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Help needed electric kill switch for air compressor

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  • #31
    Originally posted by wmgeorge View Post
    So the simplest thing to do, since my circuit breaker panel is right by the door is just flip the breaker off on my way out for the night. I am assuming its a dedicated 120 or 240 circuit.
    Same here.
    Location: Saskatoon, Saskatchewan, Canada

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    • #32
      Do not count on an SSR for a shutoff. They are pretty reliable, but are not a "disconnect". Most solid state devices will fail shorted, which is the "on " condition. Not a UL disconnect, which normally involves an open switch.
      CNC machines only go through the motions

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      • #33
        Originally posted by wmgeorge View Post
        So the simplest thing to do, since my circuit breaker panel is right by the door is just flip the breaker off on my way out for the night. I am assuming its a dedicated 120 or 240 circuit.
        Two problems with this.
        First, I have a shut off switch on the compressor, but still walk out of the shop and forget that I turned it on and don't turn it off.
        Second, breakers are not designed to be used as switches, even though we all do it. Frequent turning them off and on can shorten their life.
        Peter
        Grantham, New Hampshire

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        • #34
          As everyone is going on about wiring switches in etc. , I suggest something simple. Put a small LED bulb in the shop that is on all night. That way she won't trip over anything when she turns the compressor off at 3:37am. She'll love it.

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          • #35
            I'm blown away. Fix your leaks! I go to Mexico 3 months out of the year and I close the ball valve on my compressor but otherwise leave it fully powered and ready to go. The pressure doesn't drop even 1 psi while I'm gone.

            In normal use I have 1 length of air hose connected, with a lever-action blowgun on the hose. That particular air gun doesn't leak. At all. Many other things I plug into air hoses have tiny leaks. But the compressor? No way.

            metalmagpie

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            • #36
              I don’t have any leaks except when I forget to unplug my Chinese tire machine. I hate leaks.

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              • #37
                While it won't shut down the compressor, there exist so-called "velocity fuses" that will stop airflow in the event of a cut, disconnected, or otherwise blown compressed air line. They won't do anything for small leaks or normal air usage, but if there's a gaping hole the fuse will shut off air on the downstream side. They are basically a check valve that shuts when the airflow past the valve becomes too much.

                Here's an example (I'm not specifically recommending this particular item or vendor, but this will give an idea of what I'm talking about): https://www.grainger.com/product/SPE...Air-Fuse-5ZL36

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                • #38
                  My compressor is 5Hp, 480 Volt 3-phase, and I have a good number of hoses, so some minor leaks. The compressor will run every 3 or 4 hours to refill the 40 gallon tank. As I have 120 volt controls, I put the switch and a regular industrial pilot light right next to the door of the shop. It's a convenient location, and I seldom miss it when I exit at night. It would be easy enough to use a contactor, switch, and pilot light for most any compressor.

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