NGB2B040B - 40 Amp Circuit Breaker

NGB2B040B - 40 Amp Circuit Breaker

When you're replacing a circuit breaker in an existing panelboard, getting the details right matters. The NGB2B040B is a 40-amp, 2-pole Type NGB molded-case circuit breaker designed for compatible panelboard applications. It carries an interrupting rating of 25k AIC at 480VAC and 100k AIC at 240VAC and measures 5.0 inches high, 2.0 inches wide, and 3.06 inches deep. It's also HACR-rated, has a 40.25°C rating, and includes load-side terminals. For maintenance work on an existing electrical system, the NGB2B040B is a practical option when these ratings, dimensions, and mounting requirements match the equipment already in place. Instead of changing the panel configuration, you can focus on finding the right form, fit, and function for the original application. This is a straightforward breaker built to last and designed to do the job it was made for.

Key Features and Benefits

• 40-amp rating for applications that require a 40A breaker.
• 2-pole design for compatible two-pole circuits.
• Type NGB molded case construction for equipment designed to accept this breaker type.
• Rated 25k AIC at 480VAC and 100k AIC at 240VAC.
• Panelboard mount configuration for compatible installations.
• HACR rated for applications requiring an HACR-rated breaker.
• Includes load-side terminals to match the intended connection setup.
• Measures 5.0" H x 2.0" W x 3.06" D, making it easier to check physical fit before installation.
• Built to last when properly installed and used within its specified electrical ratings.

Technical Specifications

• Part Number NGB2B040B
  
• Type NGB
  
• Product Type Molded Case Circuit Breaker
  
• Amperage 40A
  
• Poles 2
  
• AIC Rating & Voltage 25k @ 480VAC; 100k @ 240VAC
  
• Temperature Rating 40.25°C
  
• HACR Rated Yes
  
• Mounting Panelboard Mount
  
• Load-Side Terminals Included
  
• Height 5.0 in.
  
• Width 2.0 in.
  
• Depth 3.06 in.
  

Material Compliance and Certifications

• The NGB2B040B is HACR rated and carries a 40.25°C rating. No additional material compliance or certification information is specified here, so verify additional certifications from the product markings or applicable documentation when required for a particular installation.
• As with any replacement circuit breaker, don't rely on amperage alone when checking compatibility. The breaker type, number of poles, voltage and interrupting ratings, mounting arrangement, dimensions, and terminal configuration should match the equipment requirements.
  

Where It Works Best

• The NGB2B040B 40A 2-pole circuit breaker is best suited for compatible panelboards and existing electrical systems designed around the Type NGB breaker configuration. It makes sense for maintenance and replacement projects where keeping the original equipment configuration is important.
• If you're matching an existing breaker, check more than the part number. Compare the 40A rating, two-pole configuration, AIC ratings, physical dimensions, panelboard mounting, and terminal requirements with the breaker being replaced and the equipment specifications. When those details match, the NGB2B040B provides the form, fit, and function required for its intended application.