PB31200 - 1200Amp Circuit Breaker

PB31200 - 1200Amp Circuit Breaker

Need to match a PB31200 circuit breaker already installed in your electrical equipment? Start with the details that matter most. The PB31200 is a 1200-amp, 3-pole thermal-magnetic circuit breaker with a rear-connected design. It is rated 100k AIC at 600VAC, 100k AIC at 480VAC, and 125k AIC at 240VAC, with a 40°C rating. For maintenance work on existing electrical systems, those specifications matter because a replacement breaker must match more than amperage alone. Connection style, dimensions, pole count, voltage, and interrupting rating must match the equipment's requirements. At 22.13 inches high, 12.06 inches wide, and 9.06 inches deep, the PB31200 has a clearly defined footprint that you can check against the existing installation. Its thermal magnetic design provides overload and short-circuit protection when used within its specified ratings. For facilities built around Type PB equipment, the PB31200 can provide the form, fit, and function needed to keep an existing system operating as intended. It's a straightforward, purpose-built circuit breaker that's made to last when correctly applied, installed, and maintained.

Key Features and Benefits

• 1200 amp rating for compatible electrical distribution applications.
• Three-pole configuration for systems designed around a 3-pole breaker.
• Thermal magnetic trip design provides overload and short-circuit protection.
• Rear-connected construction for equipment requiring this specific connection arrangement.
• Rated 100k AIC at 600VAC and 480VAC, and 125k AIC at 240VAC.
• 40°C rated for applications requiring this temperature rating.
• Clearly defined dimensions make it easier to check physical fit before installation.
• Well suited for form, fit, and functional replacement in compatible legacy Type PB equipment.
• Built to last when installed and operated within its intended ratings and application.

Technical Specifications

• Part Number: PB31200
  
• Type: PB
  
• Breaker Type: Thermal Magnetic
  
• Amperage: 1200 Amps
  
• Poles: 3
  
• AIC @ 600VAC: 100k
  
• AIC @ 480VAC: 100k
  
• AIC @ 240VAC: 125k
  
• Connection: Rear-connected
  
• Temperature Rating: 40°C
  
• Dimensions:
  • Height: 22.13 in.
  • Width: 12.06 in.
  • Depth: 9.06 in.

Material Compliance and Certifications

• The available PB31200 specifications did not include material compliance and certification information. If a particular certification, material standard, or regulatory requirement applies to your installation, confirm the appropriate documentation for the breaker and equipment before installation.
  Perform electrical work in accordance with applicable codes, equipment requirements, and established electrical practices.

Where It Works Best

• The PB31200 makes the most sense in existing electrical distribution equipment that was designed for its particular Type PB configuration. It's especially relevant for maintenance and replacement projects where changing the surrounding equipment isn't the objective—the goal is to find a breaker with the correct 1200A rating, three-pole arrangement, rear connection, dimensions, and interrupting ratings.
• Before considering it a match, compare the PB31200 specifications with the breaker being replaced and the equipment requirements. Don't go by amperage or appearance alone. Also check the breaker type, poles, connection style, voltage, AIC rating, physical dimensions, and 40°C rating. When those details match the application, the PB31200 can serve as a practical form, fit, and functional replacement for compatible legacy electrical equipment.