Time Delay Relay


Posted on Dec 19, 2012

A time delay relay is a relay that stays on for a certain amount of time once activated. This time delay relay is made up of a simple adjustable timer circuit which controls the actual relay. The time is adjustable from 0 to about 20 seconds with the parts specified. The current capacity of the circuit is only limited by what kind of relay you decide to use.


Time Delay Relay
Click here to download the full size of the above Circuit.

# R1 adjusts the on time. # You can use a different capacitor for C1 to change the maximum on time. # S1 is used to activate the timing cycle. S1 can be replaced by a NPN transistor so that the circuit may be triggered by a computer, other circuit,




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