MDL3450 - 450 Amp Circuit Breaker

MDL3450 - 450 Amp Circuit Breaker

When you replace an existing breaker, small configuration details matter as much as the amp rating. The MDL3450 is a 450-amp, 3-pole MDL thermal-magnetic circuit breaker with an interchangeable trip unit. For compatible existing or legacy electrical equipment requiring these characteristics, it can serve as a form, fit, and functional replacement candidate when all electrical and physical requirements match. Its solid construction is built to last when selected, installed, and maintained correctly.

Key Features and Benefits

• 450 Amp, 3-Pole Configuration: Provides a clearly defined 450A rating with three poles for straightforward comparison with an existing breaker.
• Thermal-Magnetic Operation: The MDL3450 uses the specified thermal-magnetic trip design.
• Interchangeable Trip Unit: The breaker includes an interchangeable trip unit, which can be important when matching legacy electrical equipment.
• Load Terminals Included: This MDL3450 configuration is specifically supplied with load terminals. The supplied specifications do not identify line-side terminals, so do not assume they are included.
• 40°C Rated: The specified 40°C rating provides another useful identification and application-matching point.
• HACR Rated: HACR rating is explicitly included in the available product specifications.

Technical Specifications

• Part Number: MDL3450
  
• Product Type: Thermal-Magnetic Circuit Breaker
  
• Type: MDL
  
• Amperes: 450A
  
• 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 product information specifically identifies the MDL3450 as HACR rated. No additional material-compliance or certification information was supplied for this exact catalog number. Therefore, do not infer UL, IEC, RoHS, REACH, or other certification and compliance status from related products or similar MDL breakers. If a particular certification is required, verify it for the exact MDL3450 before installation.

Where It Works Best

The MDL3450 450 amp circuit breaker is best evaluated as a replacement for compatible existing and legacy electrical equipment that requires the same MDL configuration and electrical characteristics. Start the replacement check with the catalog number, then confirm 450A, three poles, thermal-magnetic operation, an interchangeable trip unit, a 40°C rating, and the applicable AIC and voltage rating.