Eaton Cutler-Hammer HFD1020 BU Circuit Breaker

Eaton Cutler-Hammer HFD1020 BU is a 1P, 20A, 277V circuit breaker. As a single-pole device, it interrupts current on one hot conductor when an overcurrent occurs, providing protection for the associated branch circuit and connected loads. The HFD1020 BU designation identifies this specific variant within Eaton’s Cutler-Hammer HFD1020 family, helping to distinguish form factor and replacement options. With a 277V AC rating, this breaker is intended for applications where circuits operate at 277 volts, a common voltage level in certain commercial or industrial electrical distributions. It is rated to protect circuits up to 20 amperes, making it suitable for lightweight branch circuits that require this level of overcurrent protection. 1P configuration means it protects a single hot conductor, a common arrangement for individual circuit segments in commercial wiring. While this description focuses on the core ratings, the 20A/277V specification defines the maximum load and voltage this device is designed to interrupt.