NFJ621175 - 175Amp Circuit Breaker

NFJ621175 - 175Amp Circuit Breaker

If you're looking for an NFJ621175 circuit breaker, you're likely trying to match a breaker already installed in existing equipment. That's where the details matter. The NFJ621175 is a 175-amp, 2-pole molded-case circuit breaker with a bolt-on design and thermal-magnetic trip operation. It has interrupting ratings of 22 kA at 480VAC and 25 kA at 240VAC and a 40°C rating. Physical dimensions are approximately 9.31 inches high, 4.13 inches wide, and 3.75 inches deep, with load-side lug terminals included. You may also come across the part number NFJ424175 when checking older records or identifying an existing breaker. For maintenance and replacement work, the goal is straightforward: match the breaker to the equipment it was designed for. Before installation, check the frame, amperage, poles, mounting method, voltage and interrupting ratings, dimensions, and terminal arrangement. When those requirements call for an NFJ621175, this breaker provides the appropriate form, fit, and function for the application. It's a straightforward, built-to-last component for compatible legacy electrical equipment.

Key Features and Benefits

• 175-amp rating for applications specifically designed around a 175A breaker.
• Two-pole configuration for compatible electrical distribution equipment.
• Thermal-magnetic trip operation provides overload and short-circuit protection.
• Bolt-on mounting matches equipment designed to accept this NFJ breaker style.
• Rated 22k AIC at 480VAC and 25k AIC at 240VAC.
• 40°C rating for applications requiring this specified temperature rating.
• Load-side lug terminals are included, simplifying identification of the required terminal configuration.
• Also identified as NFJ424175, an important reference when checking older equipment documentation.
• Designed around form, fit, and functional compatibility with the appropriate NFJ application.

Technical Specifications

• Part Number: NFJ621175
  
• Alternate Part Number: NFJ424175
  
• Type: NFJ
  
• Breaker Type: Molded Case Circuit Breaker
  
• Amperage: 175A
  
• Poles: 2
  
• AIC Rating & Voltage: 22k @ 480VAC; 25k @ 240VAC
  
• Trip: Thermal Magnetic
  
• Mounting: Bolt-On
  
• Temperature Rating: 40°C
  
• Height: 9.31 in.
  
• Width: 4.13 in.
  
• Depth: 3.75 in.
  
• Terminals: Load-Side Lug Terminals Included
  

Material Compliance and Certifications

• The available specifications for the NFJ621175 do not include specific material compliance declarations, agency listings, or certification information. Rather than assume certifications, confirm these details from the breaker markings and applicable product documentation when required for installation.
• Also check the equipment requirements. The breaker should match the required electrical ratings, frame type, mounting arrangement, physical dimensions, and terminal configuration. Also consider applicable electrical codes and site requirements. A qualified electrical professional should make the final suitability determination.

Where It Works Best

• The NFJ621175 makes the most sense for existing electrical equipment designed for this particular NFJ breaker configuration. It's especially relevant for maintenance and replacement projects where the goal isn't to change the original equipment setup—you need the correct breaker specifications for the existing application.
• The alternate NFJ424175 part number can also help. Older maintenance records, equipment documentation, or the breaker being replaced may reference that number instead.
• One practical tip: don't choose a replacement breaker based on amperage or appearance alone. Check the complete specification. For the NFJ621175, that means confirming the 175A rating, two poles, NFJ type, bolt-on mounting, thermal-magnetic trip, AIC and voltage ratings, dimensions, and terminal arrangement against the equipment requirements.