Groups > sci.electronics.design > #489465

Re: AC switch fault current philosophy

From	Piglet <erichpwagner@hotmail.com>
Newsgroups	sci.electronics.design
Subject	Re: AC switch fault current philosophy
Date	2017-12-28 16:53 +0000
Organization	A noiseless patient Spider
Message-ID	<p237he$efh$1@dont-email.me> (permalink)
References	<p22o2k$svd$1@dont-email.me> <441d1598-6b12-4153-9185-cf8f25bdf975@googlegroups.com>

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On 28/12/2017 12:47, Phil Allison wrote:
> piglet squeeled :
>
> -----------------
>
>>
>>
>> When designing a semiconductor based switch for AC mains power which is
>> the better philosophy to handling a load side short circuit:
>>
>> 1. Use devices rugged enough to pass the fault current and allow the
>> upstream breaker or fuse to operate as usual if the switch had been
>> mechanical;
>>
>> 2. Switch off fast enough to break the current before damage occurs and
>> retry a second or two later?
>>
>>
>
> ** The proven way is to do both.
>
> 1.  Use a very rugged AC switch device, like a 40A triac or 60A SCR pair with the largest half cycle surge rating - like 500 to 1000A.
>
> 2. Install a fast acting magnetic breaker able to break the turn off arc in one or two milliseconds.
>
> If there are other good ways, designers of pro-lighting dimmer don't know about them.
>
> BTW:
>
> Stop posting fuckwit questions about stuff you are clueless about.
>
>
> .....  Phil
>
>
>
>
>
>
>
> ---
> This email has been checked for viruses by AVG.
> http://www.avg.com
>

