PB3900 - 900 Amp Circuit Breaker

PB3900 - 900 Amp Circuit Breaker

When you're replacing a circuit breaker in an existing electrical system, getting the details right matters. The PB3900 is a Type PB, 900A, 3-pole thermal-magnetic circuit breaker with a rear-connected design and a 40°C rating. Its interrupting capacity is 100k AIC at 600VAC, 100k AIC at 480VAC, and 125k AIC at 240VAC. The breaker measures 22.13 inches high, 12.06 inches wide, and 9.06 inches deep. Those dimensions, along with the amperage, pole count, connection style, and interrupting ratings, are important when matching a breaker to compatible legacy equipment. The thermal-magnetic design responds to sustained overloads as well as short-circuit conditions. For facilities that maintain equipment designed around the PB3900 configuration, this breaker provides the specific form, fit, and function needed for the application. It's a straightforward, built-to-last solution when your existing system calls for the PB3900.

Key Features and Benefits

• 900A, 3-pole configuration for compatible electrical distribution applications.
• Thermal-magnetic operation provides overload and short-circuit protection.
• Rear-connected, making the connection style an important part of confirming compatibility.
• Rated 100k AIC at 600VAC and 480VAC, with a 125k AIC rating at 240VAC.
• 40°C rated for applications designed around this temperature rating.
• Dimensions of 22.13" H x 12.06" W x 9.06" D help when checking fit within existing equipment.
• Well suited to legacy electrical systems that specifically require the PB3900's ratings and configuration.
• Built to last for its intended electrical distribution application.

Technical Specifications

• Part Number: PB3900
  
• Type: PB
  
• Breaker Type: Thermal Magnetic
  
• Amperage: 900A
  
• Poles: 3
  
• AIC @ 600VAC: 100k
  
• AIC @ 480VAC: 100k
  
• AIC @ 240VAC: 125k
  
• Connection: Rear-connected
  
• Temperature Rating: 40°C
  
• Height: 22.13 in.
  
• Width: 12.06 in.
  
• Depth: 9.06 in.
  

Material Compliance and Certifications

• Specific material compliance information and certifications were not provided in the available specifications for the PB3900. For applications that require a particular certification, listing, or material standard, check the breaker nameplate and applicable equipment documentation before installation.

Where It Works Best

• The PB3900 makes the most sense for existing electrical distribution equipment designed for a 900A, 3-pole, Type PB thermal-magnetic circuit breaker with rear connections. This is especially important with legacy systems, where the physical fit and connection arrangement can matter just as much as the electrical ratings.
  
• Before using the PB3900 as a replacement, carefully compare the existing breaker and equipment requirements. Check the part number, amperage, number of poles, voltage, and AIC ratings, dimensions, 40°C rating, and rear-connected configuration. A qualified electrical professional should confirm compatibility and installation requirements for the specific application.