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Westinghouse HFB1090 - Molded Case Breaker 90A 277V (1-Pole)

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Westinghouse HFB1090 is a single-pole molded case circuit breaker from the MARK 75 family, designed for thermal-magnetic overcurrent protection with long-time and instantaneous (LI) trip functions. It is rated for 90A continuous current at 277V AC, with a high interrupting capacity of 65kA at 277V. This bolt-on unit weighs 1 lb and features a compact HFB frame construction for secure panel mounting. It complies with Federal Specification W-C-375b requirements for reliable fault current interruption. Typical applications include branch circuit protection in industrial and commercial electrical distribution systems.

Key Features & Specifications
  • Manufacturer: Westinghouse
  • Item Subcategory: Molded Case
  • Family: MARK 75
  • Type: HFB
  • Weight: 1 lb
  • Functions: LI - Long-Time and Instantaneous
  • Voltage Rating: 277V
  • Poles: 1
  • Connection: Bolt-On
  • Protection: Thermal Magnetic
  • AIC rating: 65kA@277V
  • Phase: 1
  • Current Rating: 90A
  • Part Number: HFB1090
  • Frame/Series: HFB
  • Mounting Type: Bolt-On