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Old 04-23-2015, 02:03 AM   #1
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looking for a timed switch (manually turn on, auto turn off after 1-60 minutes)

i am looking for a 12 volt switch that is also a timer (manually turn on, then time out and open the circuit after 1-60 minutes). something similar to what you'd find in a house for an exhaust fan. i have found hundreds of them rated for AC applications. i cannot seem to find anything BASIC for dc applications. i dont want/need a fancy, programmable unit that consumes power to keep its memory.....i just want simple. my budget is $50


i know these are alot less than $50, but something like this for DC applications would be perfect. the smaller the better.


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Old 04-23-2015, 04:37 AM   #2
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i am looking for a 12 volt switch that is also a timer (manually turn on, then time out and open the circuit after 1-60 minutes). something similar to what you'd find in a house for an exhaust fan. i have found hundreds of them rated for AC applications. i cannot seem to find anything BASIC for dc applications. i dont want/need a fancy, programmable unit that consumes power to keep its memory.....i just want simple. my budget is $50


i know these are alot less than $50, but something like this for DC applications would be perfect. the smaller the better.


IF that is a wind up switch, you can use it for 12v. The switch doesn't know if your passing 12v or 110v, as long as you do not need 110v for the switch operation. All it really going to do is open or close a circuit don't know why you couldn't use that. Just break the hot leg only. Give it a try on something and test it.
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Old 04-23-2015, 05:19 AM   #3
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How much DC current will be going through the timer, as it is harder to interrupt than AC current without doing damage to the internal contacts.....?
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Old 04-23-2015, 05:32 AM   #4
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spec sheet says 1.2 amp............so not much at all. i can use a relay if that would help any.
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Old 04-23-2015, 05:41 AM   #5
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spec sheet says 1.2 amp............so not much at all. i can use a relay if that would help any.
The type of timer shown above are usually good for 15 amps at 120 volts AC, so it will be OK to interrupt 1.2 amps at 12 volt DC.

Just as an example, here is a micro-switch rating: it is rated for 15 amps at 125 volts AC but only 1/2 amp at 125 volts DC........
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Old 04-23-2015, 09:19 AM   #6
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spec sheet says 1.2 amp............so not much at all. i can use a relay if that would help any.
What do you want to put it on or control if I may ask?
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Old 04-23-2015, 02:15 PM   #7
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Majority of cases you can use an AC switch for DC but not the reverse.....You have to read the specs stamped on the unit.........J
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Old 04-23-2015, 03:00 PM   #8
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Majority of cases you can use an AC switch for DC but not the reverse.....You have to read the specs stamped on the unit.........J
I think it's the opposite.....?

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Old 04-23-2015, 03:28 PM   #9
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go to Lowes and get a Manuel timer
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Old 04-23-2015, 03:43 PM   #10
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go to Lowes and get a Manuel timer
I think that is a manual timer he has, Just has a wind up timer. The timer only completes a circuit. OP also stated that the DC amp draw is only 1.2, What fonzie y tube showed a 220v heating coil is what it looked like to me. But I could be wrong. Just get a 12 volt computer fan tie it in and try the timer.
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Old 04-23-2015, 03:47 PM   #11
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12v timer - Newegg.com

How about one of these??
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Old 04-23-2015, 04:18 PM   #12
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12v timer - Newegg.com

How about one of these??
That's a good site I just checked it out and bookmarked it THANKS....
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Old 04-26-2015, 10:02 AM   #13
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Originally Posted by gljurczyk View Post
IF that is a wind up switch, you can use it for 12v. The switch doesn't know if your passing 12v or 110v,
You are 100% correct. I'd use that rotary switch.
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Old 04-26-2015, 10:10 AM   #14
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Still nothing from OP as to what he wants to control. A simple 110v timer switch from Lowes/HD might be just the answer.
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Old 04-26-2015, 10:25 AM   #15
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OC, OP said:
Quote:
Originally Posted by Bocephus View Post
I am looking for a 12 volt switch that is also a timer (manually turn on, then time out and open the circuit after 1-60 minutes).
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Old 04-26-2015, 10:47 AM   #16
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OC, OP said:
Still doesn't tell us what he wants to control. i.e. lights, fan, etc.
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Old 04-26-2015, 11:01 AM   #17
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Still doesn't tell us what he wants to control. i.e. lights, fan, etc.
I asked him the same question at post#6, all he said that specks said it pulled 1.2 amps DC can't be much but lights or something. Oh he did say he has a $50.00 budget....He said he wanted it simple like the wind up he shown with a 0 to 60 min. timer only. Maybe he figured it out already and like so many others never let folks know. And we are like cattle just keep answering them with idea's....
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Old 05-01-2015, 08:22 PM   #18
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Quote:
Originally Posted by Bocephus View Post
i am looking for a 12 volt switch that is also a timer (manually turn on, then time out and open the circuit after 1-60 minutes). something similar to what you'd find in a house for an exhaust fan. i have found hundreds of them rated for AC applications. i cannot seem to find anything BASIC for dc applications. i dont want/need a fancy, programmable unit that consumes power to keep its memory.....i just want simple. my budget is $50


i know these are alot less than $50, but something like this for DC applications would be perfect. the smaller the better.


Not quite $50.00 but, this will do what you're asking
(have a programmable timer) & much more.....not all info. is on the site but a ph. call will get all.....I can't take credit for this find; "Old Coot" here on our forums put me on to this product.....can't thank him enough!.....I am using two of these systems in my TT.....one of them as "3/way"......these RX's (switchs) can be "Taught" to listen to something like 30 different "TX's" (wall mounted push/buttons).....you can control a circuit from 30 different locations!.....FWIW
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Old 05-02-2015, 03:39 PM   #19
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Originally Posted by Jim in Halifax View Post
Majority of cases you can use an AC switch for DC but not the reverse.....You have to read the specs stamped on the unit.........J
I have used AC switches for DC applications with no probs!!!!!!!!!!!! J
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Old 05-16-2015, 03:22 AM   #20
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well, the common household timer switch works like a charm guys. thanks for the help. i am using it for a fuel transfer pump going from the auxiliary tank in my bed of my pickup to the main tank. i wanted it on a timer so i wouldnt forget the pump on.
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