NB31200 - 1200 Amp Circuit Breaker

NB31200 - 1200 Amp Circuit Breaker

The NB31200 is a 1200-amp, 3-pole thermal-magnetic circuit breaker for compatible NB-type electrical equipment. For replacement work, the details matter: this breaker is rated for 40°C, uses an interchangeable trip unit, and includes load-side terminals. Its interrupting ratings are 22k A.I.C. at 600VAC, 30k A.I.C. at 480VAC, and 42k A.I.C. at 240VAC. The breaker measures 16 inches high, 8.25 inches wide, and 5.5 inches deep. If you're maintaining older electrical equipment and need an NB31200, these dimensions and electrical ratings give you the information needed to compare it with the breaker already installed. It's a straightforward, built-to-last option for systems specifically designed around this type of breaker.

Key Features and Benefits

• 1200-amp rating for applications requiring this specific amperage.
• 3-pole design for compatible three-pole electrical systems.
• Uses a thermal magnetic trip mechanism.
• Interchangeable trip unit provides the configuration associated with the NB31200.
• Rated 22k A.I.C. at 600VAC.
• Rated 30k A.I.C. at 480VAC.
• Rated 42k A.I.C. at 240VAC.
• 40°C rated for applications calling for this temperature rating.
• Load-side terminals are included.
• Measures 16" H × 8.25" W × 5.5" D for checking physical fit.

Technical Specifications

• Part Number: NB31200
  
• Type: NB
  
• Breaker Type: Thermal Magnetic
  
• Amperage: 1200A
  
• Poles: 3
  
• A.I.C. Rating: 22k @ 600VAC
  
• A.I.C. Rating: 30k @ 480VAC
  
• A.I.C. Rating: 42k @ 240VAC
  
• Temperature Rating: 40°C
  
• Trip Unit: Interchangeable
  
• Load-Side Terminals: Included
  
• Height: 16.0 in.
  
• Width: 8.25 in.
  
• Depth: 5.5 in.
  

Material Compliance and Certifications

• No specific material compliance standards or third-party certifications were provided with the available NB31200 specifications. If a particular certification or listing is required for the installation, confirm it on the breaker nameplate and in the applicable equipment documentation.

Where It Works Best

• The NB31200 circuit breaker is intended for compatible legacy electrical systems that call for an NB-type 1200A, 3-pole thermal magnetic breaker. It's especially relevant for maintenance and replacement work where matching the existing breaker's physical size, trip configuration, amperage, voltage, and interrupting ratings matters.