An isolating switch (commonly referred to as a disconnector) is a specialized device in electrical engineering designed to safely separate circuits, creating a de-energized environment during equipment maintenance or system servicing. Its core function lies in providing a visible physical breakpoint to confirm circuit separation, ensuring personnel safety by eliminating residual current risks. Widely used in power transmission systems, industrial control terminals, and energy facilities, it is particularly critical for scenarios requiring power disconnection during mechanical adjustments or component replacements. Typical designs feature a rotary operating lever, insulation protection components, and visual open/close indicators, with advanced models incorporating grounding interlock functionality to enhance safety by connecting isolated sections to a grounding network. Notably, these devices lack arc suppression capabilities and must only operate after circuit breakers have de-energized the load, classifying them as passive safety components. Compliant with IEC, ANSI, and other international standards, they are essential for isolating high-voltage substation equipment (e.g., circuit breakers, transformers) during maintenance, serving as a foundational safeguard for secure power system operations.