits

• 350 amp, 3-pole molded case circuit breaker for compatible commercial and industrial systems
• Siemens JD frame design for matching existing JD series breaker setups
• Thermal-magnetic trip unit for overload and short-circuit protection
• 600V AC rating for properly specified applications
• Interrupting ratings: 35kAIC at 600V / 65kAIC at 480V
• Includes load side lugs (TA2J6500) for installation compatibility

Technical Specifications

• Manufacturer: Siemens
  
• Catalog Number: HJD63B350
  
• Product Type: Molded Case Circuit Breaker
  
• Frame Type: JD
  
• Poles: 3
  
• Amperage: 350A
  
• Voltage Rating: 600 VAC
  
• Interrupting Capacity: 35kAIC at 600V / 65kAIC at 480V
  
• Trip Unit: Thermal-Magnetic
  
• Standards: UL 489 / IEC 60947-2
  
• Lug: Load Side (TA2J6500)
  
• Wire Range (Cu): 3/0 AWG – 500 kcmil
  
• Wire Range (Al): 4/0 AWG – 500 kcmil
  
• Dimensions: 7.5 in. W x 11 in. H x 4 in. D
  
• Weight: 20.084 lb
  
• Country of Origin: Mexico
  

Material Compliance and Certifications

The Siemens HJD63B350 is part of the SENTRON molded-case circuit breaker line and is manufactured to meet widely recognized electrical safety standards for commercial and industrial environments.

• UL 489 – Molded Case Circuit Breakers
• IEC 60947-2 – Low-voltage switchgear and controlgear standard

Where It Works Best

The Siemens HJD63B350 is commonly used in commercial and industrial facilities where Siemens JD frame breakers are already in place. It fits well in maintenance and replacement scenarios involving switchboards, distribution panels, and legacy electrical systems that require a 350 amp, 3-pole breaker with matching specifications.