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Westinghouse HFB1090 - Molded Case 90A 277V 1-Pole

Cutler Hammer
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Westinghouse HFB1090 is a 1-pole, 90A molded case circuit breaker designed for thermal-magnetic overcurrent protection with long-time and instantaneous (LI) trip functions. It is rated for 277V AC, single-phase operation, and delivers a 65kA interrupting capacity at 277V. This bolt-on unit weighs 1 lb and is part of the MARK 75 family, featuring a compact molded case construction for panelboard installation. It complies with industry standards for industrial and commercial electrical distribution systems, providing reliable protection in lighting, power, and motor control applications.

Key Features & Specifications
  • Type: Molded Case
  • Voltage Rating: 277V
  • Current Rating: 90A
  • Poles: 1
  • Phase: 1
  • Connection: Bolt-On
  • Protection: Thermal Magnetic
  • AIC rating: 65kA@277V
  • Functions: LI - Long-Time and Instantaneous
  • Family: MARK 75
  • Weight: 1 lb
  • Standards: Industry standard for panelboard installation
  • Applications: Industrial and commercial electrical distribution, lighting, power, motor control


Product Identification
  • UPC: Not specified
  • GTIN: Not specified