LL3B450 - 450Amp Circuit Breaker

LL3B450 - 450Amp Circuit Breaker

Working with an LL3B450? Start with the whole breaker specification, not just the 450A rating. This is a 3-pole, 450A molded case circuit breaker in the LL3 type, identified as Type ET on a 600 Ampere LL frame. It's rated at 40°C, and it has three A.I.C. ratings to keep straight: 42 kA at 240VAC, 30 kA at 480VAC, and 22 kA at 600VAC. Those numbers matter when you're trying to match a breaker already installed in older electrical equipment. A 450A label gets you part of the way there. The rest of the specification tells you whether you're actually looking at the right breaker.

Key Features and Benefits

• 450A current rating
• 3-pole molded case circuit breaker
• LL3 type
• Type ET identification
• 600 Ampere LL frame
• 40°C rating
• Multiple A.I.C. ratings make it easier to check the breaker against the actual system voltage

Technical Specifications

• Part Number: LL3B450
  
• Product Type: Molded Case Circuit Breaker
  
• Type: LL3
  
• Amperage: 450A
  
• Poles: 3
  
• Frame: 600 Ampere LL Frame
  
• Identification: Type ET
  
• Temperature Rating: 40°C
  
• A.I.C. Rating at 240VAC: 42 kA
  
• A.I.C. Rating at 480VAC: 30 kA
  
• A.I.C. Rating at 600VAC: 22 kA
  
• Width: 9 in.
  
• Height: 11 in.
  
• Depth: 4 in.
  
• Overall Dimensions: 9.00"W x 11.00"H x 4.00"D
  

Material Compliance and Certifications

No specific UL, CSA, IEC, RoHS, REACH, or other certification or material-compliance information was provided for the exact LL3B450.

Where It Works Best

The LL3B450 makes the most sense in a fairly straightforward situation: you're maintaining existing or legacy electrical equipment, and the breaker you're replacing points back to this particular LL3 configuration.

That's a better way to approach an LL3B450 replacement circuit breaker than searching by amperage alone. When the electrical ratings and physical configuration agree with the equipment already in service, you have the information needed to evaluate the breaker for the required form, fit, and function.