MDL3300 - 300 Amp Circuit Breaker

MDL3300 - 300 Amp Circuit Breaker

The MDL3300 is a 300-amp, 3-pole MDL thermal-magnetic circuit breaker for your applications that require this specific electrical and physical configuration. It has an interchangeable trip unit, is rated for 40°C, and carries a HACR rating. For legacy electrical equipment requiring the MDL type, the MDL3300 can be considered a form, fit, and functional replacement candidate when the amperage, pole count, voltage, interrupting rating, trip configuration, dimensions, and terminal requirements all match. Its solid construction is built to last when selected, installed, and maintained correctly.

Key Features and Benefits

• 300 Amp, 3-Pole Configuration: Provides the specified 300A rating and three-pole arrangement for compatible electrical equipment.
• Thermal-Magnetic Protection: Uses the specified thermal-magnetic trip design.
• Interchangeable Trip Unit: The MDL3300 includes an interchangeable trip unit, an important configuration detail when matching existing MDL equipment.
• 40°C Rated: The supplied specifications identify this breaker as 40°C rated.
• HACR Rated: The product specifications explicitly include a HACR rating.
• Load Terminals Included: This breaker includes load terminals. Terminal material, conductor range, and line-side terminal configuration were not provided and should not be assumed.

Technical Specifications

• Part Number: MDL3300
  
• Product Type: Thermal-Magnetic Circuit Breaker
  
• Type: MDL
  
• Amperes: 300A
  
• Poles: 3
  
• A.I.C. Rating at 600VAC: 25kAIC
  
• A.I.C. Rating at 480VAC: 50kAIC
  
• A.I.C. Rating at 240VAC: 65kAIC
  
• Trip Type: Thermal-Magnetic
  
• Trip Unit: Interchangeable
  
• Temperature Rating: 40°C
  
• HACR Rated: Yes
  
• Included Terminals: Load terminals
  
• Height: 16.00 in.
  
• Width: 8.25 in.
  
• Depth: 4.06 in.
  
• Dimensions: 8.25"W x 16.00"H x 4.06"D
  
• Approx. Ship Weight: 35.00 lbs.
  

Material Compliance and Certifications

The supplied product information identifies the MDL3300 as HACR-rated. No additional certification or material-compliance information—such as UL, IEC, RoHS, or REACH status—was provided for this exact part number. Do not infer those listings from similar MDL breakers. If a particular certification or material requirement is necessary for the installation, verify it against documentation for the exact MDL3300.

Where It Works Best

The MDL3300 300 amp circuit breaker suits compatible existing or legacy electrical equipment that requires a 3-pole MDL thermal-magnetic breaker with an interchangeable trip unit. Match the required interrupting rating to the system voltage: 25kAIC at 600VAC, 50kAIC at 480VAC, or 65kAIC at 240VAC.

For replacement work, don't stop at matching the 300A rating. Confirm the MDL type, three-pole configuration, thermal-magnetic trip design, interchangeable trip unit, 40°C rating, HACR requirement, load-terminal configuration, and 8.25"W x 16.00"H x 4.06"D physical size. Because the line-side terminal details, conductor range, and mounting information were not supplied, check those requirements separately before installation.