HJD63B300 - 300Amp Circuit Breaker

HJD63B300 - 300Amp Circuit Breaker

When replacing a circuit breaker, matching the existing equipment specifications is the most important step. The Siemens HJD63B300 molded case circuit breaker is designed for electrical systems that require a 300 amp, 3-pole breaker in the Siemens JD frame family. Whether you are maintaining existing equipment or replacing a matching breaker, verifying the frame type, amperage, voltage rating, and lug configuration helps ensure the right fit for the application.

Key Features and Benefits

• 300 amp, 3-pole molded case circuit breaker for compatible commercial and industrial electrical distribution systems
• Siemens SENTRON JD frame design for applications requiring a matching JD series breaker configuration
• Thermal-magnetic trip unit for overload and short-circuit protection
• 600V AC rating for properly specified electrical applications
• Includes load side lugs (TA2J6500) for compatible installations

Technical Specifications

• Manufacturer: Siemens
  
• Catalog Number: HJD63B300
  
• Product Type: Molded Case Circuit Breaker
  
• Frame Type: JD
  
• Number of Poles: 3
  
• Amperage Rating: 300 Amps
  
• Voltage Rating: 600 VAC
  
• Interrupting Capacity: 35kAIC at 600V / 65kAIC at 480V
  
• Trip Unit Type: Thermal-Magnetic
  
• Standards: UL 489 / IEC 60947-2
  
• Lug Type: TA2J6500 Load Side Lugs
  
• Copper Wire Range: 3/0 AWG - 500 kcmil
  
• Aluminum Wire Range: 4/0 AWG - 500 kcmil
  
• Dimensions: 7.5 in. W x 11 in. H x 4 in. D
  
• Weight: 0.022 lb
  
• Country of Origin: Mexico
  

Material Compliance and Certifications

The Siemens HJD63B300 is part of the Siemens SENTRON low voltage molded case circuit breaker family and is designed for applications requiring recognized electrical industry standards.

Certifications and standards include:

• UL 489 — Molded Case Circuit Breakers and Circuit Breaker Enclosures
• IEC 60947-2 — Low-voltage switchgear and controlgear circuit breaker standard

Where It Works Best

The Siemens HJD63B300 works best in commercial and industrial electrical distribution applications where a matching 300 amp, 3-pole JD frame molded case circuit breaker is required. It is suited for maintenance and replacement projects involving compatible switchboards, distribution equipment, and electrical systems designed around Siemens JD frame breakers.