lülitub

Lülitub refers to a specific Estonian verb form, not a standalone noun; it is the third-person singular present indicative form of the intransitive verb lülituma, meaning to switch on or to become turned on. In everyday language and technical writing, lülitub describes a subject reaching an active state, typically an electronic device, machine, or system.

In use, lülitub appears with direction or state markers such as sisse (on) or välja (off). Examples include: "Seade lülitub sisse automaatselt pärast toitenappi," or "Kaitse lülitub välja, kui lühis on tuvastatud." The form reflects a passive or intransitive action, indicating the subject is undergoing a state change rather than performing a deliberate action.

Lülitam, lülitus and related nouns refer to the act or process of switching; lülita is the imperative form meaning "turn on." The distinction between lülitub and lülitab is important: lülitub describes the device's own state change; lülitab is the active form used when a subject causes the switching.

In documentation and manuals, lülitub is common in declarative sentences describing system status, automation sequences, and fault responses. It can appear in forms like lülitub sisse, lülitub välja, or lülitub automaatselt, highlighting automatic activation.