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NEB3B050

Siemens
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Siemens NEB3B050 is a 3-pole molded case circuit breaker from the NEB Series, designed for overcurrent protection in commercial and industrial power distribution systems. This 50A unit operates at 600V with a thermal magnetic trip unit providing LI (Long-Time and Instantaneous) functions, and features a bolt-on connection for secure installation in panelboards and switchgear. The breaker weighs 3 lb and is rated for a 35kA interrupting capacity at 480V, ensuring robust fault current handling in 3-phase applications. It complies with UL standards for reliable circuit protection. Typical applications include protecting branch circuits and feeders in industrial control panels, lighting panels, and distribution switchboards.

Key Features & Specifications
  • Manufacturer: Siemens
  • Item Subcategory: Molded Case
  • Family: NEB Series
  • Type: NEB
  • Weight: 3 lb
  • Functions: LI - Long-Time and Instantaneous
  • Voltage Rating: 600V
  • Poles: 3
  • Connection: Bolt-On
  • Protection: Thermal Magnetic
  • AIC rating: 35kA@480V
  • Phase: 3
  • Current Rating: 50A
  • Part Number: NEB3B050
  • Series/Frame: NEB
  • Amperage: 50A
  • Mounting Type: Bolt-On
  • Interrupt Rating: 35kA@480V
  • Trip Unit: Thermal Magnetic
  • Protection Type: Overcurrent
  • Application: Panelboard, Switchgear
  • Standards: UL Listed


Siemens NEB3B050 - Molded Case Breaker 50A 600V 3-Pole