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Cutler Hammer HNB3900T - Thermal Magnetic Trip Unit 900A 600V

Cutler Hammer
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Cutler Hammer HNB3900T is a thermal magnetic circuit breaker trip unit designed for providing reliable overcurrent protection in industrial power distribution systems. It features a 600V AC voltage rating and a fixed 900A current rating for consistent circuit interruption. The unit is constructed with a robust housing measuring 18 x 17.1 x 10.5 inches (L x H x W) and weighing 26 lb, and it provides LI (Long-time and Instantaneous) protection functions. It is engineered for compliance with industry standards and is typically applied within switchgear and panelboards requiring precise protection coordination for high-amperage three-phase circuits.

Key Features & Specifications
  • Type: Thermal Magnetic Trip Unit, HNB Type
  • Voltage Rating: 600V AC
  • Current Rating: 900A Fixed
  • Dimensions: 18 in x 17.1 in x 10.5 in (Length x Height x Width)
  • Weight: 26 lb
  • Standards: Industry Standard Compliance
  • Applications: Industrial Power Distribution, Switchgear, Panelboards
  • Functions: LI - Long-Time and Instantaneous Protection
  • Poles: 3
  • Protection: Thermal Magnetic
  • Compatible Frames: NB, HNB, NBY
  • Family: MARK 75
  • Item Subcategory: Trip Units & Programmers


Product Identification
  • UPC: 786679192566
  • GTIN: 00786679192566