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Westinghouse NB3900T - Trip Unit 900A 600V 3-Pole

Westinghouse
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Westinghouse NB3900T is a thermal magnetic trip unit designed for overcurrent protection in industrial power distribution systems. It operates at a voltage rating of 600V with a current range of 900A minimum to 900A maximum, providing LI (Long-Time and Instantaneous) protection functions. The unit weighs 4 lb and is constructed for integration into NB, HNB, and NBY compatible frames. It complies with industry standards for thermal magnetic circuit breaker components. This trip unit is typically applied in three-phase industrial switchgear and panelboard installations requiring precise overcurrent coordination.

Key Features & Specifications
  • Type: Thermal Magnetic Trip Unit
  • Voltage Rating: 600V
  • Current Rating: 900A (Minimum 900A, Maximum 900A)
  • Poles: 3
  • Functions: LI - Long-Time and Instantaneous
  • Protection: Thermal Magnetic
  • Compatible Frames: NB, HNB, NBY
  • Weight: 4 lb
  • Family: NB Series
  • Item Subcategory: Trip Units & Programmers


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