What is the role of a contactor in an aircraft system?

A contactor plays a crucial role in controlling the flow of electrical power within an aircraft system. It is an electromechanical switch that can connect or disconnect power from various components based on control signals. This capability is essential for managing electrical circuits, enabling the activation or deactivation of systems as needed.

In practical terms, the contactor ensures that power is sent to the necessary components when required while also providing a safe means of disconnecting circuits, which is especially important for maintenance and safety procedures. The ability to manage a high current flow efficiently makes contactors integral to many operational functions, including lighting, avionics, and other electrical systems in the aircraft.

The other choices address different functions that are not directly related to the primary role of a contactor. For instance, regulating voltage levels pertains more to devices like voltage regulators, converting DC to AC power involves inverters, and measuring current is a task typically handled by ammeters or current sensors, not a contactor.