Thats what I did. I. I have a plug like that for our 5th wheel trailer. At first I bought a cheap $10 plug from Home Depot. That was a huge mistake. Not sure which outlet you put on there, but when I got the good one, I took some up close pics of it, and whoa, what a huge difference. Then it made sense why the cheap one was getting so hot - even though it was brand new. The pic below shows the quality one, and the cheap one. Both are new. The cheap one even had much less contact area with the prongs that go into it so it was a double whammy. If you're interested, the good one is a Hubbell 9450A. I dropped the pic of it below. Oh also, the terminals where the wires go in on the Hubbell (bottom pic) are of a much better design that doesn't crush the wires and spread them out like the cheap one. You can see that when it clamps them, its at an angle to keep the strands together which is nice. I just can't say enough about getting a quality outlet for something that moves such high current.
I would also recommend that you look up the torque ratings for the lugs on the breaker, as well as the back of this outlet. I usually never do that for fear of breaking something but I went exactly by the book this time and I found out that the terminals on the breaker weren't tight enough and the same on the outlet. That allowed me to get them tighter - and to spec without breaking them. All this helped with heat - the right torque on both ends of the wires, plus this quality outlet really helped. Thinking back, I couldn't believe how bad of quality that cheap outlet was.
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