NEB3B125B - 125Amp Circuit Breaker

NEB3B125B - 125Amp Circuit Breaker

When you're replacing a breaker in an existing panel, matching the specifications matters. The NEB3B125B is a 125A, 3-pole molded-case circuit breaker from the NEB type, designed for panelboard mounting in compatible electrical equipment. It has an interrupting rating of 35 kAIC at 480VAC and 85 kAIC at 240VAC, along with a 40°C rating and HACR rating. Load-side terminals are included. At 5.5 inches high, 3 inches wide, and 3 inches deep, the NEB3B125B suits applications that require this breaker size, mounting arrangement, and electrical configuration. It's a straightforward choice for maintaining compatible legacy electrical systems—especially when the job calls for matching the existing breaker's form, fit, and function. It's also built to last under the demands of its intended application.

Key Features and Benefits

• 125A rating for applications designed around this amperage.
• Three-pole design for compatible three-phase electrical systems.
• 35k AIC at 480VAC and 85k AIC at 240VAC.
• Panelboard mount configuration for compatible equipment.
• HACR rated for applications where this rating is specified.
• 40°C rated.
• Load-side terminals included.
• Compact 5.5" x 3" x 3" dimensions make it easier to confirm physical fit when replacing an existing breaker.
• Designed with the straightforward, durable construction expected of a molded case circuit breaker.
  

Technical Specifications

• Part Number: NEB3B125B
  
• Type: NEB
  
• Product: Molded Case Circuit Breaker
  
• Amperage: 125A
  
• Poles: 3
  
• AIC / Voltage Rating: 35k @ 480VAC; 85k @ 240VAC
  
• Mounting: Panelboard Mount
  
• Temperature Rating: 40°C
  
• HACR Rated: Yes
  
• Load-Side Terminals: Included
  
• Height: 5.5 in.
  
• Width: 3.0 in.
  
• Depth: 3.0 in.
  

Material Compliance and Certifications

• The NEB3B125B is HACR-rated and has a specified 40°C rating. Additional material-compliance or certification information isn't included in the available specifications, so we assume none.
• Always check the panelboard and electrical system requirements before using a replacement breaker. Also follow applicable electrical codes, equipment listings, and installation requirements.
  

Where It Works Best

• The NEB3B125B makes the most sense in existing panelboard installations that require a Type NEB, 125A, 3-pole breaker with matching electrical and physical specifications. This can include maintenance and replacement work in commercial, industrial, and other electrical distribution applications where compatible NEB equipment is already in service.
• For replacement work, don't rely on amperage alone. Check the part number, breaker type, number of poles, voltage, interrupting rating, dimensions, and mounting configuration against the existing equipment. Getting those details right is the key to finding the proper form, fit, and functional replacement.