NEB1B040B - 40Amp Circuit Breaker

NEB1B040B - 40 Amp Circuit Breaker

Finding the right breaker for an existing panelboard usually comes down to the details. The NEB1B040B is a 40-amp, 1-pole Type NEB molded-case circuit breaker designed for panelboard mounting. It has an interrupting rating of 35k AIC at 277VAC and 85k AIC at 120VAC, along with a 40°C rating and HACR rating. Load-side terminals are included.

For replacement work, dimensions can matter as much as electrical ratings. The NEB1B040B measures 5.5 inches high, 1 inch wide, and 3 inches deep, giving electricians and maintenance teams clear measurements to compare with the existing installation. When the application calls for this NEB configuration, its 40A rating, single-pole design, panelboard mounting style, and specified interrupting ratings make it a straightforward choice for maintaining the required form, fit, and function of compatible equipment. It's a practical, built-to-last component for legacy electrical systems where matching the original specifications matters.

Key Features and Benefits

• 40A, 1-pole design for applications requiring this specific circuit configuration.
• Type NEB molded case construction for use with compatible electrical equipment.
• Rated 35k AIC at 277VAC and 85k AIC at 120VAC.
• Panelboard mount configuration.
• HACR rated for compatible heating, air-conditioning, and refrigeration applications.
• 40°C rating.
• Load-side terminals included.
• Compact 5.5" H x 1.0" W x 3.0" D dimensions make it easier to check physical compatibility before installation.
• Built to last when applied, installed, and maintained correctly.

Technical Specifications

• Part Number: NEB1B040B
  
• Product Type: Molded Case Circuit Breaker
  
• Type: NEB
  
• Amperage: 40A
  
• Poles: 1
  
• A.I.C. Rating & Volts: 35k @ 277VAC; 85k @ 120VAC
  
• Mounting: Panelboard Mount
  
• Temperature Rating: 40°C
  
• HACR Rated: Yes
  
• Load-Side Terminals: Included
  
• Dimensions:
  • Height: 5.5 in.
  • Width: 1.0 in.
  • Depth: 3.0 in.

Material Compliance and Certifications

• The NEB1B040B is HACR rated and carries a stated 40°C rating. The available specifications did not include additional material-compliance or certification information, so no additional certifications are claimed here. If a project has specific certification or material-compliance requirements, confirm those details against the applicable product documentation.

Where It Works Best

• The NEB1B040B is intended for compatible panelboards and legacy electrical distribution systems that require its particular Type NEB configuration. It's well suited to maintenance and replacement situations where the goal is to keep the existing equipment configuration intact.
• A 40-amp rating alone doesn't determine whether a breaker is the right fit. For an existing installation, check the part number, breaker type, number of poles, physical dimensions, mounting arrangement, system voltage, AIC rating, and terminal configuration. Those details help determine whether the NEB1B040B matches the requirements of the equipment you're working with.
• As with any molded case circuit breaker replacement, verify compatibility against the panelboard and electrical system requirements before installation. Follow applicable electrical codes and have a qualified electrical professional perform the installation.