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Old 04-23-2015, 03:03 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, 05:37 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, 06:19 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, 06:32 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, 06:41 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, 10:19 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, 03:15 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, 04:00 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, 04:28 PM   #9
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go to Lowes and get a Manuel timer
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Old 04-23-2015, 04:43 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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