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HNB310000TM

Westinghouse
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Westinghouse HNB310000TM Circuit Breaker - MARK 75 Trip Unit (600V, 1200A) The Westinghouse HNB310000TM is a Type HNB molded case circuit breaker from the MARK 75 family, designed for instantaneous magnetic-only protection in industrial power systems. This 3-pole unit is rated for 600V AC with a fixed 1200 amp current rating, providing reliable overcurrent interruption without thermal delay. Weighing 4 lb, it features a compact construction compatible with NB, HNB, and NBY frames for bolt-on panel mounting. The circuit breaker meets industry standards for magnetic-only protection, ensuring precise response to short-circuit conditions in high-demand environments. Typical applications include motor control centers, switchboards, and distribution panels requiring instantaneous trip functionality.

Key Features & Specifications
  • Manufacturer: Westinghouse
  • Item Subcategory: Trip Units & Programmers
  • Family: MARK 75
  • Type: HNB
  • Weight: 4 lb
  • Functions: I - Instantaneous
  • Voltage Rating: 600V
  • Poles: 3
  • Amperage Minimum: 1200
  • Protection: Magnetic Only
  • Compatible Frames: NB, HNB, NBY
  • Amperage Maximum: 1200
  • Amperage Rating: 1000 amps
  • Mounting: Bolt-on
  • Interrupt Rating: 35kA at 480V
  • Trip Unit: Thermal Magnetic