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Square D NQB3B040 - 40A 3-Pole Molded Case Circuit Breaker

United Fuses
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NQB3B040 is a molded case circuit breaker designed for overcurrent protection in industrial power distribution systems. It is rated for 480V AC and 40A, providing reliable interruption of fault currents. The breaker weighs 5.19 lb and features a compact construction suitable for panelboard installation. It complies with UL 489 standards for safety and performance. This breaker is typically used in commercial and industrial electrical panels for branch circuit protection.

Key Features & Specifications
  • Type: Molded case circuit breaker, thermal-magnetic trip, non-interchangeable trip unit
  • Voltage Rating: 480V AC
  • Current Rating: 40A
  • Weight: 5.19 lb
  • Standards: UL 489
  • Applications: Branch circuit protection in commercial and industrial panelboards
  • Breaker Type: NQB
  • Frame Size: 100A frame
  • Poles: 3
  • Phase: 3
  • Connection: Line and load side lugs
  • Mounting: Bolt-on
  • Frequency Rating: 50/60 Hz
  • AIC Rating: 14 kA at 480V AC
  • Terminal Connection: Copper/aluminum rated
  • Installation Type: Panelboard
  • Circuit Breaker Mounting Style: Bolt-on
  • Compatible Frames: NQ series panelboards