MDL3350 - 350 Amp Circuit Breaker

MDL3350 - 350 Amp Circuit Breaker

Finding the right replacement for your breaker comes down to matching the details, not just the amp rating. The MDL3350 is a 350 amp, 3-pole MDL thermal-magnetic circuit breaker with an interchangeable trip unit, 40°C rating, and HACR rating. When the catalog number, electrical ratings, trip configuration, terminal requirements, and physical fit align, this breaker can serve as a form, fit, and functional replacement candidate for compatible existing or legacy electrical equipment. Its solid construction is built to last when the breaker is selected, installed, and maintained correctly.

Key Features and Benefits

• 350A, 3-Pole Rating: Provides the specified 350 amp, three-pole configuration for equipment requiring an MDL3350.
• Thermal-Magnetic Circuit Breaker: Uses the thermal-magnetic trip design identified for this model.
• Interchangeable Trip Unit: The breaker includes an interchangeable trip unit, an important configuration detail when matching existing equipment.
• Load Terminals Included: The supplied product information specifically states that load terminals are included. Line terminals are not listed as included and should not be assumed.
• 40°C Rated: The MDL3350 is specified with a 40°C rating.
• HACR Rated: HACR rating is explicitly listed in the available product information.

Technical Specifications

• Part Number: MDL3350
  
• Product Type: Thermal-Magnetic Circuit Breaker
  
• Type: MDL
  
• Amperes: 350A
  
• 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 available specifications identify the MDL3350 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. Verify those details for the MDL3350 rather than assume them from other breakers in the MDL family.

Where It Works Best

The MDL3350 350 amp circuit breaker is best considered where compatible existing or legacy electrical equipment calls for a 3-pole, 350A 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, compare the 8.25"W x 16.00"H x 4.06"D dimensions, 350A rating, three-pole configuration, trip-unit design, 40°C rating, HACR requirement, and terminal arrangement with the existing breaker.