MDL3400L - 400 Amp Circuit Breaker

MDL3400L - 400 Amp Circuit Breaker

Finding the right replacement breaker often comes down to a few details you can't overlook. The MDL3400L is a 400 amp, 3-pole MDL thermal-magnetic circuit breaker with an interchangeable trip unit, 40°C rating, and HACR rating. For your existing or legacy electrical equipment that requires these characteristics, the MDL3400L can be considered a form, fit, and functional replacement candidate when all application specifications match. Solid construction is built to last when the breaker is selected, installed, and maintained correctly.

Key Features and Benefits

• 400 Amp, 3-Pole Configuration: The MDL3400L carries a 400A rating and three-pole configuration, giving buyers clear electrical characteristics to compare with the breaker being replaced.
• Thermal-Magnetic Circuit Breaker: Uses the specified thermal-magnetic trip design for applications calling for this breaker type.
• Interchangeable Trip Unit: The interchangeable trip unit is an important configuration detail when identifying a suitable replacement for compatible equipment.
• Line and Load Terminals Included: Unlike configurations supplied with only one terminal set, the MDL3400L is specifically listed as including both line and load terminals.
• 40°C Rated: The specified 40°C rating provides another important point to confirm against the requirements of the existing installation.
• HACR Rated: The supplied product specifications specifically include the HACR rating.

Technical Specifications

• Part Number: MDL3400L
  
• Product Type: Thermal-Magnetic Circuit Breaker
  
• Type: MDL
  
• Amperes: 400A
  
• 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: Line and 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 specifications identify the MDL3400L as HACR rated. No additional certification or material-compliance information was provided for this exact catalog number. For that reason, do not assume UL, IEC, RoHS, REACH, or other certification and compliance status based on similar MDL products. Verify any application's certification requirements for the MDL3400L before installation.

Where It Works Best

The MDL3400L 400 amp circuit breaker is a practical replacement candidate for compatible existing and legacy electrical equipment that specifically requires its combination of MDL type, amperage, poles, voltage, interrupting capacity, trip configuration, and physical size.

For replacement work, start with the MDL3400L catalog number, then confirm the 400A rating, three poles, thermal-magnetic operation, interchangeable trip unit, and 40°C rating. The interrupting capacity must match the applicable rating: 25kAIC at 600VAC, 50kAIC at 480VAC, or 65kAIC at 240VAC. The line and load terminal configuration should also match the equipment being serviced.