What is this for? It doesn't cost much and I couldn't tell if it was a necessity or a bell/whistle so I have one. I suppose if one desires to do tweeking experiments to power-up the system this would be the yardstick but I'm not going to do that. My machine works fine for what I want to do and I say, "never trouble trouble till trouble troubles you."
On my power hammers I have have used Square D boxes with fuses but my electrical advisor suggested I try a circuit breaker type on this machine. What can I say? It works just fine like the other type did.