NFJ631125 - 125Amp Circuit Breaker

NFJ631125 - 125Amp Circuit Breaker

Looking for an NFJ631125 to match an existing breaker? Start with the specs. This is a 125-amp, 3-pole molded case circuit breaker with thermal-magnetic protection and a bolt-on mounting style. Its interrupting ratings are 22 kAIC at 480VAC and 25 kAIC at 240VAC. The breaker is rated at 40°C and measures 9.31" H x 4.13" W x 3.75" D. Load-side lug terminals are included. You may also see NFJ434125, which is associated with this breaker and can be useful when checking older equipment or maintenance records. For replacement work, those details matter. You want the amperage, pole count, mounting, dimensions, voltage, and interrupting rating to agree with the requirements of the equipment already in place. When those specifications match, the NFJ631125 can be a practical solution for keeping compatible legacy electrical equipment in service. It's built to last and designed for the job.

Key Features and Benefits

• 125A rating for equipment requiring this amperage and NFJ breaker configuration.
• Three poles for compatible 3-pole applications.
• Thermal-magnetic trip operation.
• Bolt-on design for equipment made to accept this mounting style.
• Rated 22k AIC at 480VAC.
• Rated 25k AIC at 240VAC.
• 40°C rating.
• Load-side lug terminals included.
• Also identified as NFJ434125, providing another useful number when checking existing equipment.
• A good fit for maintenance and replacement applications where you need to maintain the original form, fit, and electrical characteristics.

Technical Specifications

• Part Number: NFJ631125
  
• Also Known As: NFJ434125
  
• Type: NFJ
  
• Breaker Style: Molded Case Circuit Breaker
  
• Amperage: 125A
  
• Poles: 3
  
• Trip: Thermal-Magnetic
  
• Mounting: Bolt-On
  
• AIC @ 480VAC: 22k
  
• AIC @ 240VAC: 25k
  
• 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

• Specific certification and material compliance information was not included with the available product data. If your installation has particular listing or compliance requirements, check the markings on the breaker and the applicable equipment documentation. It's better to verify those details than assume a certification based on the part number alone.

Where It Works Best

• The NFJ631125 is best suited for maintenance and replacement work on compatible legacy electrical equipment. In many of these jobs, there's no reason to make the selection more complicated than it needs to be. The important question is whether the breaker matches what the equipment requires.
• Check the existing breaker and equipment specifications for 125 amps, three poles, NFJ type, bolt-on mounting, thermal-magnetic operation, voltage, AIC rating, terminal arrangement, and physical size. The alternate NFJ434125 number may also help when working from an older part number or maintenance record.
• Dimensions also deserve a quick check. At 9.31 inches high, 4.13 inches wide, and 3.75 inches deep, the NFJ631125 has a specific physical footprint. Matching that footprint, along with the electrical ratings, helps determine whether it fits the equipment you're working on.