JJ3B300 - 300Amp Circuit Breaker

JJ3B300 - 300Amp Circuit Breaker

The JJ3B300 has a pretty specific set of numbers to work from when you're replacing a breaker in existing equipment. It's rated at 300 amps with three poles and uses a JJ3 frame. The JJ3B300 is built to last and meets the needs of compatible existing and legacy equipment when its frame, electrical ratings, and physical dimensions align with the original application.

Key Features and Benefits

• 300A, three-pole configuration provides clear electrical identifiers for replacement matching.
• The JJ3 frame type helps confirm compatibility with equipment that requires this particular frame.
• 40°C rating is part of the supplied product specifications.
• Identified as a Type ET 400 Ampere "JJ" Frame molded case circuit breaker.
  

Technical Specifications

• Part Number: JJ3B300
  
• Product Type: Molded Case Circuit Breaker
  
• Frame Type: JJ3
  
• Additional Identification: Type ET 400 Ampere "JJ" Frame
  
• Amperage: 300A
  
• Poles: 3
  
• AIC at 240VAC: 42 kA
  
• AIC at 480VAC: 30 kA
  
• AIC at 600VAC: 22 kA
  
• Temperature Rating: 40°C
  
• Width: 9.00 in.
  
• Height / Length: 11.00 in.
  
• Depth: 4.00 in.
  
• Overall Dimensions: 9.00 in. W × 11.00 in. L × 4.00 in. D
  
• Approximate Ship Weight: 22.00 lb.
  

Material Compliance and Certifications

No specific UL, CSA, IEC, RoHS, REACH, or other certification or material-compliance information was provided for the JJ3B300. These certifications should not be assumed based on the breaker type or frame designation. Where a particular approval is required, confirm it from the breaker labeling or applicable technical documentation.

Where It Works Best

The JJ3B300 belongs in the conversation when an existing or legacy installation calls for a 300A, three-pole JJ3-frame molded case circuit breaker. The frame designation is important, but don't stop there. Compare the 9.00 × 11.00 × 4.00-inch dimensions and the Type ET "JJ" Frame identification with those of the breaker being replaced.