Thermal overload "RC Amp" ?

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Anatol

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I am, very slowly, restoring a Frejoth 12x36 gap bed lathe, probably around 30 years old. (Its almost identical to similar Grizzly, Enco, etc). The other (hot) day, while doing a lot of on/off, the thermal overload popped. A few days after I took a look in the electrical box and saw a unit with a white plastic 'blade' and a white plastic knob. I pushed the blade in (I think is the thermal reset) and it worked again :) The knob has 6 11 13 on it, and "RC Amp" see pic. I've searched but can't find an explanation of "RC Amp" Can someone enlighten me, and what should I set it at?
IMG_3236.jpg

thanks
A
 

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