NFJ631150 - 150Amp Circuit Breaker

NFJ631150 - 150Amp Circuit Breaker

If you're replacing an NFJ631150, getting the details right matters. This is a 150-amp, 3-pole molded case circuit breaker with a bolt-on design and thermal-magnetic trip protection. It has interrupting ratings of 22k AIC at 480VAC and 25k AIC at 240VAC, and a 40°C temperature rating. The breaker measures 9.31 inches high, 4.13 inches wide, and 3.75 inches deep, so you can compare the physical dimensions along with the electrical ratings when checking compatibility with your existing equipment. Load-side lug terminals are included. You may also see this breaker identified as NFJ434150 on equipment records, parts lists, or other documentation. For maintenance and replacement work, that cross-reference can be especially helpful. The NFJ631150 is built to last and is intended for applications that require this specific NFJ configuration, mounting style, dimensions, and electrical ratings.

Key Features and Benefits

• 150A, 3-pole configuration for equipment designed around these specific electrical requirements.
• Thermal-magnetic trip design provides overload and overcurrent protection within the breaker's rated operating characteristics.
• Bolt-on mounting lets the breaker connect securely to compatible equipment.
• Rated 22k AIC at 480VAC and 25k AIC at 240VAC.
• Includes load-side lug terminals, an important detail when matching replacement components.
• 40°C temperature rating for the specified application.
• Also identified by the NFJ434150 part number, which can make cross-referencing older equipment and documentation easier.
• Well suited to form, fit, and functional replacement applications when all specifications match the existing system.
• Built to last when correctly installed and operated within its stated ratings.

Technical Specifications

• Part Number: NFJ631150
  
• Alternate Part Number: NFJ434150
  
• Type: NFJ
  
• Breaker Type: Molded Case Circuit Breaker
  
• Trip Type: Thermal-Magnetic
  
• Mounting: Bolt-On
  
• Poles: 3
  
• Amperage: 150A
  
• Interrupting Rating: 22k AIC @ 480VAC
  
• Interrupting Rating: 25k AIC @ 240VAC
  
• Temperature Rating: 40°C
  
• Height: 9.31 in.
  
• Width: 4.13 in.
  
• Depth: 3.75 in.
  
• Ship Weight: 12.00 lbs. 
  
• Terminals: Load-Side Lug Terminals Included
  

Material Compliance and Certifications

• The available specifications for the NFJ631150 did not include specific material-compliance information or certification listings. If your installation requires a particular listing, certification, or material-compliance standard, confirm those requirements against the breaker identification and the equipment it will be installed in.
• As with any replacement circuit breaker, don't rely on the part number alone. Verify the electrical ratings, pole configuration, mounting method, physical dimensions, interrupting capacity, and other applicable equipment requirements before installation.

Where It Works Best

• The NFJ631150 is best suited for maintenance and replacement work involving compatible electrical equipment that requires an NFJ-type 150-amp, 3-pole, bolt-on molded-case circuit breaker.
• It's a particularly useful match for legacy installations where maintaining the correct form, fit, and function is the priority. If the existing equipment references NFJ631150 or NFJ434150, compare the breaker specifications carefully with the equipment's requirements.
• This breaker can be used in compatible commercial, industrial, and electrical distribution applications that call for its specific configuration and ratings. The key is the match: 150 amps, three poles, bolt-on mounting, the correct dimensions, and the required AIC and voltage ratings should all match the intended application.