NEB1B050B - 50Amp Circuit Breaker

NEB1B050B - 50 Amp Circuit Breaker

When you're replacing a breaker in an existing panelboard, the small details can make a big difference. The NEB1B050B is a 50-amp, 1-pole Type NEB molded-case circuit breaker made for panelboard-mounted applications. It is rated 35k AIC at 277VAC and 85k AIC at 120VAC, with a 40°C rating and HACR rating. The breaker measures approximately 5.5 inches high, 1 inch wide, and 3 inches deep, and it includes load-side terminals. For maintenance and replacement work involving compatible NEB equipment, these specifications make it easier to check the breaker against the unit already installed. Rather than relying on amperage alone, compare the part number, pole configuration, voltage, interrupting capacity, dimensions, mounting style, and terminals. If your existing equipment calls for an NEB1B050B circuit breaker, this unit provides the corresponding form, fit, and functional characteristics needed for that application. It's a straightforward electrical component that's built to last when properly installed and used within its specified ratings.

Key Features and Benefits

• 50-amp rating for compatible 50A electrical applications.
• Single-pole design matches systems requiring a 1-pole breaker.
• Type NEB molded case construction for compatible NEB panelboard applications.
• Rated 35k AIC at 277VAC and 85k AIC at 120VAC.
• Panelboard mount configuration for the intended equipment setup.
• HACR-rated for applications that specifically require this designation.
• 40°C rated according to the available product specifications.
• Load-side terminals included as part of the breaker configuration.
• Compact 5.5" H × 1.0" W × 3.0" D dimensions help with checking physical fit.
• Built for lasting service when correctly matched to the equipment and application.

Technical Specifications

• Part Number: NEB1B050B
  
• Product Type: Molded Case Circuit Breaker
  
• Type: NEB
  
• Amperage: 50 Amps
  
• Poles: 1
  
• AIC Rating: 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

• Based on the available specifications, the NEB1B050B is HACR rated and carries a 40°C temperature rating. It uses a molded case design and is configured for panelboard mounting.
• For any installation with specific listing, certification, or material-compliance requirements, check those requirements against the equipment documentation and the installation itself. Never determine electrical compatibility from amperage or physical size alone.

Where It Works Best

• The NEB1B050B is intended for compatible panelboards and existing electrical equipment designed around Type NEB molded case circuit breakers. It's especially relevant for servicing legacy equipment where maintaining the original breaker configuration matters.
• If you're replacing an existing breaker, start with the part number and then check the rest of the specifications. This model is 50 amps and 1 pole, measures 5.5" × 1.0" × 3.0", mounts in a panelboard, and includes load-side terminals. Its interrupting ratings are 35k AIC at 277VAC and 85k AIC at 120VAC.
• Those details matter. A breaker can look similar and still have different electrical or mounting specifications. Confirming the NEB1B050B part number, ratings, dimensions, pole count, and mounting configuration helps ensure the breaker meets the existing system's requirements.