LL3B300 - 300Amp Circuit Breaker

LL3B300 - 300Amp Circuit Breaker

An LL3B300 is a pretty specific piece of equipment. You're looking at a 300A, 3-pole molded case circuit breaker, identified as Type LL3 and a Type ET, 600 Ampere LL-frame breaker. Just as important, its interrupting capacity depends on the system voltage. The supplied ratings are 42 kA at 240VAC, 30 kA at 480VAC, and 22 kA at 600VAC. It's also specified at 40°C. For someone replacing a breaker in existing equipment, those are the details to focus on. The goal isn't to find another breaker marked 300 amps; it's to match the electrical and physical requirements.

Key Features and Benefits

• 300A rated current
• 3-pole molded case circuit breaker
• LL3 type configuration
• Identified as a Type ET, 600 Ampere LL-frame breaker
• Specified at 40°C
• Approximately 9"W x 11"H x 4"D
• Clearly stated voltage-specific A.I.C. ratings help with application matching
• Appropriate to evaluate for form, fit, and functional replacement when existing equipment specifically requires the LL3B300 configuration

Technical Specifications

• Part Number: LL3B300
  
• Product Type: Molded Case Circuit Breaker
  
• Type: LL3
  
• Frame: 600 Ampere LL Frame
  
• Additional Identification: Type ET
  
• Amperage: 300A
  
• Poles: 3
  
• Temperature Rating: 40°C
  
• A.I.C. at 240VAC: 42 kA
  
• A.I.C. at 480VAC: 30 kA
  
• A.I.C. at 600VAC: 22 kA
  
• Width: 9 in.
  
• Height: 11 in.
  
• Depth: 4 in.
  
• Dimensions: 9.00"W x 11.00"H x 4.00"D
  

Material Compliance and Certifications

The supplied information for the LL3B300 does not identify specific UL, CSA, IEC, RoHS, REACH, or other certification and material-compliance details.

Where It Works Best

The LL3B300 300A circuit breaker is most relevant when you're working with existing or legacy electrical equipment that requires this three-pole LL-frame configuration.