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Miller 330 A/AB Welding Current Question

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  • Miller 330 A/AB Welding Current Question

    Why does the face plate state 300 amps welding current (max) and the selector handle claims the capability of 460 amps?

    What am I missing?

    (The manual also states 460.)
    Attached Files
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    Miller 211 MVP
    Hobart StickMate LX 235
    Lincoln AC 225
    CutMaster 42

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    • #3
      Yep. Have that doc. So?
      =======================
      Miller 211 AutoSet
      Miller Dynasty 200 DX
      Thermal Dynamics Cutmaster 42

      "The Sleep of Reason Produces Monsters"
      Francisco Goya

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      • #4
        300 amps is its rated current for a 60% duty cycle (can run for 6 minutes of every 10 minute without overheating). It can output all the way up to 460 amps, but will overheat if you try to run it more than a couple minutes (and the ambient temperature is about 104) in that 10 minute period. AC Tig tends to be the limiting mode for overheating the transformer. I have never AC Tig welded at 460 amps with a 50/50 DCEN/DCEP balance, but think either my hand or the sub panel breaker would give before the machine does...

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        • #5
          Originally posted by Thrutraffic View Post
          Why does the face plate state 300 amps welding current (max) ...
          Where are you seeing the word "max?"

          You are looking at the rated output.

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