NGB1B040B - 40 Amp Circuit Breaker

NGB1B040B - 40 Amp Circuit Breaker

If you're looking for an NGB1B040B, you likely already have a panelboard or electrical system that calls for this specific breaker. The NGB1B040B is a 40-amp, 1-pole NGB molded-case circuit breaker made for panelboard mounting. It has an interrupting rating of 25kA at 277VAC and 100kA at 120VAC, and it's also HACR rated. The breaker measures 5.0 inches high, 1.0 inch wide, and 3.06 inches deep, and includes load-side terminals. Those details matter most when you're replacing a breaker in existing or legacy equipment, where simply finding another 40-amp breaker isn't enough. The mounting style, dimensions, number of poles, voltage, and interrupting rating must match the application. For equipment designed around the NGB1B040B, this breaker lets electricians and maintenance teams maintain the original system's intended form, fit, and function. Its molded-case construction is straightforward and built to last when properly installed and used within its stated ratings.

Key Features and Benefits

• 40-amp, 1-pole breaker for compatible NGB applications.
• 25kA at 277VAC and 100kA at 120VAC A.I.C. ratings.
• Panelboard-mount configuration for equipment designed to accept this breaker style.
• HACR rated for compatible heating, air-conditioning, and refrigeration applications where this rating is required.
• Load-side terminals included as part of the breaker configuration.
• At 5.0" H x 1.0" W x 3.06" D, its dimensions can be checked directly against the existing breaker and panelboard space.
• Molded case construction designed for use within the breaker's specified electrical ratings.
• A useful form, fit, and functional replacement when the existing equipment specifically requires an NGB1B040B.

Technical Specifications

• Part Number: NGB1B040B
  
• Type: NGB
  
• Product Type: Molded Case Circuit Breaker
  
• Amperage: 40A
  
• Poles: 1
  
• A.I.C. Rating & Volts: 25kA @ 277VAC; 100kA @ 120VAC
  
• Height: 5.0 in.
  
• Width: 1.0 in.
  
• Depth: 3.06 in.
  
• Mounting: Panelboard Mount
  
• Temperature Rating: 40.25°C
  
• HACR Rated: Yes
  
• Terminals: Load-Side Terminals Included
  

Material Compliance and Certifications

• The available specifications identify the NGB1B040B as HACR rated. No other material-compliance designations or certifications were provided for this part, so we don't assume undocumented ratings.
• If your application has specific code, listing, or compliance requirements, check the markings on the breaker and confirm them against the panelboard or equipment documentation before installation.

Where It Works Best

• The NGB1B040B is best suited to existing and legacy panelboard installations that specifically call for an NGB-type, 40 amp, single-pole molded case circuit breaker with these ratings and dimensions. It's also suitable for compatible HACR applications when the equipment specifies a breaker with these characteristics.
• One thing worth checking before replacing any breaker: amperage isn't the whole story. A 40 amp rating alone doesn't establish compatibility. Check the part number, breaker type, pole count, voltage, and A.I.C. ratings, physical dimensions, mounting style, and terminal configuration against the equipment you're working on.