NEB1B045B - 45Amp Circuit Breaker

NEB1B045B - 45 Amp Circuit Breaker

When you're replacing a breaker in an existing panelboard, the small details matter. The NEB1B045B is a 45-amp, 1-pole Type NEB molded-case circuit breaker intended for compatible panelboard applications. It has an interrupting rating of 35k AIC at 277VAC and 85k AIC at 120VAC, along with a 40°C rating and HACR rating. The breaker measures approximately 5.5 inches high, 1 inch wide, and 3 inches deep, so it's easy to compare its physical size with the breaker already in your equipment. It also comes with load-side terminals. For electricians and maintenance teams working on legacy equipment, the NEB1B045B can be a straightforward choice when the existing system calls for this specific breaker type, amperage, pole configuration, mounting style, and electrical ratings. It's built to last and designed to perform its intended circuit-protection function when properly matched to the application.

Key Features and Benefits

• 45-amp rating for compatible 45A circuit applications.
• 1-pole design for panelboards requiring this specific configuration.
• Type NEB molded-case construction for matching compatible existing equipment.
• Rated 35k AIC at 277VAC and 85k AIC at 120VAC.
• Panelboard-mount configuration suits the intended panelboard applications.
• HACR rated for applicable heating, air-conditioning, and refrigeration equipment installations.
• 40°C rating for easy comparison with system requirements.
• Load-side terminals included as part of the breaker configuration.
• Measures just 1 inch wide, an important detail when checking physical fit in an existing panelboard.
• Built for lasting service when correctly installed and operated within its specified ratings.

Technical Specifications

• Part Number: NEB1B045B
  
• Type: NEB
  
• Breaker Type: Molded Case Circuit Breaker
  
• Amperage: 45A
  
• Poles: 1
  
• A.I.C. Rating & Volts: 35k @ 277VAC; 85k @ 120VAC
  
• Temperature Rating: 40°C
  
• HACR Rated: Yes
  
• Mounting: Panelboard Mount
  
• Load-Side Terminals: Included
  
• Dimensions:
  • Height: 5.5 in.
  • Width: 1.0 in.
  • Depth: 3.0 in.

Material Compliance and Certifications

• The NEB1B045B is HACR-rated and rated for 40 °C. Its specified interrupting capacities are 35k AIC at 277VAC and 85k AIC at 120VAC.
• Additional certification, listing, or material-compliance requirements can vary by installation. Check the markings on the specific breaker and the applicable equipment documentation before installation rather than assuming compliance beyond the specifications listed here.

Where It Works Best

• The NEB1B045B makes the most sense in existing and legacy panelboard applications that require a 45A, single-pole Type NEB molded case circuit breaker with matching electrical and physical characteristics.
• Replacing an existing breaker? Check more than the amperage. Confirm the part number, number of poles, voltage, AIC rating, dimensions, mounting style, and terminal configuration against the equipment you're servicing. With legacy electrical systems in particular, matching the required form, fit, and function is key to selecting the correct breaker.