Schematic DIY KitTimers Basic building block of the circuitry
Hardly an industrial control does not need a timer. There are switch-on delay, bistable, nachtriggerbare, Programmable, and many more. They are used for example in star / delta start-up circuits, or as a follow-up control for a fan (toilet circuit) Here are some links to schematics with time relay

Here you will find Schematic Circuit Diagram for DIY and further information on Timers
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Simple ON delay timer

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