If a motor must start 15 seconds after the start switch is pressed, and a motor run light must come on when the start switch is pressed, then an on -delay type time delay relay must be used with one set of instantenous contacts.

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Quizplus · Accepted Answer

An on-delay time delay relay is designed to wait a specified amount of time (in this case, 15 seconds) after being energized before closing its contacts, allowing the motor to start after the delay. The instantaneous contacts would allow the motor run light to come on immediately when the start switch is pressed, without delay.

If a Motor Must Start 15 Seconds After the Start