LAP36300MB - 300 Amp Circuit Breaker

LAP36300MB - 300 Amp Circuit Breaker

The LAP36300MB is a 300A, 3-pole LA molded-case circuit breaker for unit-mount applications. It is rated 22kA at 600VAC and 10kA at 250VDC, and it comes with load-side lugs and a line-side terminal connection. One easy-to-overlook detail is the MB suffix. On this model, it identifies a shorter handle designed to provide the clearance needed for the panel door to close. That's worth checking closely when you're replacing a breaker in existing equipment.

Key Features and Benefits

• 300A, 3-pole configuration
• Manufacturer description specifies thermal overload and magnetic short-circuit sensing
• 1,500A magnetic hold current
• 3,000A magnetic tripping current
• Short MB handle designed to allow the applicable panel door to close
• Push-to-Trip permits manual tripping without exposure to live parts
• Unit-mount design
• Load-side lugs and line-side terminal connection
• AL400LA terminal identifier
  

Technical Specifications

• Catalog Number: LAP36300MB
  
• Product Type: Circuit Breaker
  
• Series / Type: LA
  
• Rated Current: 300A
  
• Poles: 3
  
• Wiring Configuration: 3-wire
  
• AC Rating: 600VAC, 22kA
  
• DC Rating: 250VDC, 10kA
  
• Breaking Capacity Code: A
  
• Magnetic Hold Current: 1,500A
  
• Magnetic Tripping Current: 3,000A
  
• Mounting: Unit mount
  
• Operator: Short lever
  
• Connection, Load Side: Lugs
  
• Connection, Line Side: Terminal
  
• Terminal Identifier: AL400LA
  
• Height: 11 in. (279.4 mm)
  
• Width: 6 in. (152.4 mm)
  
• Depth: 5.84 in. (148.34 mm)
  
• Application: HACR-rated
  
• Country of Origin: Mexico
  

Material Compliance and Certifications

• UL 489 / UL Listed
• CSA certified
• IEC certified
  

Where It Works Best

The LAP36300MB makes the most sense in existing and legacy equipment that requires its particular LA breaker configuration. The 300A rating and three-pole arrangement are obvious checkpoints, but several other details can determine whether the breaker is a suitable replacement.

Pay particular attention to the MB short handle. If the existing installation depends on that shorter operator for panel-door clearance, a breaker with a different handle configuration may not fit the same way.