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Switch That Turns on When Powered and Off When Powered Again

dullard
May 21, 2001
23,641
one,885
126
  • #ane
I'm looking for a power switch for a machine. For safety reasons, I'd like it to default to off anytime the power is cutting (say a power outage occurs). I've seen these things everywhere on machines that could be dangerous (like a table saw). That way when the power comes back on you might not take your hands in the way of the bract. Then of form there needs to be a button to button manually when you want to start the machine up again.

Edit for clarification: Ideally I'd like a pushbutton power switch (like on a computer). The user uses it to turn the automobile on/off. But the automobile defaults to off whenever ability is cut. Then the user needs to press the ability push again to turn information technology on.

Unfortunately I don't know where to look. I've tried google searches only I don't know the proper terminology to search for. I detect lots of links to switches that plow off when there is a key turned, a pressure mat stepped on, a light alter, a chain pulled, a door opened, etc - but non a single ane for when power is cut.

Practise whatever of you know where I can purchase a switch that does it, or a company that makes them, or a catalog that has them in it, or the proper words for a google search, an electrical forum where I could find a ameliorate answer, or even just a volume that discribes the terminology? Annihilation at all would be a corking assist.

  • #two
dullard--some circuit breakers practise this. My dad's woodworking shop is wired this way--when the power goes out, all the breakers are tripped. Yous might want to look into this area... as its not actually a "switch".

Sad I don't accept more than specific information.... I know how frustrating finding an obscure office can be! Skilful luck.

dullard
May 21, 2001
23,641
ane,885
126
  • #3
Originally posted past: HokieESM
dullard--some excursion breakers do this. My dad's woodworking shop is wired this way--when the power goes out, all the breakers are tripped. You might want to look into this area... as its non really a "switch".
That is one of the many "close" things I've plant. A $300 bulky circuit breaker is really overkill for my use. I've considered information technology, but I know there has to be a ameliorate solution since I've seen them all over the place.
FeathersMcGraw
  • #five
How about SKU # 454480 at homedepot;

<P course=tenbold>White 6-Side Outlet Wall Tap with Breaker for $4.97?

dullard
May 21, 2001
23,641
1,885
126
  • #six
Originally posted past: FeathersMcGraw
You want a relay.
I don't know much about electrical parts only, as I empathise it a relay is just a type of a switch. Put a voltage on one set of terminals and the other set up is opened/airtight depending on the relay. This is close to what I demand, simply I don't know of any relays that default to off and won't turn dorsum on until the user pushes a push button. Do you know of a specific relay that volition to that?

Edit for clarification: Ideally I'd like a pushbutton power switch (like on a computer). The user uses it to turn the machine on/off. But the machine defaults to off whenever power is cutting. Then the user needs to printing the power push button once again to turn information technology on.

White six-Side Outlet Wall Tap with Breaker for $4.97?
What exactly does that practise? I cannot tell from the website. Information technology is quite bulky though at eight"x5".
Demon-Xanth
  • #7
Information technology's basically a relayed switch, hardware stores have them for mounting on table saws and the like.

Harvey

Administrator<br>Aristocracy Member
  • #8
It would exist easy to design and build circuits to do this, and it sounds similar a expert safety feature, but I don't know if anyone makes a commercial production that does this.

The easiest circuit to build would include a separate "Start" button that required mechanical actuation after the ability switch was turned on so when power was restored later on an outage, the machine would not first again until the push button was pushed. Some other arroyo would be to add a logic circuit that controls a relay in the electric line. This circuit would be wired so that it could not piece of work unless the main power switch started in the "Off" position.

  • #9
You can construct this blazon of switch from a normally-open latching relay. Control the relay with a momentary pushbutton switch. Once airtight (ie. turned "on") the relay volition remain closed so long as power is practical. This ways you lot'll need a separate toggle switch to kill power to the machine when you want to plow it off. Prices for 120VAC latching relays range from around $20 to $60 depending on features, number of coils, etc. Make sure you pick a relay capable of handling the amount of voltage required by your device.

