LB3350 - 350Amp Circuit Breaker

LB3350 - 350Amp Circuit Breaker

The LB3350 is a 350-amp, 3-pole Type LB circuit breaker with a thermal-magnetic design and an interchangeable trip unit. If you're sourcing this breaker for existing equipment, the electrical ratings are only part of the match. For compatible installations, particularly older or legacy equipment, matching these details helps ensure you're getting the right form, fit, and function rather than simply another 350A breaker. When correctly selected, installed, and used within its specified ratings, the LB3350 is built to last in its intended application.

Key Features and Benefits

• 350A rating with a 3-pole configuration
• Type LB circuit breaker
• Thermal-magnetic operation
• Interchangeable trip unit
• 40°C rated
• Load-side terminals included
• Defined dimensions make it easier to check physical compatibility
• Suitable for form, fit, and functional replacement where the complete specifications match the existing equipment
  

Technical Specifications

• Part Number: LB3350
  
• Type: LB
  
• Amperage: 350A
  
• Poles: 3
  
• Trip Type: Thermal magnetic
  
• Trip Unit: Interchangeable
  
• AIC Rating: 22kA @ 600VAC
  
• AIC Rating: 30kA @ 480VAC
  
• AIC Rating: 42kA @ 240VAC
  
• Temperature Rating: 40°C
  
• Terminals: Load-side terminals included
  
• Height: 10.13 in.
  
• Width: 5.50 in.
  
• Depth: 3.94 in.
  
• Dimensions: 5.50"W x 10.13"L x 3.94"D
  
• Approx. Ship Weight: 16.00 lbs.
  

Material Compliance and Certifications

No specific UL, CSA, IEC, RoHS, REACH, or other certification or material-compliance information was supplied for the LB3350, so assume none.

Where It Works Best

The LB3350 makes the most sense in equipment calling for a 350A, 3-pole Type LB thermal-magnetic breaker with an interchangeable trip unit. That can be especially useful when maintaining existing or legacy electrical equipment where retaining the correct breaker characteristics is the priority.

Review the system's interrupting requirements: 22kA at 600VAC, 30kA at 480VAC, or 42kA at 240VAC, depending on the application. The 40°C rating and interchangeable trip configuration should also match.