NB31000 - 1000 Amp Circuit Breaker

NB31000 - 1000 Amp Circuit Breaker

The NB31000 is a 1000-amp, 3-pole thermal-magnetic circuit breaker for compatible electrical distribution equipment. If you're replacing a breaker in an existing or legacy system, getting the details right matters. This NB-type breaker measures 16 inches high, 8.25 inches wide, and 5.5 inches deep, and includes load-side terminals. It also uses an interchangeable trip unit and is rated for operation at 40°C. Interrupting capacity varies by system voltage: 22k AIC at 600VAC, 30k AIC at 480VAC, and 42k AIC at 240VAC. For maintenance and replacement work, the NB31000 gives electricians and facility teams a clearly defined set of specifications to match against existing equipment. It's built to last for its intended application, but as with any replacement circuit breaker, check the complete electrical and physical specifications before installation.

Key Features and Benefits

• 1000A rating for applications requiring this specific current capacity.
• 3-pole design for compatible three-phase electrical systems.
• Thermal-magnetic operation provides overload and short-circuit protection.
• Interchangeable trip unit for systems designed around this configuration.
• 40°C rated for the specified operating conditions.
• 22k AIC at 600VAC, 30k AIC at 480VAC, and 42k AIC at 240VAC.
• Load-side terminals are included.
• Clearly defined dimensions help simplify form-and-fit checks during replacement work.
• Built to last when properly applied and operated within its specified ratings.

Technical Specifications

• Part Number: NB31000
  
• Type: NB
  
• Amperage: 1000A
  
• Poles: 3
  
• Protection: Thermal Magnetic
  
• Trip Unit: Interchangeable
  
• Temperature Rating: 40°C
  
• AIC @ 600VAC: 22k
  
• AIC @ 480VAC: 30k
  
• AIC @ 240VAC: 42k
  
• Height: 16.0 in.
  
• Width: 8.25 in.
  
• Depth: 5.5 in.
  
• Load-Side Terminals: Included
  

Material Compliance and Certifications

• The available specifications do not include specific material compliance information or third-party certifications for the NB31000. UL, CSA, RoHS, or other certification status should not be assumed. If a particular listing or compliance standard is required, confirm it on the product label and in applicable manufacturer documentation.

Where It Works Best

• The NB31000 circuit breaker makes the most sense for maintaining compatible legacy electrical equipment that requires an NB-type, 1000A, 3-pole thermal-magnetic breaker. It's especially relevant when you're trying to preserve the existing equipment configuration rather than change the system around it.
• Before using the NB31000 as a replacement, compare more than the amperage and part number. Also check the voltage, AIC rating, pole count, trip characteristics, dimensions, terminal arrangement, and equipment requirements. Those details determine whether the breaker provides the required form, fit, and function for the application. Qualified electrical personnel should handle installation and final compatibility verification.