LD3300L - 300Amp Circuit Breaker

LD3300L - 300Amp Circuit Breaker

The LD3300L is a 300-amp, 3-pole Type LD thermal-magnetic circuit breaker with an interchangeable trip unit. It's the kind of breaker where matching the details matters, especially when you're sourcing a replacement for equipment that's already in service. For older or legacy equipment that calls for this Type LD configuration, the LD3300L can be a good form, fit, and functional replacement when the ratings, trip arrangement, connections, and physical fit all match. Properly selected, installed, and kept within its specified application and ratings, it's built to last for the work it was designed to handle.

Key Features and Benefits

• 300-amp, 3-pole Type LD circuit breaker
• Thermal-magnetic operation
• Uses an interchangeable trip unit
• 40°C rated
• HACR rated
• Line and load terminals are included
• Defined dimensions make physical compatibility easier to check
  

Technical Specifications

• Part Number: LD3300L
  
• Type: LD
  
• Breaker Type: Thermal-Magnetic Circuit Breaker
  
• Amperage: 300A
  
• Number of Poles: 3
  
• Trip Unit: Interchangeable
  
• AIC Rating at 600VAC: 25kA
  
• AIC Rating at 480VAC: 35kA
  
• AIC Rating at 240VAC: 65kA
  
• Temperature Rating: 40°C
  
• HACR Rated: Yes
  
• Terminals: Line and load terminals included
  
• Height: 10.75 in.
  
• Width: 8.25 in.
  
• Depth: 4.06 in.
  
• Dimensions: 8.25"W x 10.75"H x 4.06"D
  
• Approximate Ship Weight: 24 lbs.
  

Material Compliance and Certifications

The supplied specifications identify the LD3300L as HACR-rated. No specific UL, CSA, IEC, RoHS, REACH, or other material-compliance or certification information was provided, so don't assume those details.

Where It Works Best

The LD3300L makes the most sense in compatible existing or legacy equipment that requires a 300A, 3-pole Type LD thermal-magnetic breaker. It can be especially useful when the job requires maintaining the original electrical and physical configuration rather than changing the surrounding equipment.

When checking a potential match, compare the required interrupting capacity at the actual operating voltage: 25kA at 600VAC, 35kA at 480VAC, or 65kA at 240VAC. Next, confirm the interchangeable trip-unit configuration, terminal arrangement, mounting requirements, and 8.25 "W x 10.75 "H x 4.06 "D dimensions.