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Westinghouse HFB1045 - Molded Case Circuit Breaker 45A 1P (65kA AIC)

Westinghouse
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Westinghouse HFB1045 is a molded case circuit breaker designed for providing reliable overcurrent protection in industrial and commercial electrical systems. It features a 45A current rating and a 277V AC voltage rating, engineered within a compact, single-pole bolt-on configuration with a durable thermal-magnetic trip unit for combined long-time and instantaneous (LI) protection functions. This unit is constructed with robust materials, weighs 1 lb, and complies with industry standards for safety and performance, including an interrupting capacity of 65kA at 277V. It is typically applied in panelboards, switchboards, and motor control centers for branch circuit protection.

Key Features & Specifications
  • Type: Molded Case Circuit Breaker, HFB Type, Thermal-Magnetic Protection, Bolt-On Connection
  • Voltage Rating: 277V AC
  • Current Rating: 45A
  • Poles: 1
  • Phase: 1
  • AIC Rating: 65kA @ 277V
  • Protection Functions: LI (Long-Time and Instantaneous)
  • Family: MARK 75
  • Weight: 1 lb