A mechanical-type timer that changes state when control power is applied and reverts after a preset time is called what?

A mechanical-type timer that changes state when control power is applied and then reverts after a preset time is identified as an interval timer. This type of timer is designed to initiate an action immediately upon receiving power, and it will maintain that action for a predetermined duration before returning to its original state. The key characteristic here is the way the timer responds to the application of control power by executing a designated event for a specific interval.

In the context of timers, the interval timer plays a crucial role in applications where a delay in returning to the inactive state is necessary after the initial trigger. It operates by starting the timing process as soon as power is applied and only transitions back to the inactive state once the set time has elapsed. This facilitates various functions in electrical control systems where specific timing sequences are essential for proper operation.

Understanding the other types of timers can help clarify why the interval timer is the correct choice. An on-delay timer, for instance, would activate its output after a preset delay following the application of power, while off-delay timers trigger immediately but delay turning off after power is removed. Lastly, a recycle timer manages multiple cycles of on and off states, rather than simply timing a single interval. Each of these functions aligns with different control requirements, making