preset time period and when this time period is over the relay switch will become activated and switch ON the connected load.

Main component of the circuit is a 555 timer chip that is used to perform a timing task in the circuit. Increasing or decreasing the value of the 100uF capacitor can achieve the desired time delay. Any desired electronic appliance can be connected in the place of load; the relay switch value should be used according the appliance current consumption.

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This simple mains delay switch circuit can be used with the electronic appliances to give some delay before power ON to make them safe from sudden power shocks generated from short circuits or other electrical damages. When power is applied the timer will automatically starts for a
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Mains Delay Switch Circuit Diagram