NEB3B045B - 45Amp Circuit Breaker

NEB3B045B - 45Amp Circuit Breaker

When you're replacing a breaker in an existing panelboard, getting the details right matters. The NEB3B045B is a 45-amp, 3-pole molded case circuit breaker with a Type NEB configuration, intended for use in compatible panelboard applications. It carries an interrupting rating of 35 kAIC at 480VAC and 85 kAIC at 240VAC. The breaker is also HACR rated for heating, air-conditioning, and refrigeration applications and has a 40°C rating.

Physically, the NEB3B045B measures approximately 5.5 inches high by 3 inches wide by 3 inches deep. It is designed for panelboard mounting and comes with load-side terminals. Check those details carefully when replacing an existing breaker, especially in older electrical equipment where dimensions, mounting style, and connection arrangements must match the original installation.

For maintenance work, the objective is simple: find a breaker that matches what the equipment calls for. If the existing system specifies an NEB3B045B, compare the part number, amperage, poles, AIC rating, dimensions, mounting arrangement, and terminals. When all requirements match, this breaker provides the form, fit, and function needed to keep compatible legacy equipment in service. It's a straightforward molded case breaker, built to last and designed for its intended application.

Key Features and Benefits

• 45-amp rating for applications specifically designed around this amperage.
• Three-pole design for compatible three-phase electrical applications.
• Type NEB configuration for panelboards designed to accept this breaker type.
• Rated 35 kAIC at 480VAC and 85 kAIC at 240VAC.
• Panelboard-mount configuration for compatible equipment.
• HACR rated for applicable heating, air-conditioning, and refrigeration installations.
• 40°C rated.
• Load-side terminals included.
• Compact 5.5" x 3" x 3" dimensions make it easier to compare the breaker with the unit being replaced.
• Well suited to maintenance and replacement work where retaining the required original breaker configuration is important.
  

Technical Specifications

• Part Number: NEB3B045B
  
• Breaker Type: Molded Case Circuit Breaker
  
• Type / Series: NEB
  
• Amperage: 45A
  
• Poles: 3
  
• A.I.C. 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 available specifications identify the NEB3B045B as HACR-rated and specify a 40°C rating. The information provided for this breaker lists no additional material-compliance certifications, so none are claimed here.
• Electrical requirements can vary by equipment and installation. Check the applicable panelboard documentation, electrical drawings, and code requirements before installing the breaker.
  

Where It Works Best

• The NEB3B045B makes the most sense in existing panelboards and legacy electrical systems that were designed for a Type NEB, 45 amp, three-pole molded case circuit breaker. It's particularly relevant for maintenance and repair jobs where changing the original panelboard configuration isn't the goal—you simply need the correct breaker for the equipment already in place.
• Don't rely on the part number alone when checking compatibility. Compare the 45A rating, three-pole configuration, AIC rating, physical size, panelboard mounting style, and terminal arrangement with the existing breaker and the equipment specifications. Matching those details helps ensure the breaker fits the intended application.