Meaning of one simbol in schematic

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  • harp
    Badcaps Veteran
    • Jun 2022
    • 598
    • Planet Earth

    #1

    Meaning of one simbol in schematic

    please tell me what means simbol with curved arc (like headphones) on shematic? Why is there and can it be omitted?

    Also, I wish to build device like that, with isolation transformer and variac, so seek to achieve a expert tip about that, maybe schematic with some genius feature (some switches, lights, etc...) on it that work wery well in practice. I see few videos where sugested only that ground is not connected, nothing else about featured and usefull control.
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  • stj
    Great Sage 齊天大聖
    • Dec 2009
    • 30997
    • Albion

    #2
    Re: Meaning of one simbol in schematic

    it indicates a link between 2 points or a removable connection.
    very strange to find it printed on the front of something though.

    Comment

    • redwire
      Badcaps Legend
      • Dec 2010
      • 3906
      • Canada

      #3
      Re: Meaning of one simbol in schematic

      The symbol is for a circuit breaker. So there are two plus a fuse for the variac's protection. I think it's a thermal circuit breaker, so the curved element heats up and pops up.

      Comment

      • stj
        Great Sage 齊天大聖
        • Dec 2009
        • 30997
        • Albion

        #4
        Re: Meaning of one simbol in schematic

        i would put a switch on the ground connection.
        sometimes it's good, but if you connect something that has an earth-bonded psu then it can partly bypass the isolation

        Comment

        • redwire
          Badcaps Legend
          • Dec 2010
          • 3906
          • Canada

          #5
          Re: Meaning of one simbol in schematic

          With an isolation transformer, do not ground one (output) leg or it defeats the entire purpose of using one, it is no longer isolating pri-sec.
          I can't think of when you need to ground an isolation transformer's output.

          People misinterpret electrical safety codes which want all (mains) power transformer's secondary grounded to make a neutral.

          Comment

          • eccerr0r
            Solder Sloth
            • Nov 2012
            • 8701
            • USA

            #6
            Re: Meaning of one simbol in schematic

            WTF that schematic is really wrong. That has a variable resistor there instead of a true variac... So while that is a circuit breaker, take the schematic with a grain of salt.

            Comment

            • harp
              Badcaps Veteran
              • Jun 2022
              • 598
              • Planet Earth

              #7
              Re: Meaning of one simbol in schematic

              Oh, I forgot all to thank you!

              Comment

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