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Thread: Dumb question: which PSU protection from high voltage on AC mains?

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    Quote Originally Posted by Per Hansson View Post
    Most decent power supplies will actually have a full range rating of 80v > 264v.
    You must ask yourself how this 400v will appear, because as you saw in my example linked in my previous post it's certainly possible.
    But then again how likely are you to encounter an electrical outlet where some muppet has wired it up with two live phases instead of live & neutral?

    Because if that is what you are trying to protect against then either my example or the one by ridgid13579 in post #18 will certainly work.
    Though I have my doubts about the response time of an arduino.
    We will after all want to switch off the output even before a full sine wave period has occured.
    Here is one implementation, to get rid of the voltage selector switch, it can't be used for 400v protection though but it's a good paper:

    http://www.st.com/content/ccc/resour...CD00003861.pdf

    But as others mentioned what you probably want it a whole house protector, failing that some easy to use device like this comes to mind:
    http://www.neopower.hk/Automatic-vol...cher(AVS).html
    You are correct about the arduino response time being a little.... slow - but if your code is rather efficient and is only a simple if statement, it should be in the microseconds for a response time. While it is perfectly true, the commercial ic/built ones will cut off power in a nanoseconds over milliseconds, your mov and inline filtering should easily absorb that small voltage spike before the relays kick in to shut it off.... Can always test the arduino response time with an oscilloscope.

    EDIT: with that ebay POS sensor, you measure it based on a sine wave as well, so if it passes a certain threshold, you can turn it off earlier... provided that op-amp does not have much of a delay

    In Canada here, 240v is supplied here with 2 live wires... But it's on it's own outlet, usually reserved for dryers (and soon for my server !)

    And yes, if you are getting random 400v spikes in your home, you'd want something that protects the whole home.
    Last edited by ridgid13579; 01-31-2017 at 07:58 PM.

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    Quote Originally Posted by Behemot View Post
    Or you have separate voltage trigger which than triggers what, according to dictionary, translates as "switch isolator". No idea if it's the right term, I only know some of the established name in czech. There are also some which are used with ordinary circuit breaker, as an add-on, it triggers the breaker mechanism.
    May you point out to some specific products you have there, Pavel? Translation to italian doesn't serve me well, when looking for actual devices.
    Best, Luca

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    Quote Originally Posted by Per Hansson View Post
    But as others mentioned what you probably want it a whole house protector, failing that some easy to use device like this comes to mind:
    http://www.neopower.hk/Automatic-vol...cher(AVS).html
    Thanks again Per.

    Thinking to the whole home protection (and so not of single devices), as far as you know are there products to be installed into the distribution board/breaker panel/electric panel which do the same? As for Pavel prior suggest ("switch isolators"), just translating "automatic voltage switcher" doesn't work well for my needs.
    Best, Luca

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    Found for example this one, labeled as true overvoltage trigger, which works in conjunction with their circuit breakers https://www.shopelektro.cz/jistice,-...tavitelne-meze

    Or Schneider https://www.elektrohadrava.cz/index....ec=SCHA9A26479

    Or you can use the simple voltage trigger itself. Now, this is meant for emergency shutdown, however, I think it may also be used as a protection. It triggers when about 70 % of rated voltage appears on its contacts. So for 400V when there is about 280 V it triggers and shuts down the circuit breaker.

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