30 minute timed relay

whats going to be the best option for this?

Are there any modules available that can do this?

Trigger will be negative momentary (150ma)

output will need to be 1amp 12v+

What kind of timing accuracy were you looking for on it?
If it's just an approximate time and doesn't have to be very precise you could use a analog timing circuit, otherwise a digital counter circuit might be used for better accuracy.

I bet there would be a home security module that would work with that length of time.  I don't believe I've ever seen a car product that will allow that long of a time.

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Kevin Pierson

Yeah, there are probably lots of home based timers that handle long duration times that run from AC power, but if it needs to be run off 12V, they would have to be modified.
Most automotive timer modules like the more familiar DEI 528T only go to 90 seconds. Not too many applications needing that long a delay, so it's not readily available premade.

If no one can come up with any sources for a commercial plug and play module, it should be relatively easy to DIY with a CMOS 555 timer with a larger cap/resistor combination to get the long delay times. Only thing is that the timing component values would need some experimentation to fine tune for accuracy, and 30 minute trial and error cycles might take a while to home in on the target time.

I've never seen a home security system that runs off of 120vac - most of them are 12 or 24vdc.  Now, I don't have one nor have I ever installed one, so maybe some 120vac systems exist.

I did a quick google search and found this:

https://www....com/p-423-elk-960-delay-timer-module.aspx

$26 and adjustable from 1 to 60 minutes.  Works with either 12 or 24vdc and can be triggered from (-) sources.  It doesn't say how big the relays are but I would expect them to be at least 10A.

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Kevin Pierson

Can we do a site search on this topic? this query came up about 3 months ago, also funnily enough from the UK and I found a UK supplier making relay/variable timer modules in the UK advertising on this site!

Unless that was a typo, the ELK-960 timer maxes out at 60 seconds, not minutes?

It wasn't home security systems I was referring to for the home based timers, but just general lighting timers. Those kinds of applications would be more likely to need long delay times, and not security functions. Crook would probably be long gone by the time the timer goes ding-

Maybe the UK timer modules that howie located would fit the bill-

According to that website "Setup is quick and easy with thumbwheel adjustment between 1 and 60 seconds. A quick jumper setting converts the time from seconds to minutes."

The jumper setting should make it easy to get to 30 mintues.

Lighting stuff would be 120vac, but security stuff not.  It seems like I have seen quite a bit of flexible security stuff that allows long delays.

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Kevin Pierson

Ah, missed that part about the jumper- should do the trick then.