Yous tin also construct solid-state versions but a momentary switch + latching relay is probably the simplest way to practise information technology.

dullard
May 21, 2001
23,641
1,885
126
  • #10
It would be like shooting fish in a barrel to design and build circuits to do this, and it sounds similar a good prophylactic feature, but I don't know if anyone makes a commercial product that does this.
I would call up it would exist a very useful device for someone to brand... But I don't heed making information technology myself.
Originally posted by: arcas
Y'all can construct this type of switch from a normally-open up latching relay. Command the relay with a momentary pushbutton switch. In one case closed (ie. turned "on") the relay will remain closed so long as ability is applied. This means you lot'll need a dissever toggle switch to impale ability to the machine when y'all want to turn it off. Prices for 120VAC latching relays range from around $20 to $60 depending on features, number of coils, etc. Make sure you selection a relay capable of treatment the amount of voltage required by your device.

Y'all tin also construct solid-country versions merely a momentary switch + latching relay is probably the simplest way to do it.

Ok that sounds more similar what I need. If I empathize information technology you lot say there will be a 'main' on/off switch to command the ability to the auto. This electric current goes through a latching relay that is closed then current travels thorough. When power is cutting the 'principal' on/off switch will remain in the on position merely the relay will revert to its normally open position, therby cutting power to the machine. A momentary 'reset' push button tin be pressed to reset the latching relay back to the closed position. Is that what yous were talking about?
  • #11
Yes, exactly. The momentary pushbutton is a 'reset' push button which powers the relay long enough for it to latch airtight.

Fifty-fifty though it's a straightforward circuit to build, I'd still recommend ownership a pre-built commercial latching relay switch if you're going to use it with a machine that could kill/maim or if it requires a lot of ability. It gives you someone to blame other than yourself if it fails :)

  • #12
How about buying a SmartUPS. One time setup, The machine volition shutdown automatically when the power goes off and the battery is depression (only if y'all go a 'smartups'). If information technology's ATX and somewhat contempo, Yous can gear up the bios to not automatically turn on when the power comes back on (besides). That should effectively minimize downtime to poweroutages, unless you lot live somewhere they are constantly switching off power.
dullard
May 21, 2001
23,641
1,885
126
  • #thirteen
Originally posted by: arcas
I'd yet recommend buying a pre-built commercial latching relay switch if y'all're going to apply information technology with a machine that could kill/maim or if it requires a lot of power. It gives yous someone to blame other than yourself if information technology fails :)
The main result with my auto is that information technology will have dual 300 Westward heaters to estrus air running through them. If there is no air, the heaters overheat, bend out of shape, and somewhen could pose a pregnant problem. The heaters will be in their own insulated box, but you still don't desire a 600 Due west heater sitting on your desktop non-stop. I don't recollect it would maim or kill, just it is a potential hazzard. Practice you have any clue where I could go a prebuilt commecial latching relay switch?
Originally posted past: dman
How about buying a SmartUPS.
That would work, merely I didn't tell you plenty information. I'll be attaching a lot of other safety devices (the ability outage was just i case). Each of them volition be a relay that cuts the main power if at that place is a problem (such every bit the heaters overheat or the reckoner which the auto is continued to shuts off). So with only one main switch that stays off with the ability off, all these power cutting rubber devices volition work together flawlessly.

A UPS would take to be internal to the machine (which is possible merely is a nightmare to allow the user access to it). Or I'd demand an external UPS with an additional external box containing all the safety relays which is hooked up to the UPS which is hooked upwardly to the car which is hooked up to the safety relays all of which is hooked up to a figurer. And since I need the whole machine to be lightweight and portable, all these external boxes and wirings just won't exist practical. Plus the shear size of a UPS won't work well for a small portable machine.

  • #14
Off hand, I don't know of any commercial off-the-shelf versions though I'1000 sure yous can find them in electric-supply stores or carpentry tool stores. They might sell them equally "magnetic starters." If all you lot're doing is driving 600W worth of heaters (basically a resistive load), you lot shouldn't accept a problem and I'd exist tempted to simply build it myself. If you were controlling three stage motors or saws or something, I'd go commercial. Heck, you could probably scrounge one from an sometime apparel dryer :)
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Source: https://forums.anandtech.com/threads/switch-that-shuts-off-when-power-goes-out.1068822/