LL3B350 - 350Amp Circuit Breaker

LL3B350 - 350Amp Circuit Breaker

Matching an LL3B350 comes down to a few specific details. It's a 350A, 3-pole molded case circuit breaker identified as Type LL3, with the supplied information describing it as a Type ET, 600 Ampere LL-frame breaker. Its A.I.C. rating isn't one-size-fits-all, either. The rating is 42 kA at 240VAC, 30 kA at 480VAC, and 22 kA at 600VAC. The breaker is also specified at 40°C. If you're working on existing electrical equipment, that information matters far more than simply finding another breaker with "350A" on it.

Key Features and Benefits

• 350A 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
• Voltage-specific interrupting ratings provide useful application-matching information
• A practical replacement candidate when the existing equipment calls for the LL3B350 form, fit, and electrical function

Technical Specifications

• Part Number: LL3B350
  
• Product Type: Molded Case Circuit Breaker
  
• Type: LL3
  
• Frame: 600 Ampere LL Frame
  
• Additional Identification: Type ET
  
• Amperage: 350A
  
• 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 available specifications for the LL3B350 don't identify exact UL, CSA, IEC, RoHS, REACH, or other certification and material-compliance information. No additional certification status is being inferred from similar LL-frame circuit breakers.

Where It Works Best

The LL3B350 350A circuit breaker is worth considering when servicing existing or legacy electrical equipment that already requires this particular three-pole, LL-frame configuration.

Here's one detail you don't want to skim over: system voltage changes the applicable interrupting rating. On a 240VAC system, the supplied A.I.C. rating is 42 kA. At 480VAC, it's 30 kA. For 600VAC, the rating is 22 kA. That makes the system voltage an important factor in identifying the correct application.