Thanks Phil. Happy New Year

piglet

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Thread

AC switch fault current philosophy Piglet <erichpwagner@hotmail.com> - 2017-12-28 12:29 +0000
  Re: AC switch fault current philosophy Phil Allison <pallison49@gmail.com> - 2017-12-28 04:47 -0800
    Re: AC switch fault current philosophy Piglet <erichpwagner@hotmail.com> - 2017-12-28 16:53 +0000
    Re: AC switch fault current philosophy George Herold <gherold@teachspin.com> - 2017-12-28 13:16 -0800
      Re: AC switch fault current philosophy Phil Allison <pallison49@gmail.com> - 2017-12-28 16:51 -0800
  Re: AC switch fault current philosophy "Tim Williams" <tiwill@seventransistorlabs.com> - 2017-12-28 09:03 -0600
    Re: AC switch fault current philosophy Piglet <erichpwagner@hotmail.com> - 2017-12-28 17:00 +0000
      Re: AC switch fault current philosophy Piotr Wyderski <peter.pan@neverland.mil> - 2017-12-28 20:21 +0100
      Re: AC switch fault current philosophy Lasse Langwadt Christensen <langwadt@fonz.dk> - 2017-12-28 11:57 -0800
        Re: AC switch fault current philosophy Piglet <erichpwagner@hotmail.com> - 2017-12-29 12:45 +0000
          Re: AC switch fault current philosophy Winfield Hill <hill@rowland.harvard.edu> - 2017-12-29 05:13 -0800
          Re: AC switch fault current philosophy Piotr Wyderski <peter.pan@neverland.mil> - 2017-12-31 10:57 +0100
  Re: AC switch fault current philosophy Don Kuenz <g@crcomp.net> - 2017-12-28 18:45 +0000
    Re: AC switch fault current philosophy "Tim Williams" <tiwill@seventransistorlabs.com> - 2017-12-28 14:16 -0600
    Re: AC switch fault current philosophy pcdhobbs@gmail.com - 2017-12-28 12:27 -0800
      Re: AC switch fault current philosophy tabbypurr@gmail.com - 2017-12-28 13:16 -0800
        Re: AC switch fault current philosophy pcdhobbs@gmail.com - 2017-12-28 14:42 -0800
          Re: AC switch fault current philosophy tabbypurr@gmail.com - 2017-12-28 15:25 -0800
            Re: AC switch fault current philosophy pcdhobbs@gmail.com - 2017-12-28 19:04 -0800
              Re: AC switch fault current philosophy tabbypurr@gmail.com - 2017-12-29 06:20 -0800
              Re: AC switch fault current philosophy George Herold <gherold@teachspin.com> - 2017-12-29 15:48 -0800
                Re: AC switch fault current philosophy krw@notreal.com - 2017-12-29 18:59 -0500
                Re: AC switch fault current philosophy Phil Allison <pallison49@gmail.com> - 2017-12-29 17:03 -0800
                Re: AC switch fault current philosophy Lasse Langwadt Christensen <langwadt@fonz.dk> - 2017-12-30 07:49 -0800
                Re: AC switch fault current philosophy tabbypurr@gmail.com - 2017-12-29 19:47 -0800
                Re: AC switch fault current philosophy upsidedown@downunder.com - 2017-12-30 11:42 +0200
                Re: AC switch fault current philosophy Phil Allison <pallison49@gmail.com> - 2017-12-30 02:01 -0800
                Re: AC switch fault current philosophy upsidedown@downunder.com - 2017-12-30 22:12 +0200
                Re: AC switch fault current philosophy tabbypurr@gmail.com - 2017-12-30 15:20 -0800
                Re: AC switch fault current philosophy upsidedown@downunder.com - 2017-12-31 14:12 +0200
                Re: AC switch fault current philosophy Phil Allison <pallison49@gmail.com> - 2017-12-30 16:33 -0800
                Re: AC switch fault current philosophy Phil Allison <pallison49@gmail.com> - 2017-12-31 18:30 -0800
                Re: AC switch fault current philosophy ehsjr <ehsjr@verizon.net> - 2017-12-30 19:00 -0500
                Re: AC switch fault current philosophy Phil Allison <pallison49@gmail.com> - 2017-12-30 21:13 -0800
                Re: AC switch fault current philosophy upsidedown@downunder.com - 2017-12-31 14:36 +0200
                Re: AC switch fault current philosophy Phil Allison <pallison49@gmail.com> - 2017-12-31 04:47 -0800
                Re: AC switch fault current philosophy tabbypurr@gmail.com - 2017-12-31 06:00 -0800
                Re: AC switch fault current philosophy tabbypurr@gmail.com - 2017-12-31 17:39 -0800
                Re: AC switch fault current philosophy Jasen Betts <jasen@xnet.co.nz> - 2018-01-01 04:19 +0000
                Re: AC switch fault current philosophy tabbypurr@gmail.com - 2017-12-31 21:38 -0800
                Re: AC switch fault current philosophy tabbypurr@gmail.com - 2017-12-31 05:54 -0800
              Re: AC switch fault current philosophy Piotr Wyderski <peter.pan@neverland.mil> - 2017-12-31 11:29 +0100
            Re: AC switch fault current philosophy ehsjr <ehsjr@verizon.net> - 2017-12-30 19:44 -0500
              Re: AC switch fault current philosophy Phil Allison <pallison49@gmail.com> - 2017-12-30 16:52 -0800
                Re: AC switch fault current philosophy ehsjr <ehsjr@verizon.net> - 2017-12-30 23:14 -0500
                Re: AC switch fault current philosophy Phil Allison <pallison49@gmail.com> - 2017-12-30 20:33 -0800
              Re: AC switch fault current philosophy tabbypurr@gmail.com - 2017-12-31 05:51 -0800
      Re: AC switch fault current philosophy Don Kuenz <g@crcomp.net> - 2017-12-29 14:19 +0000
      Re: AC switch fault current philosophy glen walpert <nospam@null.void> - 2017-12-29 16:03 +0000
      Re: AC switch fault current philosophy "Paul Hovnanian P.E." <paul@hovnanian.com> - 2017-12-29 20:01 -0800
        Re: AC switch fault current philosophy Michael A Terrell <mike.terrell@earthlink.net> - 2017-12-29 23:49 -0500
  Re: AC switch fault current philosophy Jim Thompson <To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> - 2017-12-28 12:48 -0700
  Re: AC switch fault current philosophy George Herold <gherold@teachspin.com> - 2017-12-28 13:28 -0800

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