Electrical – latching with a timed relay


I am an ultra newbie, so please excuse my design/drawing here and I am sure my terms are not correct, but I want to learn. Here is what I am trying to do and a diagram. I think I got it right, but would love some advice.

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Object: To turn on a light and have it turn off automatically after a period of time by a time delay relay.

Ground: Power Source Negative (green) to negative on relay. Lights Negative to negative on relay.

Power: Power Source Positive (red) to positive on relay through a button. Jumper from positive on relay to common on relay.

Button: Momentary Push Button making the initial connection.

Lights: Positive on lights (red) connected to first terminal on time delay relay. After an amount of time, this terminal is switched off and it defaults to turning on terminal 2 which will not be used.

Latching: Both connectors on momentary push button (blue) latched to terminal 1. This is to create a by-pass creating a latched connection to allow the lights to remain on even though the momentary push button is released breaking the initial connection.

Relay Reset: Once terminal 1 is turned off, it will sever the latched connection, thus removing all power from the relay resetting it.

My Biggest Questions is, "is the latching going to work when I release the momentary push button and will it shut off power to the relay once connection 1 is terminated once the time has expired??

Best Answer

I don't know if this helps, but if you are looking to turn on the lights for a few seconds to a few minutes, you could use the button to trigger a 555 timer circuit that drives the relay. This one will turn on the lights for about a second. Increase R4 or C2 to increase the delay; there's a chart in the data sheet that you can use to figure out the right values to use. R2 will depend on your relay.


simulate this circuit – Schematic created using CircuitLab