Power Pulse

[BAddison1]

I need some expert advice. I’m currently working on a project with a 12v 7day 24hour timer and a mechanical 12v latch. I need the timer to trip the latch. The problem is once the timer trips it is in the on state for a minimum of 60 seconds. This will burn the latch. I need it to be on no longer than 3 seconds. Does anybody have any ideas what I can put between the two for this result?

[Robert_Fay]

I think what you need would be a one shot relay with a time delay function that could trip your latch. Maybe something like F10686-ND That way even with the long input signal you can still have the latch only receive power for a programmed (3 Sec) amount of time.

Here is a post that explains how they function.

Time Delay Relay Functions

Time relays and exactly how they function can get very confusing very quickly. Below is a very generalized chart of the differences between some of the more common functions of time delay relays. When looking at products, be sure to check out the datasheets as some of these might require consistent power along with the input or control contact. There also might be some slight variations as well, especially when you only have repeating functions like flashers and repeat cycles. [Time Delay Rela…

[BAddison1]

Thanks Robert I came to the same solution.
Brett

[RJFreeman]

If you are talking 12VDC then a sizeable Electrolytic capacitor will let a pulse through