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Westinghouse HNB31200T - Trip Unit 1200A 600V 3-Pole

Cutler Hammer
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Westinghouse HNB31200T is a thermal magnetic trip unit designed for use with NB, HNB, and NBY circuit breaker frames, providing long-time and instantaneous (LI) protection against overloads and short circuits. This three-pole unit is rated for 1200 amperes at 600 volts AC, offering robust overcurrent protection for high-capacity industrial circuits. The trip unit measures 10.25 inches in depth, 7 inches in height, and 5.25 inches in width, weighing 5.12 lb, and is constructed as a solid-state, field-interchangeable component from the MARK 75 family. It is UL Listed, ensuring compliance with North American safety and performance standards for electrical distribution equipment. This trip unit is typically applied in industrial power distribution systems, switchboards, and motor control centers requiring precise, adjustable protection for large electrical loads.

Key Features & Specifications
  • Type: Thermal Magnetic Trip Unit, LI (Long-Time and Instantaneous) functions
  • Voltage Rating: 600V AC
  • Current Rating: 1200 Amperes (Minimum and Maximum)
  • Dimensions: 10.25 in x 7 in x 5.25 in (Length/Depth x Height x Width)
  • Standards: UL Listed
  • Applications: Industrial power distribution, switchboards, motor control centers
  • Poles: 3
  • Protection: Thermal Magnetic
  • Functions: LI - Long-Time and Instantaneous
  • Compatible Frames: NB, HNB, NBY
  • Weight: 5.12 lb
  • Family: MARK 75
  • Country of Origin: United States


Product Identification
  • UPC: 786679192375
  • GTIN: 00786679192375