In power systems, circuit breakers and disconnectors (isolating switches) are two types of essential switchgear with distinct functions yet inseparable roles. From photovoltaic plants and substations to industrial facilities and home distribution panels, both are indispensable. Although their appearances may cause confusion, their purposes diverge sharply: one focuses on protection and control, while the other specializes in isolation and safety. This article will strictly follow the defined structure to clearly dissect their core differences across definitions, detailed distinctions, and application scenarios, helping readers accurately identify and appropriately select each device.