Power Pulse

[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…