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Westinghouse HFB1040 - Molded Case Circuit Breaker 40A 277V

Westinghouse
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Westinghouse HFB1040 is a 1-pole molded case circuit breaker from the MARK 75 family, designed for overcurrent protection in low-voltage electrical systems. It is rated for 277V AC and 40A, with a 65kA interrupting capacity at 277V, and utilizes thermal magnetic protection with LI (Long-Time and Instantaneous) trip functions. The unit features a bolt-on connection, weighs 1 lb, and is constructed for single-phase applications. This breaker complies with industry standards for molded case circuit breakers. It is suited for use in industrial electrical panels and distribution systems requiring reliable circuit isolation and fault protection.

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: 40A
  • Amperage Rating: 40 Amps
  • Voltage Rating: 277V AC
  • Poles: 1
  • Mounting Type: Bolt-On
  • Interrupt Rating: 65kA at 277V
  • Trip Unit: Thermal Magnetic
  • Frame Type: HFB
  • Continuous Rating: 40 degrees Celsius
  • Lug Size: #12 - 1/0 Cu/Al